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Performance study of multithreaded MPI and Openmp tasking in a large scientific code
KTH, School of Computer Science and Communication (CSC), Computational Science and Technology (CST).
KTH, School of Computer Science and Communication (CSC), Computational Science and Technology (CST).
KTH, School of Computer Science and Communication (CSC), Computational Science and Technology (CST).ORCID iD: 0000-0002-2792-1622
KTH, School of Computer Science and Communication (CSC), Computational Science and Technology (CST).
2017 (English)In: Proceedings - 2017 IEEE 31st International Parallel and Distributed Processing Symposium Workshops, IPDPSW 2017, Institute of Electrical and Electronics Engineers (IEEE), 2017, 756-765 p., 7965119Conference paper, Published paper (Refereed)
Abstract [en]

With a large variety and complexity of existing HPC machines and uncertainty regarding exact future Exascale hardware, it is not clear whether existing parallel scientific codes will perform well on future Exascale systems: they can be largely modified or even completely rewritten from scratch. Therefore, now it is important to ensure that software is ready for Exascale computing and will utilize all Exascale resources well. Many parallel programming models try to take into account all possible hardware features and nuances. However, the HPC community does not yet have a precise answer whether, for Exascale computing, there should be a natural evolution of existing models interoperable with each other or it should be a disruptive approach. Here, we focus on the first option, particularly on a practical assessment of how some parallel programming models can coexist with each other. This work describes two API combination scenarios on the example of iPIC3D [26], an implicit Particle-in-Cell code for space weather applications written in C++ and MPI plus OpenMP. The first scenario is to enable multiple OpenMP threads call MPI functions simultaneously, with no restrictions, using an MPI THREAD MULTIPLE thread safety level. The second scenario is to utilize the OpenMP tasking model on top of the first scenario. The paper reports a step-by-step methodology and experience with these API combinations in iPIC3D; provides the scaling tests for these implementations with up to 2048 physical cores; discusses occurred interoperability issues; and provides suggestions to programmers and scientists who may adopt these API combinations in their own codes.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017. 756-765 p., 7965119
Keyword [en]
API interoperability, Exascale, MPI-THREAD-MULTIPLE thread safety, multithreaded MPI, OpenMP tasks, performance, programming models
National Category
Computer Systems
Identifiers
URN: urn:nbn:se:kth:diva-213532DOI: 10.1109/IPDPSW.2017.128ISI: 000417418900084Scopus ID: 2-s2.0-85028041248ISBN: 9781538634080 OAI: oai:DiVA.org:kth-213532DiVA: diva2:1137842
Conference
31st IEEE International Parallel and Distributed Processing Symposium Workshops, IPDPSW 2017, Orlando, United States, 29 May 2017 through 2 June 2017
Funder
EU, Horizon 2020, 671602
Note

QC 20170901

Available from: 2017-09-01 Created: 2017-09-01 Last updated: 2018-01-16Bibliographically approved

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Akhmetova, DanaIakymchuk, RomanEkeberg, ÖrjanLaure, Erwin
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