Section: Software
ForestGOMP
Participants : Olivier Aumage, Yannick Martin, Pierre-André Wacrenier.
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ForestGOMP is an OpenMP environment based on both the GNU OpenMP run-time and the Marcel thread library.
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It is designed to schedule efficiently nested sets of threads (derived from nested parallel regions) over hierarchical architectures so as to minimize cache misses and NUMA penalties.
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The ForestGOMP runtime generates nested Marcel bubbles each time an OpenMP parallel region is encountered, thereby grouping threads sharing common data.
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Topology-aware scheduling policies implemented by BubbleSched can then be used to dynamically map bubbles onto the various levels of the underlying hierarchical architecture.
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ForestGOMP allowed us to validate the BubbleSched approach with highly irregular, fine grain, divide-and-conquer parallel applications.