[petsc-users] Setting thread affinities for multiple MPI tasks per node

[Jed Brown]

John Mousel <john.mousel at gmail.com> writes:

> If I want to use threading but launch multiple MPI processes per node is
> there a way to control the affinities on each socket of the node? I see
> -threadcomm_affinities, but the documentation is sparse and it's hard for
> me to see how a single list of core labels gets the job done for multiple
> MPI processes when the core labels are different on the different sockets.

For processes, use your mpiexec to set affinity

http://blogs.cisco.com/performance/process-affinity-in-ompi-v1-7-part-1/

https://wiki.mpich.org/mpich/index.php/Using_the_Hydra_Process_Manager (-bind-to -help)


My intent is to make (threadcomm) thread affinity number within the mask
offered by MPI.
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