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IAS-Seminar: Implementation strategies for Parareal in combination with spatial parallelization

Anfang
05.12.2012 16:00 Uhr
Ende
05.12.2012 17:00 Uhr
Veranstaltungsort
Jülich Supercomputing Centre, Rotunde, Geb. 16.4, R. 301
Referent
Dr. Daniel Ruprecht, Institute of Computational Science, University of Lugano, Switzerland
Inhalt
Time-parallel methods like Parareal or PFASST provide a possibility to introduce a new direction of parallelism in addition to commonly used spatial parallelization by domain decomposition. Implementations of such a space-time parallel approach mostly use MPI in space and time, distinguishing between both communication in time and space by defining corresponding MPI communicators. While straightforward to implement, this strategy requires communication of volume data by message passing. Using shared memory for the time parallelization can avoid this and reduce the memory footprint of the code. The talk will present a strategy for a hybrid implementation of Parareal with spatial parallelization, discuss issues like pipelining Parareal and the effects of different initializations of hybrid MPI and present numerical results.
Zeit
Mittwoch, 5. Dezember 2012, 16.00 Uhr
Ort
Jülich Supercomputing Centre, Rotunde, Geb. 16.4, R. 301

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