Towards NUMA Support with Distance Information
Today most multi-socket shared memory systems exhibit a non- uniform memory architecture (NUMA). However, programming models such as OpenMP do not provide explicit support for that. To overcome this limitation, we propose a platform-independent approach to describe the system topology and to place threads on the hardware. A distance matrix provides system information and is used to allow for thread binding with user-defined strategies. We propose and implement means to query this information from within the program, so that expert users can take advantage of this knowledge, and demonstrate the usefulness of our approach with an application from the Fraunhofer Institute for Laser Technology in Aachen.
KeywordsShared Memory Reduction Operation Memory Bandwidth Distance Information System Topology
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