OpenMP and NUMA relation?

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I have a dual socket Xeon E5522 2.26GHZ machine (with hyperthreading disabled) running ubuntu server on linux kernel 3.0 supporting NUMA. The architecture layout is 4 physical cores per socket. An OpenMP application runs in this machine and i have the following questions:

  1. Does an OpenMP program take advantage (i.e a thread and its private data are kept on a numa node along the execution) automatically when running on a NUMA machine + aware kernel?. If not, what can be done?

  2. what about NUMA and per thread private C++ STL data structures ?

numa openmp smp parallel-processing c++
2 Answers

You can also check you make your memory placement and access in the right way with a new tool to profile NUMA applications and now open-source for Linux : NUMAPROF : https://memtt.github.io/numaprof/.

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