multithreading - Hyrbid MPI / OpenMP -

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i've been trying use openmpi openmp , when run try run 2 mpi processes , 4 threads on 1 machine, threads executed on same core @ 25% usage instead of on 4 separate cores. able fix using --enable-mpi-threads when building openmpi; having issue being duel cpu machine.

there 8 cores per processor, 2 processors in each server. if run 2 mpi processes , 8 threads fine long 2 processes started on separate processors, if try , 1 mpi process 16 threads reverts stacking every thread on 1 core.

has had experience running openmpi , openmp together?


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