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A task parallel implementation of an RBF-generated finite difference method for the shallow water equations on the sphere
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Scientific Computing. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computational Science.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Scientific Computing. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Numerical Analysis.
2014 (English)Report (Other academic)
Place, publisher, year, edition, pages
2014.
Series
Technical report / Department of Information Technology, Uppsala University, ISSN 1404-3203 ; 2014-011
National Category
Computer Science Computational Mathematics
Identifiers
URN: urn:nbn:se:uu:diva-221156OAI: oai:DiVA.org:uu-221156DiVA: diva2:707881
Projects
eSSENCEUPMARC
Available from: 2014-04-03 Created: 2014-03-25 Last updated: 2014-04-29Bibliographically approved
In thesis
1. Scientific Computing on Multicore Architectures
Open this publication in new window or tab >>Scientific Computing on Multicore Architectures
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Computer simulations are an indispensable tool for scientists to gain new insights about nature. Simulations of natural phenomena are usually large, and limited by the available computer resources. By using the computer resources more efficiently, larger and more detailed simulations can be performed, and more information can be extracted to help advance human knowledge.

The topic of this thesis is how to make best use of modern computers for scientific computations. The challenge here is the high level of parallelism that is required to fully utilize the multicore processors in these systems.

Starting from the basics, the primitives for synchronizing between threads are investigated. Hardware transactional memory is a new construct for this, which is evaluated for a new use of importance for scientific software: atomic updates of floating point values. The evaluation includes experiments on real hardware and comparisons against standard methods.

Higher level programming models for shared memory parallelism are then considered. The state of the art for efficient use of multicore systems is dynamically scheduled task-based systems, where tasks can depend on data. In such systems, the software is divided up into many small tasks that are scheduled asynchronously according to their data dependencies. This enables a high level of parallelism, and avoids global barriers.

A new system for managing task dependencies is developed in this thesis, based on data versioning. The system is implemented as a reusable software library, and shown to be as efficient or more efficient than other shared-memory task-based systems in experimental comparisons.

The developed runtime system is then extended to distributed memory machines, and used for implementing a parallel version of a software for global climate simulations. By running the optimized and parallelized version on eight servers, an equally sized problem can be solved over 100 times faster than in the original sequential version. The parallel version also allowed significantly larger problems to be solved, previously unreachable due to memory constraints.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. 47 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1139
Keyword
multicore, scientific computing, shared memory parallelism, task-based programming, parallel programming model, task scheduling, data versioning
National Category
Software Engineering Computational Mathematics
Research subject
Scientific Computing
Identifiers
urn:nbn:se:uu:diva-221241 (URN)978-91-554-8928-1 (ISBN)
Public defence
2014-05-23, Room 2446, Polacksbacken, Lägerhyddsvägen 2, Uppsala, 10:15 (English)
Opponent
Supervisors
Projects
UPMARCeSSENCE
Available from: 2014-04-29 Created: 2014-03-26 Last updated: 2014-06-30Bibliographically approved

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http://www.it.uu.se/research/publications/reports/2014-011/

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Tillenius, MartinLarsson, ElisabethLehto, Erik

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