Dr. Julian Kunkel

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E-mailjulian.kunkel@gwdg.de
PGP1468 1A86 A908 D77E B40F 45D6 2B15 73A5 9D39 A28E
AddressRZGö, Burckhardtweg 4, Georg-August Universität Göttingen, room 4.111
Telephone+49 551/39-30144

Biography

Dr. Kunkel is a Professor in High-Performance Computing at the University of Göttingen, a Deputy Head of the GWDG and group leader of the working group Computing. Previously, he was a Lecturer at the Computer Science Department at the University of Reading and a postdoc in the research department of the German Climate Computing Center (DKRZ).
He manages several research projects revolving around High-Performance Computing and particularly high-performance storage. Julian became interested in the topic of HPC storage in 2003, during his studies of computer science. Besides his main goal to provide efficient and performance-portable I/O, his HPC-related interests are data reduction techniques, performance analysis of parallel applications and parallel I/O, management of cluster systems, cost-efficiency considerations, and the software engineering of scientific software. Dr. Kunkel is a member of many international program committees, he is a founding member of the IO500 benchmarking effort, the Virtual Institute for I/O, and the HPC Certification Forum. He is committed to excellence in research and teaching.

Research Interests

  • Data-driven workflows
  • Parallel file systems
  • Application of machine learning methods
  • Performance portability
  • Data reduction techniques
  • Management of cluster systems
  • Performance analysis of parallel applications and parallel I/O
  • Software engineering of scientific software
  • Personalized teaching

Projects

Advisory roles

  • 2021, Chair of the steering committee, HPC Certification Forum
  • 2021, Member of the OSSG Committee, BCS Open Source Specialist Group
  • 2021, IO-500 steering committee, The Virtual Institute for IO
  • 2021, Steering committee member, ISC High Performance
  • 2020, Chair of the steering committee, HPC Certification Forum
  • 2020, Member of the OSSG Committee, BCS Open Source Specialist Group
  • 2020, IO-500 steering committee, The Virtual Institute for IO
  • 2020, Steering committee member, ISC High Performance
  • 2019, Chair of the steering committee, HPC Certification Forum
  • 2019, Member of the OSSG Committee, BCS Open Source Specialist Group
  • 2019, IO-500 steering committee, The Virtual Institute for IO
  • 2019, Student travel grant committee member, ISC High Performance
  • 2019, Steering committee member, ISC High Performance
  • 2018, Chair of the steering committee, HPC Certification Forum
  • 2018, Member of the OSSG Committee, BCS Open Source Specialist Group
  • 2018, IO-500 steering committee, The Virtual Institute for IO
  • 2018, Student travel grant committee member, ISC High Performance
  • 2018, Project poster chair, ISC High Performance
  • 2018, Advisory board member, International European Conference on Parallel and Distributed Computing (Europar)
  • 2018, Steering committee member, ISC High Performance
  • 2017, IO-500 steering committee,
  • 2017, Research publication chair, ISC High Performance
  • 2017, Track chair, Conference on Algorithms and Architectures for Parallel Processing (ICA3PP-2017), Software Systems and Programming Models track
  • 2017, Steering committee member, ISC High Performance
  • 2017, Project poster chair, ISC High Performance
  • 2017, Advisory board member, International European Conference on Parallel and Distributed Computing (Europar)
  • 2016, Research publication chair, ISC High Performance
  • 2016, Project proposal reviewer, Exascale Computing Project, Department of Energy
  • 2016, Steering committee member, ISC High Performance
  • 2016, Steering committee member, Exascale 10 initiative (EIOW, an EOFS workgroup)
  • 2015, Project proposal reviewer, Funding Opportunity Announcement, Storage Systems and Input/Output for Extreme Scale Science (DE-FOA-0001338), Department of Energy
  • 2015, Project proposal reviewer, Anwendungsorientierte HPC-Software für das Hoch- und Höchstleistungsrechnen in Wissenschaft und Wirtschaft, BMBF
  • 2015, Steering committee member, ISC High Performance
  • 2015, Co-chair for the research paper sessions, ISC High Performance
  • 2015, Research poster chair, ISC High Performance
  • 2015, Steering committee member, Exascale 10 initiative (EIOW, an EOFS workgroup)
  • 2014, Co-chair for the research paper sessions, International Supercomputing Conference (ISC)
  • 2014, Research poster chair, International Supercomputing Conference (ISC)
  • 2014, Steering committee member, Exascale 10 initiative (EIOW, an EOFS workgroup)
  • 2013, Co-chair for the research paper sessions, International Supercomputing Conference (ISC)
  • 2013, Steering committee member, Exascale 10 initiative (EIOW, an EOFS workgroup)
  • 2012, Co-chair for the research paper sessions, International Supercomputing Conference (ISC)
  • 2012, Steering committee member, Exascale 10 initiative (EIOW, an EOFS workgroup)
  • 2011, Co-chair for the research paper sessions, International Supercomputing Conference (ISC)
  • 2010, Co-chair for the research paper sessions, International Supercomputing Conference (ISC)

Editorial roles

  • 2017, High Performance Computing; ISC High Performance 2017 International Workshops, DRBSD, ExaComm, HCPM, HPC-IODC, IWOPH, IXPUG, P3MA, VHPC, Visualization at Scale, WOPSSS, Frankfurt, Germany, June 18-22, Revised Selected Papers; Julian Kunkel, Rio Yokota, Pavan Balaji, David Keyes; LNCS; vol 10524; Springer; ISBN: 978-3-319-67630-2; DOI
  • 2017, High Performance Computing; 32nd International Conference, ISC High Performance 2017, Frankfurt, Germany, June 18–22, 2017, Proceedings; Julian Kunkel, Rio Yokota, Pavan Balaji, David Keyes; LNCS; vol 10266; Springer; ISBN: 978-3-319-58667-0; DOI
  • 2016, High Performance Computing; ISC High Performance 2016 International Workshops, ExaComm, E-MuCoCoS, HPC-IODC, IXPUG, IWOPH, P^3MA, VHPC, WOPSSS, Frankfurt, Germany, June 19–23, 2016, Revised Selected Papers; Michaela Taufer, Bernd Mohr, Julian Kunkel; LNCS; vol 9945; Springer; ISBN: 978-3-319-46079-6; DOI
  • 2016, High Performance Computing; 31th International Conference, ISC High Performance 2016, Frankfurt, Germany, June 19-23; Julian Kunkel, Pavan Balaji, Jack Dongarra; LNCS; vol 9697; Springer; ISBN: 978-3-319-41321-1; DOI
  • 2015, High Performance Computing; 30th International Conference, ISC High Performance 2015, Frankfurt, Germany, July 12-16; Julian Kunkel, Thomas Ludwig; LNCS; vol 9137; Springer; ISBN: 978-3-319-20119-1; DOI
  • 2014, Supercomputing; 29th International Conference, ISC 2014, Leipzig, Germany, June 22-26, 2014. Proceedings; Julian Kunkel, Thomas Ludwig, Hans Meuer; LNCS; vol 8488; Springer; ISBN: 978-3-319-07518-1; DOI
  • 2013, Supercomputing; 28th International Supercomputing Conference, ISC 2013, Leipzig, Germany, June 16-20, 2013. Proceedings; Julian Kunkel, Thomas Ludwig, Hans Meuer; LNCS; vol 7905; Springer; ISBN: 978-3-642-38750-0; DOI
  • 2012-05-23, ISC’12 research paper sessions proceedings; Julian Kunkel, Thomas Ludwig, Hans Meuer; Computer Science - Research and Development; vol 28; Springer; DOI
  • 2011-04-15, ISC’11 research paper sessions proceedings; Julian Kunkel, Thomas Ludwig, Hans Meuer; Computer Science - Research and Development; vol 26; Springer; DOI

Programm committee membership

Journal review duties

  • 2021, Nature Computational Science
  • 2021, PeerJ Computer Science
  • 2021, Journal of Computer Science and Technology
  • 2020, MDPI Algorithms
  • 2021, Journal of Computer Science and Technology
  • 2020, MDPI Energies
  • 2020, SoftwareX
  • 2020, Transactions on Parallel and Distributed Systems
  • 2020, IEEE Letters of the Computer Society
  • 2020, IEEE Access
  • 2020, MDPI Journal Applied Sciences
  • 2020, Journal of Computer Science and Technology (JCST)
  • 2019, Transactions on Parallel and Distributed Systems
  • 2019, IEEE Transactions on Big Data
  • 2019, MDPI Journal Sensors
  • 2019, MDPI Journal Symmetry
  • 2019, Supercomputer Frontiers and Innovations
  • 2019, MDPI Journal Future Internet
  • 2018, International Journal of Systems Science
  • 2018, MDPI Journal Sensors
  • 2018, IEEE Letters of the Computer Society
  • 2018, MDPI Journal Future Internet
  • 2017, Journal of Computer Science and Technology (JCST)
  • 2017, Elsevier Journal of Future Generation Computer Systems
  • 2017, ACM Journal of Computing Surveys
  • 2017, Journal Software: Practice and Experience
  • 2016, Journal Symmetry (MDPI – Open Access Publishing)
  • 2016, Journal of Computer Science and Technology (JCST)
  • 2016, Journal Transactions on Storage
  • 2016, Journal Future Generation Computer Systems
  • 2016, International Journal of High Performance Computing Application (IJHPCA)
  • 2015, Journal of Computer Science and Technology (JCST)
  • 2014, International Journal of High Performance Computing Application (IJHPCA)

Event organization

Other responsibilities

  • 2018–2019, Member of the procurement team for the HLRE4, Preparation of I/O-benchmarks and contributions to the procurement white paper, DKRZ, Germany
  • 2018, Member of the benchmarking team for the procurement of Archer2, Preparation of I/O-benchmarks, UKRI, UK
  • 2018–2019, Strategic Infrastructure Development (SID) of the Department, Department of Computer Science, University of Reading
  • 2018–2019, Establishment of a Computer Science Museum, Department of Computer Science, University of Reading
  • 2016–2019, Web-page development, migration and maintenance, The European Open File System (EOFS), https://www.eofs.eu
  • 2015, Founder, web-page development, The Virtual Institute for I/O, https://vi4io.org
  • 2015–2017, Member of the monitoring group, Development of the next-generation monitoring system for our new supercomputer, DKRZ
  • 2013–2016, Web-page development and maintenance, Exascale 10 (E10), http://www.exascale10.com
  • 2012–2015, Organization, Special Interest Group I/O in earth-system models. DKRZ
  • 2012–2013, Member of the procurement team for the HLRE3, Visits of vendors/integrators, preparation of I/O-benchmarks and procurement white paper, DKRZ
  • 2012, Member of the document management team, Goal: Aquisition of a DMS, DKRZ
  • 2009–2017, Organization, Regular seminar for information exchange, DKRZ
  • 2009–2013, Web-page development, structure and dynamic content with XML, Research Group: Scientific Computing, Universität Hamburg, http://www.wr.informatik.uni-hamburg.de/
  • 2007–2009, Development, Interactive screening analysis platform with SQL. Bioquant, University of Heidelberg

Teaching

Autumn Term 2024

Summer Term 2024

Autumn Term 2023

Summer Term 2023

Autumn Term 2022

Summer Term 2022

Autumn Term 2021

Autumn Term 2020

Spring Term 2020

Autumn Term 2019

Spring Term 2019

Autumn Term 2018

Summer Term 2018

Wintersemester 2017/2018

Sommersemester 2017

Wintersemester 2016/2017

Sommersemester 2016

Wintersemester 2015/2016

Sommersemester 2015

Wintersemester 2014/2015

Sommersemester 2014

Wintersemester 2013/2014

Sommersemester 2013

Wintersemester 2012/2013

Sommersemester 2012

Wintersemester 2011/2012

Sommersemester 2011

Wintersemester 2010/2011

Sommersemester 2010

Wintersemester 2009/2010

Sommersemester 2009

Wintersemester 2008/2009

Sommersemester 2008

Wintersemester 2007/2008

  • Seminar „Fortgeschrittene Fragestellungen zu parallelen und verteilten Dateisystemen“ (Contact: Dr. Julian Kunkel)

Open Thesis Topics

Hardening OpenStack environments for customersApply

Objective: The objective of this thesis is to develop and evaluate methods and tools to harden OpenStack environments for customers and improve their security. Tasks: Vulnerability analysis: Perform a detailed analysis of OpenStack environments to identify open ports, unused services and other potential vulnerabilities. This can be done with tools such as Nmap, Nessus or OpenVAS. Automatic detection of security vulnerabilities: Development of an automated process for the detection of security vulnerabilities in OpenStack environments. This can be done by using tools such as Ansible, SaltStack or Puppet. Wazuh for CVE detection: Integration of Wazuh, an open source security information and event management system (SIEM), into the OpenStack environment to detect Common Vulnerabilities and Exposures (CVEs) to track common vulnerabilities and exposures. Hardening of OpenStack components: Perform hardening measures for OpenStack components such as Nova, Neutron, Cinder and Keystone to improve their security. Security policy development: Develop security policies and procedures for security policies and procedures for the OpenStack environment to ensure that all security measures are implemented consistently and effectively. Methodology: Literature review: Conduct a comprehensive literature review on OpenStack security, hardening and CVE detection. Experimental work: Conducting experiments and tests in a lab environment to evaluate the developed methods and tools. Case study: Performing a case study in a real OpenStack environment to demonstrate the practicability of the developed methods and tools.

Julian Kunkel OpenStackSecurity

Theses

  • Simulation of Parallel Programs on Application and System Level, Julian Kunkel (PhD Thesis), Advisors: Thomas Ludwig, 2013-07-30, Thesis BibTeX URL
  • Towards Automatic Load Balancing of a Parallel File System with Subfile Based Migration, Julian Kunkel (Master's Thesis), Advisors: Thomas Ludwig, 2007-08-02, Thesis BibTeX URL
  • Performance Analysis of the PVFS2 Persistency Layer, Julian Kunkel (Bachelor's Thesis), Advisors: Thomas Ludwig, 2006-02-15, Thesis BibTeX URL

Publications

2024

  • Scalable Software Distribution for HPC-Systems Using MPI-Based File Systems in User Space (Jakob Dieterle, Hendrik Nolte, Julian Kunkel), pp. 14-20, SCALABILITY 2024, Valencia, Spain, ISBN: 978-1-68558-216-6, 2024-11-17 BibTeX URL
  • A Quantitative and Qualitative Comparison of Machine Learning Inference Frameworks (Egi Brako, Jonathan Decker, Julian Kunkel), pp. 7 to 13, SCALABILITY 2024, Valencia, Spain, ISBN: 978-1-68558-216-6, 2024-11-17 BibTeX URL
  • Poster: Predictive Maintenance in Server Farms with Time Series Analysis (Michael Bidollahkhani, Julian Kunkel), 2nd NHRConference 2024 at NHR4CES@TUDarmstadt, Darmstadt, Germany, 2024-09-09 BibTeX URL PDF
  • Chat AI: A Seamless Slurm-Native Solution for HPC-Based Services (Ali Doosthosseini, Jonathan Decker, Hendrik Nolte, Julian Kunkel), 2024-08-02 BibTeX URL DOI
  • HOSHMAND: Accelerated AI-Driven Scheduler Emulating Conventional Task Distribution Techniques for Cloud Workloads (Michael Bidollahkhani, Aasish Kumar Sharma, Julian Kunkel), IEEE Computers, Software, and Applications Conference, pp. 1-8, IEEE, IEEE, COMPSAC 2024, 2024-07 BibTeX
  • Poster: Deployment of an HPC-Accelerated Research Data Management System: Exemplary Workflow in HeartAndBrain Study (V. Telzki, H. tom Wörden, F. Spreckelsen, Hendrik Nolte, Julian Kunkel, U. Parlitz, S. Luther, M. Uecker, M. Bähr), Biosignals Workshop, Göttingen, 2024-02-29 BibTeX URL PDF
  • Interactive and Urgent HPC: Challenges and Opportunities (Albert Reuther, Nick Brown, William Arndt, Johannes Blaschke, Christian Boehme, Antony Chazapis, Bjoern Enders, Robert Henschel, Julian Kunkel, Maxime Martinasso), 2024-01-25 BibTeX URL DOI
  • The Intraday Dynamics Predictor: A TrioFlow Fusion of Convolutional Layers and Gated Recurrent Units for High-Frequency Price Movement Forecasting (Ilia Zaznov, Julian Kunkel, Atta Badii, Alfonso Dufour), In Applied Sciences, ISSN: 2076-3417, 2024 BibTeX URL DOI
  • Interactive and Urgent HPC: Challenges and Opportunities (Albert Reuther, Nick Brown, William Arndt, Johannes Blaschke, Christian Boehme, Antony Chazapis, Bjoern Enders, Robert Henschel, Julian Kunkel, Maxime Martinasso), 2024 BibTeX URL
  • Comparing Fault-tolerance in Kubernetes and Slurm in HPC Infrastructure (Mirac Aydin, Michael Bidollahkhani, Julian Kunkel), Proceedings of the 18th International Conference on Advanced Computing (ADVCOMP 2024), pp. 40-49, Venice, Italy, ISSN: 2308-4499. ISBN: 978-1-68558-184-8, 2024 BibTeX URL
  • Revolutionizing system reliability: The role of AI in predictive maintenance strategies (Michael Bidollahkhani, Julian Kunkel), IARIA CloudComputing 2024 Conference, pp. 1-9, Venice, Italy, ISSN: 2308-4294. ISBN: 978-1-68558-156-5, 2024 BibTeX URL

2023

  • Poster: Transfer Learning Workflow for High-Quality I/O Bandwidth Prediction with Limited Data (Dmytro Povaliaiev, Radita Liem, Julian Kunkel, Jay Lofstead, Philip Carns), SC 2023, Denver, Colorado, USA, 2023-11-12 BibTeX URL PDF
  • Mango-IO: I/O Metrics Consistency Analysis (Radita Liem, Sebastian Oeste, Jay Lofstead, Julian Kunkel), IEEE International Conference on Cluster Computing Workshops (CLUSTER Workshops) (2023), IEEE, Santa Fe, NM, USA, 2023-10-31 BibTeX URL DOI
  • TCDetect: A New Method of Detecting the Presence of Tropical Cyclones Using Deep Learning (Daniel Galea, Julian Kunkel, Bryan N. Lawrence), In American Meteorological Society (AMS), 2023-07-01 BibTeX URL DOI
  • Governance-Centric Paradigm: Overcoming the Information Gap between Users and Systems by Enforcing Data Management Plans on HPC-Systems (Hendrik Nolte, Julian Kunkel), INFOCOMP (13), pp. 13–20, INFOCOMP, INFOCOMP, ISBN: 978-1-68558-073-5, 2023-06-26 BibTeX URL PDF
  • DECICE: Device-Edge-Cloud Intelligent Collaboration Framework (Julian Kunkel, Christian Boehme, Jonathan Decker, Fabrizio Magugliani, Dirk Pleiter, Bastian Koller, Karthee Sivalingam, Sabri Pllana, Alexander Nikolov, Mujdat Soyturk, Christian Racca, Andrea Bartolini), ACM, Computing Frontiers, ISBN: 979-8-4007-0140-5/23/05, 2023-05-09 BibTeX DOI PDF
  • Secure HPC: A Workflow Providing a Secure Partition on an HPC System (Hendrik Nolte, Nicolai Spicher, Andrew Russel, Tim Ehlers, Sebastian Krey, Dagmar Krefting, Julian Kunkel), In Future Generation Computer Systems (141), pp. 677–691, 2023-04-01 BibTeX URL DOI PDF

2022

  • Secure Authorization for RESTful HPC Access (Mohammad Hossein Biniaz, Sven Bingert, Christian Köhler, Hendrik Nolte, Julian Kunkel), INFOCOMP 2022, The Twelfth Internation Conference on Advanced Communications and Computation (12), pp. 12–17, INFOCOMP, INFOCOMP, ISBN: 978-1-61208-961-4, 2022-06-26 BibTeX PDF
  • Performance Evaluation of Open-Source Serverless Platforms for Kubernetes (Jonathan Decker, Piotr Kasprzak, Julian Kunkel), In Algorithms, MDPI, ISSN: 1999-4893, 2022-06-02 BibTeX URL DOI PDF
  • Road Intersection Coordination Scheme for Mixed Traffic (Human-Driven and Driverless Vehicles): A Systematic Review (Ekene F. Ozioko, Julian Kunkel, Frederic Stahl), In Journal of Advanced Transportation, Hindawi, 2022-05-30 BibTeX DOI PDF
  • Improve the Deep Learning Models in Forestry Based on Explanations and Expertise (Ximeng Cheng, Ali Doosthosseini, Julian Kunkel), In Frontiers in Plant Science, Schloss Dagstuhl – Leibniz-Zentrum für Informatik, ISSN: 1664-462X, 2022-05-19 BibTeX URL DOI PDF
  • A Secure Workflow for Shared HPC Systems (Hendrik Nolte, Simon Hernan Sarmiento Sabater, Tim Ehlers, Julian Kunkel), In 2022 22nd IEEE International Symposium on Cluster, Cloud and Internet Computing (CCGrid), 2022 22nd IEEE International Symposium on Cluster, Cloud and Internet Computing (CCGrid) (22), pp. 965–974, IEEE, IEEE, CCGrid, 2022-05 BibTeX URL DOI PDF
  • Predicting Stock Price Changes Based on the Limit Order Book: A Survey (Ilia Zaznov, Julian Kunkel, Alfonso Dufour, Atta Badii), In Mathematics, Series: 1234, MDPI, ISSN: 2227-7390, 2022-04-09 BibTeX URL DOI PDF
  • Assessing IO500 Benchmark for Performance Engineering Guidance (Radita Liem, Geral Lofstead, Julian Kunkel), USDOE National Nuclear Security Administration (NNSA), Sandia National Lab. (SNL-NM), Albuquerque, NM (United States), SNL-NM, United States, 2022-02-01 BibTeX URL DOI

2021

  • User-Centric System Fault Identification Using IO500 Benchmark (Radita Liem, Dmytro Povaliaiev, Jay Lofstead, Julian Kunkel, Christian Terboven), In In 2021 IEEE/ACM Sixth International Parallel Data Systems Workshop (PDSW), pp. 35-40, IEEE, International Parallel Data Systems Workshop (PDSW), St. Louis, 2021-12-20 BibTeX URL DOI PDF
  • Toward a Workflow for Identifying Jobs with Similar I/O Behavior Utilizing Time Series Analysis (Julian Kunkel, Eugen Betke), In High Performance Computing: ISC High Performance 2021 International Workshops, Revised Selected Papers, Lecture Notes in Computer Science (12761), pp. 161–173, Springer, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-90539-2, 2021-11-13 BibTeX DOI PDF
  • Understanding I/O Behavior in Scientific and Data-Intensive Computing (Dagstuhl Seminar 21332) (Philip Carns, Julian Kunkel, Kathryn Mohror, Martin Schulz), In Dagstuhl Reports, pp. 16–75, Schloss Dagstuhl – Leibniz-Zentrum für Informatik, ISSN: 2192-5283, 2021-09-14 BibTeX URL DOI PDF
  • Analyzing the Performance of the S3 Object Storage API for HPC Workloads (Frank Gadban, Julian Kunkel), In Applied Sciences, Series: 11, MDPI, 2021-09-14 BibTeX URL DOI PDF
  • A Workflow for Identifying Jobs with Similar I/O Behavior Utilizing Time Series Analysis (Julian Kunkel, Eugen Betke), In The Journal of High-Performance Storage, Series: 2, VI4IO, ISSN: 2748-7814, 2021-08-09 BibTeX URL DOI PDF
  • Classifying Temporal Characteristics of Job I/O Using Machine Learning Techniques (Eugen Betke, Julian Kunkel), In The Journal of High-Performance Storage, Series: 1, VI4IO, ISSN: 2748-7814, 2021-01-29 BibTeX URL DOI PDF

2020

  • Investigating the Overhead of the REST Protocol to Reveal the Potential for Using Cloud Services for HPC Storage (Frank Gadban, Julian Kunkel, Thomas Ludwig), In High Performance Computing: ISC High Performance 2020 International Workshops, Revised Selected Papers, Lecture Notes in Computer Science (12321), pp. 161-176, (Editors: Heike Jagode, Hartwig Anzt, Dr. Guido Juckeland, Hatem Ltaief), Springer, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-59851-8, ISSN: 1611-3349, 2020-10-20 BibTeX DOI PDF
  • The Importance of Temporal Behavior when Classifying Job IO Patterns Using Machine Learning Techniques (Eugen Betke, Julian Kunkel), In High Performance Computing: ISC High Performance 2020 International Workshops, Revised Selected Papers, Lecture Notes in Computer Science (12321), pp. 191-205, (Editors: Heike Jagode, Hartwig Anzt, Guido Juckeland, Hatem Ltaief), Springer, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-59851-8, ISSN: 1611-3349, 2020-10-20 BibTeX DOI PDF
  • AIMES: Advanced Computation and I/O Methods for Earth-System Simulations (Julian Kunkel, Nabeeh Jumah, Anastasiia Novikova, Thomas Ludwig, Hisashi Yashiro, Naoya Maruyama, Mohamed Wahib, John Thuburn), In Lecture Notes in Computer Science, Series: Volume 7, Number 2, pp. 61-102, (Editors: Hans-Joachim Bungartz, Severin Reiz, Benjamin Uekermann, Philipp Neumann, Wolfgang E. Nagel), Springer International Publishing, ISBN: 978-3-030-47956-5, ISSN: 2197-7100, 2020-07-31 BibTeX DOI PDF
  • The HPC Certification Forum: Toward a Globally Acknowledged HPC Certification (Julian Kunkel, Weronika Filinger, Christian Meesters, Anja Gerbes), In Computing in Science and Engineering, Series: Volume 22, Issue 4, pp. 110-114, IEEE, ISSN: 1558-366X, 2020-07 BibTeX URL DOI PDF
  • Semi-automatic Assessment of I/O Behavior by Inspecting the Individual Client-Node Timelines – An Explorative Study on 10^6 Jobs (Eugen Betke, Julian Kunkel), In High Performance Computing: ISC High Performance 2020, Lecture Notes in Computer Science, Springer, ISC HPC, Frankfurt, Germany, 2020-06 BibTeX PDF
  • Optimizing Memory Bandwidth Efficiency with User-Preferred Kernel Merge (Nabeeh Jumah, Julian Kunkel), In Euro-Par 2019: Parallel Processing Workshops, Lecture Notes in Computer Science (11997), pp. 69-81, (Editors: Ulrich Schwardmann, Christian Boehme, Dora B. Heras, Valeria Cardellini, Emmanuel Jeannot, Antonio Salis, Claudio Schifanella, Ravi Reddy Manumachu, Dieter Schwamborn, Laura Ricci, Oh Sangyoon, Thomas Gruber, Laura Antonelli, Stephen L. Scott), Springer, COLOC - Workshop on Data Locality, Göttingen, Germany, ISBN: 978-3-030-48340-1, ISSN: 1611-3349, 2020-05-29 BibTeX DOI PDF
  • Parallelization and I/O Performance Optimization of a Global Nonhydrostatic Dynamical Core using MPI (Tiejun Wang, Zhuang Liu, Julian Kunkel, Changming Zhao), In Computers, Materials and Continua, Series: Volume 63, Issue 3, pp. 1399-1413, Tech Science Press, ISSN: 1546-2226, 2020-04-30 BibTeX DOI PDF
  • High-Performance Techniques for Big Data Processing (Philipp Neumann, Julian Kunkel), In Knowledge Discovery in Big Data from Astronomy and Earth Observation (Petr Skoda, Fathalrahman Adam), pp. 137–158, Elsevier (3251 Riverport Lane, St. Louis, Missouri 63043), ISBN: 978-0-12-819154-5, 2020-04-10 BibTeX
  • Potential of I/O Aware Workflows in Climate and Weather (Julian Kunkel, Luciana Pedro), In Supercomputing Frontiers and Innovations, Series: Volume 7, Number 2, pp. 35-53, (Editors: Jack Dongarra, Vladimir Voevodin), Publishing Center of South Ural State University (454080, Lenin prospekt, 76, Chelyabinsk, Russia), ISSN: 2313-8734, 2020-04 BibTeX DOI PDF
  • Contributing HPC Skills to the HPC Certification Forum (Julian Kunkel, Kai Himstedt, Weronika Filinger, Jean-Thomas Acquaviva, Anja Gerbes, Lev Lafayette), In Journal of Computational Science Education, Series: Volume 11, Issue 1, pp. 106-107, (Editors: Steven I. Gordon), ISSN: 2153-4136, 2020-01 BibTeX URL DOI PDF
  • One Year HPC Certification Forum in Retrospective (Julian Kunkel, Jean-Thomas Acquaviva, Kai Himstedt, Weronika Filinger, Anja Gerbes, Lev Lafayette), In Journal of Computational Science Education, Series: Volume 11, Issue 1, pp. 29-35, (Editors: Steven I. Gordon), ISSN: 2153-4136, 2020-01 BibTeX URL DOI PDF

2019

  • Scalable Parallelization of Stencils using MODA (Nabeeh Jumah, Julian Kunkel), In High Performance Computing: ISC High Performance 2019 International Workshops, Frankfurt/Main, Germany, June 16-20, 2019, Revised Selected Papers, Lecture Notes in Computer Science (11887), pp. 142–154, (Editors: Michèle Weiland, Guido Juckeland, Sadaf Alam, Heike Jagode), Springer, P^3MA workshop, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-34356-9, ISSN: 1611-3349, 2019-12-03 BibTeX URL DOI PDF
  • Footprinting Parallel I/O – Machine Learning to Classify Application’s I/O Behavior (Eugen Betke, Julian Kunkel), In High Performance Computing: ISC High Performance 2019 International Workshops, Frankfurt/Main, Germany, June 16-20, 2019, Revised Selected Papers, Lecture Notes in Computer Science (11887), pp. 214–226, (Editors: Michèle Weiland, Guido Juckeland, Sadaf Alam, Heike Jagode), Springer, HPC IODC workshop, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-34356-9, ISSN: 1611-3349, 2019-12-03 BibTeX URL DOI PDF
  • Tracking User-Perceived I/O Slowdown via Probing (Julian Kunkel, Eugen Betke), In High Performance Computing: ISC High Performance 2019 International Workshops, Frankfurt/Main, Germany, June 16-20, 2019, Revised Selected Papers, Lecture Notes in Computer Science (11887), pp. 169–182, (Editors: Michèle Weiland, Guido Juckeland, Sadaf Alam, Heike Jagode), Springer, HPC-IODC workshop, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-34356-9, ISSN: 1611-3349, 2019-12-03 BibTeX URL DOI PDF
  • Analysis of parallel I/O use on the UK national supercomputing service, ARCHER using Cray's LASSi and EPCC SAFE (Andrew Turner, Dominic Sloan-Murphy, Karthee Sivalingam, Harvey Richardson, Julian Kunkel), CUG, Montreal, Canada, 2019-10-11 BibTeX URL PDF
  • What Company Does My News Article Refer to? Tackling Multi Class Problems With Topic Modeling (Max Lübbering, Julian Kunkel, Patricio Farrell), In Proceedings of the Conference on “Lernen, Wissen, Daten, Analysen”, Berlin, Germany, September 30 - October 2, 2019, CEUR Workshop Proceedings (2454), pp. 353–364, (Editors: Robert Jäschke, Matthias Weidlich), CEUR-WS.org, LWDA 2019, Berlin, Germany, 2019-09-25 BibTeX URL PDF
  • Poster: The Virtual Institute for I/O and the IO-500 (Julian Kunkel, Jay Lofstead, John Bent, George Markomanolis), ISC High Performance 2019, Frankfurt, Germany, 2019-06-19 BibTeX URL PDF
  • Poster: Performance Conscious HPC (PeCoH) - 2019 (Kai Himstedt, Nathanael Hübbe, Sandra Schröder, Hendryk Bockelmann, Michael Kuhn, Julian Kunkel, Stephan Olbrich, Thomas Ludwig, Matthias Riebisch, Markus Stammberger, Hinnerk Stüben), ISC High Performance, Frankfurt, Germany, 2019-06-19 BibTeX URL PDF
  • Poster: Advanced Computation and I/O Methods for Earth-System Simulations (AIMES) (Nabeeh Jumah, Julian Kunkel, Anastasiia Novikova, Thomas Ludwig, Thomas Dubos, Sunmin Park, Hisashi Yashiro, Günther Zängl, John Thuburn), ISC High Performance, Frankfurt, Germany, 2019-06-19 BibTeX URL PDF
  • Poster: International HPC Certification Program (Julian Kunkel, Kai Himstedt, Weronika Filinger, Jean-Thomas Acquaviva, Lev Lafayette, Anja Gerbes, Waseem Kamleh, Sharan Kalwan), ISC High Performance, Frankfurt, Germany, 2019-06-19 BibTeX URL PDF
  • Interference of Billing and Scheduling Strategies for Energy and Cost Savings in Modern Data Centers (Julian Kunkel, Hayk Shoukourian, Reza Heidari, Torsten Wilde), In Sustainable Computing: Informatics and Systems, Series: Sustainable Computing, (Editors: Ishfaq Ahmad), Elsevier, ISSN: 2210-5379, 2019-04-19 BibTeX DOI PDF
  • A blueprint for the new Strategic Research Agenda for High Performance Computing (Gabriel Antoniu, Marc Asch, Peter Bauer, Costas Bekas, Pascale Bernier-Bruna, Francois Bodin, Laurent Cargemel, Paul Carpenter, Marc Duranton, Maike Gilliot, Hans-Christian Hoppe, Jens Krueger, Julian Kunkel, Erwin Laure, Jean-Francois Lavignon, Guy Lonsdale, Michael Malms, Fabio Martinelli, Sai Narasimhamurthy, Marcin Ostasz, Maria Perez, Dirk Pleiter, Andrea Reale, Pascale Rosse-Laurent), ETP4HPC, EXDCI, 2019-04 BibTeX URL
  • Towards Green Scientific Data Compression Through High-Level I/O Interfaces (Yevhen Alforov, Anastasiia Novikova, Michael Kuhn, Julian Kunkel, Thomas Ludwig), In 30th International Symposium on Computer Architecture and High Performance Computing, pp. 209–216, IEEE Computer Society (Washington, DC, USA), SBAC-PAD 2018, Lyon, France, ISBN: 978-1-5386-7769-8, ISSN: 1550-6533, 2019-02-21 BibTeX DOI PDF
  • Toward Understanding I/O Behavior in HPC Workflows (Jakob Lüttgau, Shane Snyder, Philip Carns, Justin M. Wozniak, Julian Kunkel, Thomas Ludwig), In IEEE/ACM 3rd International Workshop on Parallel Data Storage & Data Intensive Scalable Computing Systems (PDSW-DISCS), pp. 64–75, IEEE Computer Society (Washington, DC, USA), PDSW-DISCS, Dallas, Texas, ISBN: 978-1-7281-0192-7, 2019-02-11 BibTeX DOI
  • Beating data bottlenecks in weather and climate science (Bryan N. Lawrence, Julian Kunkel, Jonathan Churchill, Neil Massey, Philip Kershaw, Matt Pritchard), In Extreme Data Workshop 2018, Schriften des Forschungszentrums Jülich IAS Series (40), pp. 31–36, (Editors: Martin Schultz, Dirk Pleiter, Peter Bauer), Forschungszentrum Jülich, Extreme Data Workshop, Jülich, Germany, ISBN: 978-3-95806-392-1, ISSN: 1868-8489, 2019-01-25 BibTeX URL PDF
  • Cost and Performance Modeling for Earth System Data Management and Beyond (Jakob Lüttgau, Julian Kunkel), In High Performance Computing: ISC High Performance 2018 International Workshops, Frankfurt/Main, Germany, June 28, 2018, Revised Selected Papers, Lecture Notes in Computer Science (11203), pp. 23–35, (Editors: Rio Yokota, Michele Weiland, John Shalf, Sadaf Alam), Springer, ISC Team, HPC-IODC workshop, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-02465-9, ISSN: 1611-3349, 2019-01-25 BibTeX DOI PDF
  • Performance Portability of Earth System Models with User-Controlled GGDML code Translation (Nabeeh Jum'ah, Julian Kunkel), In High Performance Computing: ISC High Performance 2018 International Workshops, Frankfurt/Main, Germany, June 28, 2018, Revised Selected Papers, Lecture Notes in Computer Science (11203), pp. 693–710, (Editors: Rio Yokota, Michele Weiland, John Shalf, Sadaf Alam), Springer, ISC Team, P3MA workshop, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-02465-9, ISSN: 1611-3349, 2019-01-25 BibTeX DOI PDF
  • Understanding Metadata Latency with MDWorkbench (Julian Kunkel, George S. Markomanolis), In High Performance Computing: ISC High Performance 2018 International Workshops, Frankfurt/Main, Germany, June 28, 2018, Revised Selected Papers, Lecture Notes in Computer Science (11203), pp. 75–88, (Editors: Rio Yokota, Michele Weiland, John Shalf, Sadaf Alam), Springer, ISC Team, WOPSSS workshop, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-02465-9, ISSN: 1611-3349, 2019-01-25 BibTeX DOI PDF
  • Benefit of DDN's IME-Fuse and IME-Lustre File Systems for I/O Intensive HPC Applications (Eugen Betke, Julian Kunkel), In High Performance Computing: ISC High Performance 2018 International Workshops, Frankfurt/Main, Germany, June 28, 2018, Revised Selected Papers, Lecture Notes in Computer Science (11203), pp. 131–144, (Editors: Rio Yokota, Michele Weiland, John Shalf, Sadaf Alam), Springer, ISC Team, WOPSSS workshop, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-02465-9, ISSN: 1611-3349, 2019-01-25 BibTeX DOI PDF
  • Tools for Analyzing Parallel I/O (Julian Kunkel, Eugen Betke, Matt Bryson, Philip Carns, Rosemary Francis, Wolfgang Frings, Roland Laifer, Sandra Mendez), In High Performance Computing: ISC High Performance 2018 International Workshops, Frankfurt/Main, Germany, June 28, 2018, Revised Selected Papers, Lecture Notes in Computer Science (11203), pp. 49–70, (Editors: Rio Yokota, Michele Weiland, John Shalf, Sadaf Alam), Springer, ISC Team, HPC-IODC workshop, ISC HPC, Frankfurt, Germany, ISBN: 978-3-030-02465-9, ISSN: 1611-3349, 2019-01-25 BibTeX DOI PDF
  • Towards an HPC Certification Program (Julian Kunkel, Kai Himstedt, Nathanael Hübbe, Hinnerk Stüben, Sandra Schröder, Michael Kuhn, Matthias Riebisch, Stephan Olbrich, Thomas Ludwig, Weronika Filinger, Jean-Thomas Acquaviva, Anja Gerbes, Lev Lafayette), In Journal of Computational Science Education, Series: Volume 10, Issue 1, pp. 88–89, (Editors: Steven I. Gordon), 2019-01-11 BibTeX URL DOI
  • Automatic Vectorization of Stencil Codes with the GGDML Language Extensions (Nabeeh Jum'ah, Julian Kunkel), In Workshop on Programming Models for SIMD/Vector Processing (WPMVP'19), February 16, 2019, Washington, DC, USA, WPMVP, pp. 1–7, ACM (New York, NY, USA), PPoPP 2019, WPMVP-2019, Washington DC, USA, ISBN: 978-1-4503-6291-7/19/02, 2019 BibTeX URL DOI PDF

2018

  • Comparison of Clang Abstract Syntax Trees using String Kernels (Raul Torres, Julian Kunkel, Manuel F. Dolz, Thomas Ludwig), In 2018 International Conference on High Performance Computing & Simulation (HPCS), pp. 106–113, IEEE Computer Society (Washington, DC, USA), HPCS 2018, Orleans, France, ISBN: 978-1-5386-7879-4, 2018-11-01 BibTeX DOI
  • A Similarity Study of I/O Traces via String Kernels (Raul Torres, Julian Kunkel, Manuel F. Dolz, Thomas Ludwig), In The Journal of Supercomputing, pp. 1–13, Springer, ISSN: 0920-8542, 2018-07-03 BibTeX DOI
  • Poster: Advanced Computation and I/O Methods for Earth-System Simulations (AIMES) (Julian Kunkel, Thomas Ludwig, Thomas Dubos, Naoya Maruyama, Takayuki Aoki, Günther Zängl, Hisashi Yashiro, Ryuji Yoshida, Hirofumi Tomita, Masaki Satoh, Yann Meurdesoif, Nabeeh Jumah, Anastasiia Novikova, Anja Gerbes), ISC HPC, Frankfurt, Germany, 2018-06-26 BibTeX URL PDF
  • Poster: Performance Conscious HPC (PeCoH) - 2018 (Kai Himstedt, Nathanael Hübbe, Sandra Schröder, Hendryk Bockelmann, Michael Kuhn, Julian Kunkel, Thomas Ludwig, Stephan Olbrich, Matthias Riebisch, Markus Stammberger, Hinnerk Stüben), ISC HPC, Frankfurt, Germany, 2018-06-26 BibTeX URL PDF
  • Poster: International HPC Certification Program (Julian Kunkel, Kai Himstedt, Weronika Filinger, Jean-Thomas Acquaviva, William Jalby, Lev Lafayette), ISC HPC, Frankfurt, Germany, 2018-06-26 BibTeX URL PDF
  • Poster: The Virtual Institute for I/O and the IO-500 (Julian Kunkel, Jay Lofstead, John Bent), ISC HPC, Frankfurt, Germany, 2018-06-26 BibTeX URL PDF
  • Poster: A user-controlled GGDML Code Translation Technique for Performance Portability of Earth System Models (Nabeeh Jumah, Julian Kunkel), ISC HPC, Frankfurt, Germany, 2018-06-26 BibTeX URL PDF
  • Poster: Automatic Profiling for Climate Modeling (Anja Gerbes, Nabeeh Jumah, Julian Kunkel), Euro LLVM, Bristol, United Kingdom, 2018-04-17 BibTeX URL PDF
  • A Survey of Storage Systems for High-Performance Computing (Jakob Lüttgau, Michael Kuhn, Kira Duwe, Yevhen Alforov, Eugen Betke, Julian Kunkel, Thomas Ludwig), In Supercomputing Frontiers and Innovations, Series: Volume 5, Number 1, pp. 31–58, (Editors: Jack Dongarra, Vladimir Voevodin), Publishing Center of South Ural State University (454080, Lenin prospekt, 76, Chelyabinsk, Russia), 2018-04 BibTeX URL DOI PDF

2017

  • Towards Decoupling the Selection of Compression Algorithms from Quality Constraints – an Investigation of Lossy Compression Efficiency (Julian Kunkel, Anastasiia Novikova, Eugen Betke), In Supercomputing Frontiers and Innovations, Series: Volume 4, Number 4, pp. 17–33, (Editors: Jack Dongarra, Vladimir Voevodin), 2017-12 BibTeX URL DOI PDF
  • Poster: Adaptive Tier Selection for NetCDF and HDF5 (Jakob Lüttgau, Eugen Betke, Olga Perevalova, Julian Kunkel, Michael Kuhn), SC17, Denver, CO, USA, 2017-11-14 BibTeX PDF
  • Poster: Toward Decoupling the Selection of Compression Algorithms from Quality Constraints (Julian Kunkel, Anastasia Novikova, Eugen Betke), SC17, Denver, CO, USA, 2017-11-14 BibTeX PDF
  • Understanding Hardware and Software Metrics with respect to Power Consumption (Julian Kunkel, Manuel F. Dolz), In Sustainable Computing: Informatics and Systems, Series: Sustainable Computing, (Editors: Ishfaq Ahmad), Elsevier, ISSN: 2210-5379, 2017-11-04 BibTeX URL DOI PDF
  • Real-Time I/O-Monitoring of HPC Applications with SIOX, Elasticsearch, Grafana and FUSE (Eugen Betke, Julian Kunkel), In High Performance Computing: ISC High Performance 2017 International Workshops, DRBSD, ExaComm, HCPM, HPC-IODC, IWOPH, IXPUG, P^3MA, VHPC, Visualization at Scale, WOPSSS, Lecture Notes in Computer Science (10524), pp. 158–170, (Editors: Julian Kunkel, Rio Yokota, Michaela Taufer, John Shalf), Springer, ISC High Performance, Frankfurt, Germany, ISBN: 978-3-319-67629-6, 2017-10-20 BibTeX DOI PDF
  • An MPI-IO In-Memory Driver for Non-Volatile Pooled Memory of the Kove XPD (Julian Kunkel, Eugen Betke), In High Performance Computing: ISC High Performance 2017 International Workshops, DRBSD, ExaComm, HCPM, HPC-IODC, IWOPH, IXPUG, P^3MA, VHPC, Visualization at Scale, WOPSSS, Lecture Notes in Computer Science (10524), pp. 644–655, (Editors: Julian Kunkel, Rio Yokota, Michaela Taufer, John Shalf), Springer, ISC High Performance, Frankfurt, Germany, ISBN: 978-3-319-67629-6, 2017-10-20 BibTeX DOI PDF
  • Poster: Icosahedral Modeling with GGDML (Nabeeh Jumah, Julian Kunkel, Günther Zängl, Hisashi Yashiro, Thomas Dubos, Yann Meurdesoif), DKRZ user workshop 2017, Hamburg, Germany, 2017-10-09 BibTeX PDF
  • GGDML: Icosahedral Models Language Extensions (Nabeeh Jumah, Julian Kunkel, Günther Zängl, Hisashi Yashiro, Thomas Dubos, Yann Meurdesoif), In Journal of Computer Science Technology Updates, Series: Volume 4, Number 1, pp. 1–10, Cosmos Scholars Publishing House, 2017-06-21 BibTeX URL DOI
  • Poster: The Virtual Institute for I/O and the IO-500 (Julian Kunkel, Jay Lofstead, John Bent), ISC High Performance 2017, Frankfurt, Germany, 2017-06-20 BibTeX PDF
  • Poster: Advanced Computation and I/O Methods for Earth-System Simulations (AIMES) (Julian Kunkel, Thomas Ludwig, Thomas Dubos, Naoya Maruyama, Takayuki Aoki, Günther Zängl, Hisashi Yashiro, Ryuji Yoshida, Hirofumi Tomita, Masaki Satoh, Yann Meurdesoif, Nabeeh Jumah, Anastasiia Novikova), ISC 2017, Germany, Frankfurt, 2017-06-20 BibTeX URL
  • Poster: Towards Performance Portability for Atmospheric and Climate Models with the GGDML DSL (Nabeeh Jumah, Julian Kunkel, Günther Zängl, Hisashi Yashiro, Thomas Dubos, Yann Meurdesoif), ISC 2017, Germany, Frankfurt, 2017-06-20 BibTeX URL
  • Poster: Performance Conscious HPC (PeCoH) (Julian Kunkel, Michael Kuhn, Thomas Ludwig, Matthias Riebisch, Stephan Olbrich, Hinnerk Stüben, Kai Himstedt, Hendryk Bockelmann, Markus Stammberger), ISC High Performance 2017, Frankfurt, Germany, 2017-06-20 BibTeX URL
  • Poster: Enhanced Adaptive Compression in Lustre (Anna Fuchs, Michael Kuhn, Julian Kunkel, Thomas Ludwig), ISC High Performance 2017, Frankfurt, Germany, 2017-06-20 BibTeX URL
  • Poster: FortranTestGenerator: Automatic and Flexible Unit Test Generation for Legacy HPC Code (Christian Hovy, Julian Kunkel), ISC High Performance 2017, Frankfurt, 2017-06-20 BibTeX PDF
  • Wissenschaftliches Rechnen - Scientific Computing - 2016 (Yevhen Alforov, Eugen Betke, Konstantinos Chasapis, Anna Fuchs, Fabian Große, Nabeeh Jumah, Michael Kuhn, Julian Kunkel, Hermann Lenhart, Jakob Lüttgau, Philipp Neumann, Anastasiia Novikova, Jannek Squar, Thomas Ludwig), Research Group: Scientific Computing, University of Hamburg (Deutsches Klimarechenzentrum GmbH, Bundesstraße 45a, D-20146 Hamburg), 2017-06-19 BibTeX PDF
  • SFS: A Tool for Large Scale Analysis of Compression Characteristics (Julian Kunkel), Research Papers (4), Research Group: Scientific Computing, University of Hamburg (Deutsches Klimarechenzentrum GmbH, Bundesstraße 45a, D-20146 Hamburg), 2017-05-05 BibTeX PDF
  • Interaktiver C-Programmierkurs, ICP (Julian Kunkel, Jakob Lüttgau), In HOOU Content Projekte der Vorprojektphase 2015/16 – Sonderband zum Fachmagazin Synergie (Kerstin Mayrberger), pp. 182–186, Universität Hamburg (Universität Hamburg, Mittelweg 177, 20148 Hamburg), ISBN: 978-3-924330-57-6, 2017-04-10 BibTeX URL
  • Poster: Intelligent Selection of Compiler Options to Optimize Compile Time and Performance (Anja Gerbes, Julian Kunkel, Nabeeh Jumah), Euro LLVM, Saarbrücken, 2017-03-27 BibTeX URL PDF
  • Simulation of Hierarchical Storage Systems for TCO and QoS (Jakob Lüttgau, Julian Kunkel), In High Performance Computing: ISC High Performance 2017 International Workshops, DRBSD, ExaComm, HCPM, HPC-IODC, IWOPH, IXPUG, P^3MA, VHPC, Visualization at Scale, WOPSSS, Lecture Notes in Computer Science (10524), pp. 116–128, (Editors: Julian Kunkel, Rio Yokota, Michaela Taufer, John Shalf), Springer, ISC High Performance, Frankfurt, Germany, ISBN: 978-3-319-67629-6, 2017 BibTeX DOI PDF
  • Toward Decoupling the Selection of Compression Algorithms from Quality Constraints (Julian Kunkel, Anastasiia Novikova, Eugen Betke, Armin Schaare), In High Performance Computing: ISC High Performance 2017 International Workshops, DRBSD, ExaComm, HCPM, HPC-IODC, IWOPH, IXPUG, P^3MA, VHPC, Visualization at Scale, WOPSSS, Lecture Notes in Computer Science (10524), pp. 1–12, (Editors: Julian Kunkel, Rio Yokota, Michaela Taufer, John Shalf), Springer, ISC High Performance, Frankfurt, Germany, ISBN: 978-3-319-67629-6, 2017 BibTeX DOI PDF
  • A Novel String Representation and Kernel Function for the Comparison of I/O Access Patterns (Raul Torres, Julian Kunkel, Manuel Dolz, Thomas Ludwig), In International Conference on Parallel Computing Technologies, Lecture Notes in Computer Science (10421), pp. 500–512, (Editors: Victor Malyshkin), Springer, PaCT, Nizhni Novgorod, Russia, ISBN: 978-3-319-62932-2, 2017 BibTeX DOI PDF

2016

  • Poster: Analyzing Data Properties using Statistical Sampling Techniques – Illustrated on Scientific File Formats and Compression Features (Julian Kunkel), ISC High Performance 2016, Frankfurt, 2016-21-06 – Awards: Best Poster BibTeX PDF
  • Poster: Predicting I/O-performance in HPC using Artificial Neural Networks (Jan Fabian Schmid, Julian Kunkel), ISC High Performance 2015, Frankfurt, 2016-21-06 BibTeX PDF
  • Interaktiver C-Programmierkurs, ICP (Julian Kunkel, Jakob Lüttgau), In Synergie, Fachmagazin für Digitalisierung in der Lehre (2), pp. 74–75, 2016-11-16 BibTeX URL
  • Poster: Modeling and Simulation of Tape Libraries for Hierarchical Storage Systems (Jakob Lüttgau, Julian Kunkel), SC16, Salt Lake City, Utah, USA, 2016-11-15 BibTeX URL PDF
  • Poster: Utilizing In-Memory Storage for MPI-IO (Julian Kunkel, Eugen Betke), SC16, Salt Lake City, Utah, USA, 2016-11-15 BibTeX URL PDF
  • Analyzing Data Properties using Statistical Sampling – Illustrated on Scientific File Formats (Julian Kunkel), In Supercomputing Frontiers and Innovations, Series: Volume 3, Number 3, pp. 19–33, (Editors: Jack Dongarra, Vladimir Voevodin), 2016-10 BibTeX URL DOI
  • Predicting I/O Performance in HPC Using Artificial Neural Networks (Jan Fabian Schmid, Julian Kunkel), In Supercomputing Frontiers and Innovations, Series: Volume 3, Number 3, pp. 34–39, (Editors: Jack Dongarra, Vladimir Voevodin), 2016-10 BibTeX URL DOI
  • Data Compression for Climate Data (Michael Kuhn, Julian Kunkel, Thomas Ludwig), In Supercomputing Frontiers and Innovations, Series: Volume 3, Number 1, pp. 75–94, (Editors: Jack Dongarra, Vladimir Voevodin), 2016-06 BibTeX URL DOI PDF
  • Analyzing Data Properties using Statistical Sampling Techniques – Illustrated on Scientific File Formats and Compression Features (Julian Kunkel), In High Performance Computing: ISC High Performance 2016 International Workshops, ExaComm, E-MuCoCoS, HPC-IODC, IXPUG, IWOPH, P3MA, VHPC, WOPSSS, Lecture Notes in Computer Science (9945 2016), pp. 130–141, (Editors: Michela Taufer, Bernd Mohr, Julian Kunkel), Springer, ISC-HPC 2017, Frankfurt, Germany, ISBN: 978-3-319-46079-6, 2016-06 BibTeX DOI PDF
  • Towards Automatic and Flexible Unit Test Generation for Legacy HPC Code (Christian Hovy, Julian Kunkel), In Proceedings of the Fourth International Workshop on Software Engineering for High Performance Computing in Computational Science and Engineering, SEHPCCSE16, Salt Lake City, Utah, USA, 2016 BibTeX DOI

2015

  • Poster: Interaktiver C Kurs (ICP) (Julian Kunkel, Thomas Ludwig, Jakob Lüttgau, Dion Timmermann, Christian Kautz, Volker Skwarek), Campus Innovation 2015, Hamburg, 2015-11-27 BibTeX URL
  • Poster: Using Machine Learning to Predict the Performance of Non-Contiguous I/O (Julian Kunkel, Michaela Zimmer, Eugen Betke), Frankfurt, Germany, 2015-07-13 BibTeX URL
  • Poster: Advanced Data Sieving for Non-Contigouous I/O (Enno Zickler, Julian Kunkel), Frankfurt, Germany, 2015-07-13 BibTeX URL
  • Monitoring energy consumption with SIOX (Julian Kunkel, Alvaro Aguilera, Nathanael Hübbe, Marc Wiedemann, Michaela Zimmer), In Computer Science – Research and Development, Series: Volume 30, Number 2, pp. 125–133, Springer, ISSN: 1865-2034, 2015-05 BibTeX URL DOI PDF
  • Identifying Relevant Factors in the I/O-Path using Statistical Methods (Julian Kunkel), Research Papers (3), Research Group: Scientific Computing, University of Hamburg (Deutsches Klimarechenzentrum GmbH, Bundesstraße 45a, D-20146 Hamburg), 2015-03-14 BibTeX PDF
  • An analytical methodology to derive power models based on hardware and software metrics (Manuel F. Dolz, Julian Kunkel, Konstantinos Chasapis, Sandra Catalan), In Computer Science - Research and Development, pp. 1–10, Springer US, ISSN: 1865-2042, 2015 BibTeX DOI PDF
  • Predicting Performance of Non-Contiguous I/O with Machine Learning (Julian Kunkel, Eugen Betke, Michaela Zimmer), In High Performance Computing, 30th International Conference, ISC High Performance 2015, Lecture Notes in Computer Science (9137), pp. 257–273, (Editors: Julian Martin Kunkel, Thomas Ludwig), ISC High Performance, Frankfurt, ISSN: 0302-9743, 2015 BibTeX DOI PDF
  • Speicherung großer Datenmengen und Energieeffizienz (Thomas Ludwig, Manuel Dolz, Michael Kuhn, Julian Kunkel, Hermann Lenhart), Max-Planck-Gesselschaft (München), 2015 BibTeX URL

2014

  • Poster: SIOX: An Infrastructure for Monitoring and Optimization of HPC-I/O (Julian Kunkel, Michaela Zimmer, Marc Wiedemann, Nathanael Hübbe, Alvaro Aguilera, Holger Mickler, Xuan Wang, Andrij Chut, Thomas Bönisch), ISC'14 Leipzig, 2014-06-23 BibTeX URL
  • Exascale Storage Systems – An Analytical Study of Expenses (Julian Kunkel, Michael Kuhn, Thomas Ludwig), In Supercomputing Frontiers and Innovations, Series: Volume 1, Number 1, pp. 116–134, (Editors: Jack Dongarra, Vladimir Voevodin), 2014-06 BibTeX URL
  • Whitepaper: E10 – Exascale IO (Andre Brinkmann, Toni Cortes, Hugo Falter, Julian Kunkel, Sai Narasimhamurthy), 2014-06 BibTeX URL PDF
  • Feign: In-Silico Laboratory for Researching I/O Strategies (Jakob Lüttgau, Julian Kunkel), In Parallel Data Storage Workshop (PDSW), 2014 9th, pp. 43–48, SC14, New Orleans, 2014 BibTeX URL
  • Predicting Performance of Non-Contiguous I/O with Machine Learning (Julian Kunkel, Eugen Betke, Michaela Zimmer), In Parallel Data Storage Workshop (PDSW), Work in progress session, pp. 43–48, SC14, New Orleans, 2014 BibTeX URL
  • A Comparison of Trace Compression Methods for Massively Parallel Applications in Context of the SIOX Project (Alvaro Aguilera, Holger Mickler, Julian Kunkel, Michaela Zimmer, Marc Wiedemann, Ralph Müller-Pfefferkorn), In Tools for High Performance Computing 2013, pp. 91–105, ISBN: 978-3-319-08143-4, 2014 BibTeX
  • The SIOX Architecture – Coupling Automatic Monitoring and Optimization of Parallel I/O (Julian Kunkel, Michaela Zimmer, Nathanael Hübbe, Alvaro Aguilera, Holger Mickler, Xuan Wang, Andrij Chut, Thomas Bönisch, Jakob Lüttgau, Roman Michel, Johann Weging), In Supercomputing, Supercomputing, pp. 245–260, (Editors: Julian Kunkel, Thomas Ludwig, Hans Meuer), Lecture Notes in Computer Science, ISC events, ISC'14, Leipzig, ISBN: 978-3-319-07517-4, 2014 BibTeX DOI PDF

2013

  • ICON DSL: A Domain-Specific Language for climate modeling (Raul Torres, Leonidas Lindarkis, Julian Kunkel, Thomas Ludwig), In WOLFHPC 2013 Third International Workshop on Domain-Specific Languages and High-Level Frameworks for High Performance Computing, SC13, Denver, 2013-11-18 BibTeX URL
  • Poster: Source-to-Source Translation for Climate Models (Raul Torres, Leonidas Lindarkis, Julian Kunkel), International Supercomputing Conference 2013, Leipzig, Germany, 2013-06-17 BibTeX URL
  • Using Simulation to Validate Performance of MPI(-IO) Implementations (Julian Kunkel), In Supercomputing, Lecture Notes in Computer Science (7905), pp. 181–195, (Editors: Julian Martin Kunkel, Thomas Ludwig, Hans Werner Meuer), Springer (Berlin, Heidelberg), ISC 2013, Leipzig, Germany, ISBN: 978-3-642-38749-4, ISSN: 0302-9743, 2013-06 BibTeX DOI PDF
  • Evaluating Lossy Compression on Climate Data (Nathanael Hübbe, Al Wegener, Julian Kunkel, Yi Ling, Thomas Ludwig), In Supercomputing, Lecture Notes in Computer Science (7905), pp. 343–356, (Editors: Julian Martin Kunkel, Thomas Ludwig, Hans Werner Meuer), Springer (Berlin, Heidelberg), ISC 2013, Leipzig, Germany, ISBN: 978-3-642-38749-4, ISSN: 0302-9743, 2013-06 BibTeX DOI PDF
  • Towards Self-optimization in HPC I/O (Michaela Zimmer, Julian Kunkel, Thomas Ludwig), In Supercomputing, Lecture Notes in Computer Science (7905), pp. 422–434, (Editors: Julian Martin Kunkel, Thomas Ludwig, Hans Werner Meuer), Springer (Berlin, Heidelberg), ISC 2013, Leipzig, Germany, ISBN: 978-3-642-38749-4, ISSN: 0302-9743, 2013-06 BibTeX DOI PDF
  • Performance-optimized clinical IMRT planning on modern CPUs (Peter Ziegenhein, Cornelis Ph Kamerling, Mark Bangert, Julian Kunkel, Uwe Oelfke), In Physics in Medicine and Biology, Series: Volume 58 Number 11, IOP Publishing, ISSN: 1361-6560, 2013-05-08 BibTeX URL DOI
  • Reducing the HPC-Datastorage Footprint with MAFISC – Multidimensional Adaptive Filtering Improved Scientific data Compression (Nathanel Hübbe, Julian Kunkel), In Computer Science - Research and Development, Series: Volume 28, Issue 2-3, pp. 231–239, Springer, 2013-05 BibTeX URL PDF
  • Towards I/O Analysis of HPC Systems and a Generic Architecture to Collect Access Patterns (Marc Wiedemann, Julian Kunkel, Michaela Zimmer, Thomas Ludwig, Michael Resch, Thomas Bönisch, Xuan Wang, Andriy Chut, Alvaro Aguilera, Wolfgang E. Nagel, Michael Kluge, Holger Mickler), In Computer Science - Research and Development, Series: 28, pp. 241–251, Springer New York Inc. (Hamburg, Berlin, Heidelberg), ISSN: 1865-2034, 2013-05 BibTeX URL PDF

2012

  • A Study on Data Deduplication in HPC Storage Systems (Dirk Meister, Jürgen Kaiser, Andre Brinkmann, Michael Kuhn, Julian Kunkel, Toni Cortes), In Proceedings of the ACM/IEEE Conference on High Performance Computing (SC), IEEE Computer Society (Washington, DC, USA), SC'12, Salt Lake City, USA, 2012-11-10 BibTeX
  • Simulating parallel programs on application and system level (Julian Kunkel), In Computer Science – Research and Development, Series: Volume 28 Number 2-3, Springer (Berlin, Heidelberg), ISSN: 1865-2042, 2012-06 BibTeX URL DOI PDF
  • Tool Environments to Measure Power Consumption and Computational Performance (Timo Minartz, Daniel Molka, Julian Kunkel, Michael Knobloch, Michael Kuhn, Thomas Ludwig), In Handbook of Energy-Aware and Green Computing (Ishfaq Ahmad, Sanjay Ranka), Chapters: 31, pp. 709–743, Chapman and Hall/CRC Press Taylor and Francis Group (6000 Broken Sound Parkway NW, Boca Raton, FL 33487), ISBN: 978-1-4398-5040-4, 2012 BibTeX
  • Scientific Computing: Performance and Efficiency in Climate Models (Sandra Schröder, Michael Kuhn, Nathanael Hübbe, Julian Kunkel, Timo Minartz, Petra Nerge, Florens Wasserfall, Thomas Ludwig), In Proceedings of the Work in Progress Session, 20th Euromicro International Conference on Parallel, Distributed and Network-Based Processing, SEA-Publications (31), (Editors: Erwin Grosspietsch, Konrad Klöckner), Institute for Systems Engineering and Automation (Johannes Kepler University Linz), Munich Network Management Team, PDP 2012, Garching, Germany, ISBN: 978-3-902457-31-8, 2012 BibTeX
  • Simulating Application and System Interaction with PIOsimHD (Julian Kunkel, Thomas Ludwig), In Proceedings of the Work in Progress Session, 20th Euromicro International Conference on Parallel, Distributed and Network-Based Processing, SEA-Publications (31), (Editors: Erwin Grosspietsch, Konrad Klöckner), Institute for Systems Engineering and Automation (Johannes Kepler University Linz), Munich Network Management Team, PDP 2012, Garching, Germany, ISBN: 978-3-902457-31-8, 2012 BibTeX
  • Simulation-Aided Performance Evaluation of Server-Side Input/Output Optimizations (Michael Kuhn, Julian Kunkel, Thomas Ludwig), In 20th Euromicro International Conference on Parallel, Distributed and Network-Based Processing, pp. 562–566, (Editors: Rainer Stotzka, Michael Schiffers, Yiannis Cotronis), IEEE Computer Society (Los Alamitos, Washington, Tokyo), Munich Network Management Team, PDP 2012, Garching, Germany, ISBN: 978-0-7695-4633-9, ISSN: 1066-6192, 2012 BibTeX
  • IOPm – Modeling the I/O Path with a Functional Representation of Parallel File System and Hardware Architecture (Julian Kunkel, Thomas Ludwig), In 20th Euromicro International Conference on Parallel, Distributed and Network-Based Processing, pp. 554–561, (Editors: Rainer Stotzka, Michael Schiffers, Yiannis Cotronis), IEEE Computer Society (Los Alamitos, Washington, Tokyo), Munich Network Management Team, PDP 2012, Garching, Germany, ISBN: 978-0-7695-4633-9, ISSN: 1066-6192, 2012 BibTeX
  • Optimizations for Two-Phase Collective I/O (Michael Kuhn, Julian Kunkel, Yuichi Tsujita, Hidetaka Muguruma, Thomas Ludwig), In Applications, Tools and Techniques on the Road to Exascale Computing, Advances in Parallel Computing (22), pp. 455–462, (Editors: Koen De Bosschere, Erik H. D'Hollander, Gerhard R. Joubert, David Padua, Frans Peters), IOS Press (Amsterdam, Berlin, Tokyo, Washington DC), University of Ghent, ELIS Department, ParCo 2011, Ghent, Belgium, ISBN: 978-1-61499-040-6, ISSN: 0927-5452, 2012 BibTeX
  • Visualization of MPI(-IO) Datatypes (Julian Kunkel, Thomas Ludwig), In Applications, Tools and Techniques on the Road to Exascale Computing, Advances in Parallel Computing (22), pp. 473–480, (Editors: Koen De Bosschere, Erik H. D'Hollander, Gerhard R. Joubert, David Padua, Frans Peters), IOS Press (Amsterdam, Berlin, Tokyo, Washington DC), University of Ghent, ELIS Department, ParCo 2011, Ghent, Belgium, ISBN: 978-1-61499-040-6, ISSN: 0927-5452, 2012 BibTeX

2011

  • HDTrace – A Tracing and Simulation Environment of Application and System Interaction (Julian Kunkel), Research Papers (2), Research Group: Scientific Computing, University of Hamburg (Deutsches Klimarechenzentrum GmbH, Bundesstraße 45a, D-20146 Hamburg), 2011-01-23 BibTeX PDF
  • Towards an Energy-Aware Scientific I/O Interface – Stretching the ADIOS Interface to Foster Performance Analysis and Energy Awareness (Julian Kunkel, Timo Minartz, Michael Kuhn, Thomas Ludwig), In Computer Science - Research and Development, Series: 1, (Editors: Thomas Ludwig), Springer (Berlin / Heidelberg, Germany), 2011 BibTeX DOI PDF

2010

  • System Performance Comparison of Stencil Operations with the Convey HC-1 (Julian Kunkel, Petra Nerge), Technical Reports (1), Research Group: Scientific Computing, University of Hamburg (Deutsches Klimarechenzentrum GmbH, Bundesstraße 45a, D-20146 Hamburg), 2010-11-16 BibTeX URL
  • Classification of Network Computers Based on Distribution of ICMP-echo Round-trip Times (Julian Kunkel, Jan C. Neddermeyer, Thomas Ludwig), Research Papers (1), Staats- und Universitätsbibliothek Hamburg (Carl von Ossietzky, Von-Melle-Park 3, 20146 Hamburg), 2010-09-28 BibTeX URL
  • Poster: Benchmarking Application I/O in the Community (Julian Kunkel, Olga Mordvinova, Dennis Runz, Michael Kuhn, Thomas Ludwig), International Supercomputing Conference, Hamburg, Germany, 2010-06-01 BibTeX Abstract PDF
  • Poster: Simulation of Cluster Power Consumption and Energy-to-Solution (Timo Minartz, Julian Kunkel, Thomas Ludwig), International Conference on Energy-Efficient Computing and Networking, Passau, Germany, 2010-04-14 BibTeX URL
  • From experimental setup to bioinformatics: an RNAi screening platform to identify host factors involved in HIV-1 replication (Kathleen Börner, Johannes Hermle, Christoph Sommer, Nigel P. Brown, Bettina Knapp, Bärbel Glass, Julian Kunkel, Gloria Torralba, Jürgen Reymann, Nina Beil, Jürgen Beneke, Rainer Pepperkok, Reinhard Schneider, Thomas Ludwig, Michael Hausmann, Fred Hamprecht, Holger Erfle, Lars Kaderali, Hans-Georg Kräusslich, Maik J. Lehmann), In Biotechnology Journal, Series: 5-1, pp. 39–49, WILEY-VCH (Weinheim, Germany), ISSN: 1860-7314, 2010-01 BibTeX URL DOI
  • Collecting Energy Consumption of Scientific Data (Julian Kunkel, Olga Mordvinova, Michael Kuhn, Thomas Ludwig), In Computer Science - Research and Development, Series: 3, pp. 1–9, (Editors: Thomas Ludwig), Springer (Berlin / Heidelberg, Germany), ISSN: 1865-2034, 2010 BibTeX URL DOI
  • Simulation of power consumption of energy efficient cluster hardware (Timo Minartz, Julian Kunkel, Thomas Ludwig), In Computer Science - Research and Development, Series: 3, pp. 165–175, (Editors: Thomas Ludwig), Springer (Berlin / Heidelberg, Germany), ISSN: 1865-2034, 2010 BibTeX URL DOI
  • I/O Performance Evaluation with Parabench – Programmable I/O Benchmark (Olga Mordvinova, Dennis Runz, Julian Kunkel, Thomas Ludwig), In Procedia Computer Science, Series: 1-1, pp. 2119–2128, Elsevier B.V (Amsterdam, Netherlands), ISSN: 1877-0509, 2010 BibTeX URL DOI
  • Tracing Performance of MPI-I/O with PVFS2: A Case Study of Optimization (Yuichi Tsujita, Julian Kunkel, Stephan Krempel, Thomas Ludwig), In Parallel Computing: From Multicores and GPU's to Petascale, pp. 379–386, IOS Press, PARCO 2009, ISBN: 978-1-60750-530-3, 2010 BibTeX URL DOI PDF

2009

  • Tracing Internal Communication in MPI and MPI-I/O (Julian Kunkel, Yuichi Tsujita, Olga Mordvinova, Thomas Ludwig), In International Conference on Parallel and Distributed Computing, Applications and Technologies, PDCAT, pp. 280–286, IEEE Computer Society (Washington, DC, USA), Hiroshima University, PDCAT-09, Higashi Hiroshima, Japan, ISBN: 978-0-7695-3914-0, 2009-12-29 BibTeX DOI
  • USB Flash Drives as an Energy Efficiency Storage Alternative (Olga Mordvinova, Julian Kunkel, Christian Baun, Thomas Ludwig, Marcel Kunze), In Proceedings of the 10th IEEE/ACM International Conference on Grid Computing, pp. 175–182, IEEE Computer Society (Washington, DC, USA), IEEE/ACM, GRID-09, Banff, Alberta, Canada, ISBN: 978-1-4244-5148-7, 2009-10 BibTeX DOI
  • Dynamic file system semantics to enable metadata optimizations in PVFS (Michael Kuhn, Julian Kunkel, Thomas Ludwig), In Concurrency and Computation: Practice and Experience, Series: 21-14, pp. 1775–1788, John Wiley and Sons Ltd. (Chichester, UK), ISSN: 1532-0626, 2009 BibTeX URL DOI
  • Using Non-blocking I/O Operations in High Performance Computing to Reduce Execution Times (David Buettner, Julian Kunkel, Thomas Ludwig), In Proceedings of the 16th European PVM/MPI Users' Group Meeting on Recent Advances in Parallel Virtual Machine and Message Passing Interface, pp. 134–142, Springer-Verlag (Berlin, Heidelberg), CSC - IT, EuroPVM/MPI-09, Espoo, Finland, ISBN: 978-3-642-03769-6, 2009 BibTeX URL DOI
  • Small-file Access in Parallel File Systems (Philip Carns, Sam Lang, Robert Ross, Murali Vilayannur, Julian Kunkel, Thomas Ludwig), In IPDPS '09: Proceedings of the 2009 IEEE International Symposium on Parallel and Distributed Processing, pp. 1–11, IEEE Computer Society (Washington, DC, USA), University of Rome, IPDPS-09, Rome, Italy, ISBN: 978-1-4244-3751-1, 2009 BibTeX URL DOI
  • Poster: Data Storage and Processing for High Throughput RNAi Screening (Julian Kunkel, Thomas Ludwig, M. Hemberger, G. Torralba, E. Schmitt, M. Hausmann, V. Lindenstruth, N. Brown, R. Schneider), German Symposium on Systems Biology 2009, Heidelberg, Germany, 2009 BibTeX PDF

2008

  • Bottleneck Detection in Parallel File Systems with Trace-Based Performance Monitoring (Julian Kunkel, Thomas Ludwig), In Euro-Par '08: Proceedings of the 14th international Euro-Par conference on Parallel Processing, pp. 212–221, Springer-Verlag (Berlin, Heidelberg), University of Las Palmas de Gran Canaria, Euro-Par-08, Las Palmas de Gran Canaria, Spain, ISBN: 978-3-540-85450-0, 2008 BibTeX URL DOI
  • Directory-Based Metadata Optimizations for Small Files in PVFS (Michael Kuhn, Julian Kunkel, Thomas Ludwig), In Euro-Par '08: Proceedings of the 14th international Euro-Par conference on Parallel Processing, pp. 90–99, Springer-Verlag (Berlin, Heidelberg), University of Las Palmas de Gran Canaria, Euro-Par-08, Las Palmas de Gran Canaria, Spain, ISBN: 978-3-540-85450-0, 2008 – Awards: Best Paper BibTeX DOI

2007

  • Performance Evaluation of the PVFS2 Architecture (Julian Kunkel, Thomas Ludwig), In PDP '07: Proceedings of the 15th Euromicro International Conference on Parallel, Distributed and Network-Based Processing, pp. 509–516, IEEE Computer Society (Washington, DC, USA), Euromicro, PDP-07, Napoli, Italy, ISBN: 0-7695-2784-1, 2007 BibTeX DOI
  • Analysis of the MPI-IO Optimization Levels with the PIOViz Jumpshot Enhancement (Thomas Ludwig, Stephan Krempel, Michael Kuhn, Julian Kunkel, Christian Lohse), In Recent Advances in Parallel Virtual Machine and Message Passing Interface, Lecture Notes in Computer Science (4757), pp. 213–222, (Editors: Franck Cappello, Thomas Hérault, Jack Dongarra), Springer (Berlin / Heidelberg, Germany), Institut national de recherche en informatique et automatique, EuroPVM/MPI-07, Paris, France, ISBN: 978-3-540-75415-2, 2007 BibTeX URL DOI

2006

  • Tracing the MPI-IO Calls' Disk Accesses (Thomas Ludwig, Stephan Krempel, Julian Kunkel, Frank Panse, Dulip Withanage), In Recent Advances in Parallel Virtual Machine and Message Passing Interface, Lecture Notes in Computer Science (4192), pp. 322–330, (Editors: Bernd Mohr, Jesper Larsson Träff, Joachim Worringen, Jack Dongarra), Springer (Berlin / Heidelberg, Germany), C&C Research Labs, NEC Europe Ltd., and the Research Centre Jülich, EuroPVM/MPI-06, Bonn, Germany, ISBN: 3-540-39110-X, 2006 BibTeX URL DOI

Talks

2021

2020

2019

2018

2017

2016

  • BoF: The Virtual Institute for I/O and the IO-500 (Dr. Julian Kunkel), Supercomputing Conference, Salt Lake City, USA, 2016-11-17 Presentation
  • Statistical File Characterization and Status Update: Monitoring at DKRZ (Dr. Julian Kunkel), BoF: Analyzing Parallel I/O, Supercomputing Conference, Salt Lake City, USA, 2016-11-17 Presentation
  • Middleware for Earth System Data (Dr. Julian Kunkel), PDSW-DISC Workshop, Salt Lake City, USA, 2016-11-14 Presentation
  • MPI-IO In-Memory Storage with the Kove XPD (Dr. Julian Kunkel), PDSW-DISC Workshop, Salt Lake City, USA, 2016-11-14 Presentation
  • Performance Conscious HPC (PeCoH) Kickoff (Dr. Julian Kunkel), PeCoH Kickoff, Hamburg, Germany, 2016-08-22 Presentation
  • Additional I/O Considerations (Dr. Julian Kunkel), Bull cooperation meeting, Grenoble, France, 2016-07-04 Presentation
  • Analyzing Data Properties Using Statistical Sampling Techniques – Illustrated on Scientific File Formats and Compression Features (Dr. Julian Kunkel), HPC-IODC Workshop, Frankfurt, Germany, 2016-06-23 Presentation
  • Lustre at DKRZ (Dr. Julian Kunkel), Lustre BoF, ISC High Performance, Frankfurt, Germany, 2016-06-21 Presentation
  • Analyzing Data Properties Using Statistical Sampling Techniques – Illustrated on Scientific File Formats and Compression Features (Dr. Julian Kunkel), ISC High Performance, Frankfurt, Germany, 2016-06-21 Presentation
  • I/O Benchmarking (Dr. Julian Kunkel), JAMSTEC cooperation, Hamburg, Germany, 2016-06-17 Presentation
  • BoF: VI4IO: The I/O Community Hosting the High-Performance Storage List (Dr. Julian Kunkel), ISC High Performance, Frankfurt, Germany, 2016-06-15 Presentation
  • I/O Perspectives for Earth Science Data (Dr. Julian Kunkel), MPI-M/DKRZ joint I/O workshop, Hamburg, Germany, 2016-05-11 Presentation
  • Advanced Computation and I/O Methods for Earth-System Simulations (AIMES) (Dr. Julian Kunkel), SPPEXA annual symposium, Munich, Germany, 2016-01-27 Presentation
  • AIMES overview, contributions of WR to WPs (Dr. Julian Kunkel), AIMES kickoff meeting, Munich, Germany, 2016-01-27 Presentation
  • Compression (in HDF5) in the projects ICOMEX and AIMES (Dr. Julian Kunkel), Informal meeting, Hamburg, Germany, 2016-01-18 Presentation

2015

  • WP2: Efficient input/output of very large data sets (Dr. Julian Kunkel), Bull Cooperation Kickoff, Germany, 2015-12-02
  • Interaktiver C Kurs (ICP) (Dr. Julian Kunkel), Campus Innovation, Hamburg, Germany, 2015-11-27
  • SIOX: A flexible approach (Dr. Julian Kunkel), BoF: Analyzing Parallel I/O, Supercomputing Conference, Austin, USA, 2015-11-20 Presentation
  • Monitoring plans at DKRZ (Dr. Julian Kunkel), BoF: Analyzing Parallel I/O, Supercomputing Conference, Austin, USA, 2015-11-20 Presentation
  • Future CS Trends and IO (Dr. Julian Kunkel), Max-Planck-Institute for Meteorology Retreat, Germany, 2015-11-04
  • High-Performance I/O at Mistral (Dr. Julian Kunkel), DKRZ user workshop, Hamburg, Germany, 2015-10-06 Presentation
  • Mistral Supercomputer I/O (Dr. Julian Kunkel), CluStor Workshop, Hamburg, Germany, 2015-07-30 Presentation
  • Analyzing and Assessing I/O Performance (Dr. Julian Kunkel), CluStor Workshop, Hamburg, Germany, 2015-07-30 Presentation
  • Predicting Performance of Non-Contiguous I/O with Machine Learning (Dr. Julian Kunkel), International Supercomputing Conference, Frankfurt, Germany, 2015-07-16 Presentation
  • I/O at the German Climate Computing Center (Dr. Julian Kunkel), International Supercomputing Conference, Frankfurt, Germany, 2015-07-16 Presentation
  • Advanced Computation and I/O Methods for Earth-System Simulations (AIMES) (Dr. Julian Kunkel), SPPEXA applicant colloquium, Bonn, Germany, 2015-05-05 Presentation
  • Domain-specific Language Development (Dr. Julian Kunkel), Group seminar, University of Hamburg, Hamburg, Germany, 2015-02-23 Presentation

2014

  • Challenges in HPC I/O (Dr. Julian Kunkel), University of Basel, Basel, Switzerland, 2014-10-10 Presentation
  • Monitoring Energy Consumption With SIOX – Autonomous Monitoring Triggered by Abnormal Energy Consumption (Dr. Julian Kunkel), Energy-Aware High Performance Computing Conference, Dresden, Germany, 2014-09-02 Presentation
  • The SIOX Architecture – Coupling Automatic Monitoring and Optimization of Parallel I/O (Dr. Julian Kunkel), International Supercomputing Conference, Leipzig, 2014-06-26 Presentation
  • Deficiencies in I/O and the Future with E10 (Dr. Julian Kunkel), EOFS breakfast meeting, International Supercomputing Conference, Leipzig, Germany, 2014-06-25 Presentation
  • Exascale 10 – High-Level Architecture (Dr. Julian Kunkel), BoF: Towards Exascale I/O with E10, International Supercomputing Conference, Leipzig, Germany, 2014-06-25 Presentation
  • Introductions to the SIOX Architecture (Dr. Julian Kunkel), BoF: Autonomic I/O Optimization, International Supercomputing Conference, Leipzig, Germany, 2014-06-23 Presentation
  • Exascale 10 – High-Level Architecture (Dr. Julian Kunkel), CluStor I/O Workshop, Hamburg, Germany, 2014-06-19 Presentation
  • Advancing Independent Non-Contiguous I/O (Dr. Julian Kunkel), CluStor I/O Workshop, Hamburg, Germany, 2014-06-19 Presentation
  • Hochleistungsrechnen: Einblicke in Leistungsanalyse und Speichersysteme der Zukunft (Dr. Julian Kunkel), Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Germany, 2014-05-30 Presentation
  • I/O Interfaces Will Change – Chance or Curse for Programmers? (Dr. Julian Kunkel), ICOMEX project meeting, Offenbach, Germany, 2014-05-15 Presentation
  • ICOMEX (Dr. Julian Kunkel), G8 Initiative – Final Review Meeting, Princeton, USA, 2014-05-12 Presentation
  • Challenges in Understanding, Optimizing and Procuring Storage Systems (Dr. Julian Kunkel), CSCS Storage Workshop, Lugano, Switzerland, 2014-05-09 Presentation
  • Lessions learned from G8 ICOMEX: ICOsahedral-grid Models for Exascale Earth System Simulations (Dr. Julian Kunkel), ENES Workshop on Exascale Technologies and Innovation in HPC for Climate Models, Hamburg, Germany, 2014-04-06 Presentation
  • Monitoring, Simulation and Autonomous Optimization of Parallel I/O (Dr. Julian Kunkel), Zentrum für Datenverarbeitung, Johannes Gutenberg Universität, Mainz, Germany, 2014-02-12

2013

  • Guiding Parallel I/O – The Semantical Gap (Dr. Julian Kunkel), ZKI-Tagung AK Supercomputing, Darmstadt, Germany, 2013-10-10 Presentation
  • Monitoring and Optimization of I/O-Performance with SIOX (Dr. Julian Kunkel), HPC-Status-Konferenz der Gauß-Allianz, Dresden, Germany, 2013-09-05 Presentation
  • Using Simulation to Validate Performance of MPI(-IO) Implementations (Dr. Julian Kunkel), International Supercomputing Conference, Leipzig, Germany, 2013-05-20 Presentation
  • Towards Intelligent Self-Optimisation in HPC I/O (Dr. Julian Kunkel), Exascale10/EIOW satellite event, International Supercomputing Conference, Leipzig, Germany, 2013-05-20 Presentation
  • Ganzheitliches Verständnis von Nutzungs- und Systemverhalten als Zugang zu effizienterem Hochleistungsrechnen (Dr. Julian Kunkel), Paderborn Center for Parallel Computing, Paderborn, 2013-05-05 Presentation

2012

  • EXIOS – Unified Exascale I/O System (Dr. Julian Kunkel), SPPEXA applicant colloquium, Bonn, Germany, 2012-07-09 Presentation
  • Simulating Parallel Programs on Application and System Level (Dr. Julian Kunkel), International Supercomputing Conference, Hamburg, Germany, 2012-06-18 Presentation
  • Towards a Unified Exascale I/O System (Dr. Julian Kunkel), IS-ENES I/O Workshop, Hamburg, Germany, 2012-02-28 Presentation
  • WiP: Simulating Application and System Interaction with PIOsimHD (Dr. Julian Kunkel), PDP 2012, Munich, Germany, 2012-02-17 Presentation
  • Modeling the I/O Path with a Functional Representation of Parallel File System and Hardware Architecture (Dr. Julian Kunkel), PDP 2012, Munich, Germany, 2012-02-16 Presentation

2011

2010

  • Collecting Energy Consumption of Scientific Data (Dr. Julian Kunkel), International Conference on Energy-Aware High Performance Computing, Hamburg, Deutschland, 2010-09-17 Presentation
  • Ansätze zum Monitoring hierarchischer E/A-Systeme (Dr. Julian Kunkel), ZKI-Arbeitskreis Supercomputing, Hamburg, Germany, 2010-03-04 Presentation

2009

2008

  • Bottleneck Detection in Parallel File Systems with Trace-Based Performance Monitoring (Dr. Julian Kunkel), Euro-Par 2008, Gran Canaria, Spain, 2008-08-29 Presentation

2007

  • Performance Evaluation of the PVFS2 Architecture (Dr. Julian Kunkel), Euromicro Conference on Parallel, Distributed and Network-based Processing, Naples, Italy, 2007-02-08 Presentation

2006

  • Performance Analysis of Parallel File Systems (Dr. Julian Kunkel), CluStor 2006, Heidelberg, Germany, 2006-09-21
  • Migration and Load Balancing Within PVFS2 (Dr. Julian Kunkel), CluStor 2006, Heidelberg, Germany, 2006-09-21

Supervised Theses

2022

  • Interactive Data Center Digital Twin using Virtual Reality, Lars Quentin (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2022-12-15, Thesis BibTeX
  • The Potential of Serverless Kubernetes-Based FaaS Platforms for Scientific Computing Workloads, Jonathan Decker (Master's Thesis), Advisors: Dr. Julian Kunkel, 2022-01-31, BibTeX URL

2021

  • Open source vehicle ECU diagnostics and testing platform, Ashcon Mohseninia (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2021-04-29, Thesis BibTeX

2019

  • Beamer Slide Composition, Joseph Dyer (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2019-06-09, Thesis BibTeX
  • Recognition of Company Mergers Using Interactive Labeling and Machine Learning Methods, Anne Lorenz (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Doris Birkefeld, 2019-05-08, Thesis BibTeX
  • Accessibility Assistance for the Interactive Navigation of Texts, Imad Hamoumi (Master's Thesis), Advisors: Patricio Farrell, Dr. Julian Kunkel, 2019-01-28, Thesis BibTeX
  • Entwicklung eines computergesteuerten Akteurs für das kooperative Spielen in einem dyadischen Geschicklichkeitsspiel, Melanie Budde (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2019-01-17, Thesis BibTeX

2018

  • Comparing Naïve Bayesian Networks to Support Vector Machines to predict Stock Prices Based on Press Release Sentiment, Max Lübbering (Master's Thesis), Advisors: Dr. Julian Kunkel, Patricio Farrell, 2018-12-04, Thesis BibTeX
  • Understanding Customer Behaviour to Optimize Product Sorting for E-Commerce Websites, Amina Voloder (Master's Thesis), Advisors: Dr. Julian Kunkel, Antonia Wrobel, 2018-08-07, Thesis BibTeX
  • Comparison of Compiler’s Intermediate Representations and Input/Output Access Patterns with String Kernels, Raul Torres (PhD's Thesis), Advisors: Thomas Ludwig, Dr. Julian Kunkel, Manuel F. Dolz, 2018-06-18, Thesis BibTeX
  • Large-Scale Accessibility Analysis Using OpenStreetMap Data, Martin Poppinga (Master's Thesis), Advisors: Dr. Julian Kunkel, 2018-06-06, Thesis BibTeX
  • Vector Folding for Icosahedral Earth System Models, Jonas Tietz (Bachelor's Thesis), Advisors: Nabeeh Jumah, Dr. Julian Kunkel, 2018-03-26, Thesis BibTeX
  • Enabling Single Process Testing of MPI in Massive Parallel Applications, Tareq Kellyeh (Master's Thesis), Advisors: Dr. Julian Kunkel, Christian Hovy, 2018-03-20, Thesis BibTeX
  • Modeling and Performance Prediction of HDF5 data on Objectstorage, Roman Jerger (Master's Thesis), Advisors: Dr. Julian Kunkel, Jakob Lüttgau, 2018-03-15, Thesis BibTeX

2017

  • Verarbeitung von Klimadaten mit Big-Data-Werkzeugen, Alexander Erhardt (Master's Thesis), Advisors: Dr. Julian Kunkel, 2017-07-31, Thesis BibTeX
  • Interactive Recommender Systems For A Professional Social Network, Mirko Köster (Master's Thesis), Advisors: Dr. Julian Kunkel, 2017-06-09, Thesis BibTeX
  • In-situ Transformation for Input/Output Access Patterns by Applying Building Blocks of Optimization Schemas, Daniel Schmidtke (Master's Thesis), Advisors: Dr. Julian Kunkel, 2017-04-19, Thesis BibTeX
  • Extracting Semantic Relations from Wikipedia using Spark, Hans Ole Hatzel (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2017-02-02, Thesis BibTeX

2016

  • Adaptive Selection of Lossy Compression Algorithms Using Machine Learning, Armin Schaare (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Anastasiia Novikova, 2016-11-29, Thesis BibTeX
  • Evaluation von alternativen Speicherszenarien für hierarchische Speichersysteme, Marc Perzborn (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2016-10-31, Thesis BibTeX
  • Quality Control of Meteorological Time-Series with the Aid of Data Mining, Jennifer Truong (Master's Thesis), Advisors: Dr. Julian Kunkel, 2016-10-30, Thesis BibTeX
  • Characterizing Literature Using Machine Learning Methods, Jan Bilek (Master's Thesis), Advisors: Dr. Julian Kunkel, 2016-10-14, Thesis BibTeX
  • Untersuchung von Interaktiven Analyse- und Visualisierungsumgebungen im Browser für NetCDF-Daten, Sebastian Rothe (Master's Thesis), Advisors: Dr. Julian Kunkel, 2016-07-21, Thesis BibTeX
  • Automation of manual code optimization via DSL-directed AST-manipulation, Jonas Gresens (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2016-06-27, Thesis BibTeX
  • Modeling and Simulation of Tape Libraries for Hierarchical Storage Management Systems, Jakob Lüttgau (Master's Thesis), Advisors: Dr. Julian Kunkel, 2016-04-09, Thesis Presentation BibTeX

2015

2014

  • Halbautomatische Überprüfung von kollektiven MPI-Operationen zur Identifikation von Leistungsinkonsistenzen, Sebastian Rothe (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2014-04-09, Thesis BibTeX
  • Analyse und Optimierung von nicht-zusammenhängende Ein-/Ausgabe in MPI, Daniel Schmidtke (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Michaela Zimmer, 2014-04-07, Thesis BibTeX
  • Automatic Analysis of a Supercomputer's Topology and Performance Characteristics, Alexander Bufe (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2014-03-18, Thesis BibTeX
  • Flexible Event Imitation Engine for Parallel Workloads, Jakob Lüttgau (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2014-03-18, Thesis BibTeX

2012

  • Effiziente Verarbeitung von Klimadaten mit ParStream, Moritz Lahn (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2012-06-28, BibTeX
  • Replay Engine for Application Specific Workloads, Jörn Ahlers (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, 2012-04-12, Thesis BibTeX

2010

  • Crossmedia File System MetaFS – Exploiting Performance Characteristics from Flash Storage and HDD, Leszek Kattinger (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Olga Mordvinova, 2010-03-23, Thesis BibTeX Sources

2009

  • Tracing Internal Behavior in PVFS, Tien Duc Tien (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Thomas Ludwig, 2009-10-05, Thesis BibTeX
  • Simulation-Aided Performance Evaluation of Input/Output Optimizations for Distributed Systems, Michael Kuhn (Master's Thesis), Advisors: Dr. Julian Kunkel, Thomas Ludwig, 2009-09-30, Thesis BibTeX URL
  • Design and Implementation of a Profiling Environment for Trace Based Analysis of Energy Efficiency Benchmarks in High Performance Computing, Stephan Krempel (Master's Thesis), Advisors: Dr. Julian Kunkel, Thomas Ludwig, 2009-08-31, Thesis BibTeX
  • Model and simulation of power consumption and power saving potential of energy efficient cluster hardware, Timo Minartz (Master's Thesis), Advisors: Dr. Julian Kunkel, Thomas Ludwig, 2009-08-27, Thesis BibTeX URL

2008

  • Ergebnisvisualisierung paralleler Ein/Ausgabe Simulation im Hochleistungsrechnen, Anton Ruff (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Thomas Ludwig, 2008-05-31, BibTeX

2007

  • Container-Archiv-Format für wahlfreien effizienten Zugriff auf Dateien, Hendrik Heinrich (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Thomas Ludwig, 2007-09-30, Thesis BibTeX
  • Directory-Based Metadata Optimizations for Small Files in PVFS, Michael Kuhn (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Thomas Ludwig, 2007-09-03, Thesis BibTeX URL
  • Benchmarking of Non-Blocking Input/Output on Compute Clusters, David Büttner (Bachelor's Thesis), Advisors: Dr. Julian Kunkel, Thomas Ludwig, 2007-04-24, Thesis BibTeX URL

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