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Subject: [OMPI users] Open-MPI maffinity policy
From: Qasim Ali (qasimali_at_[hidden])
Date: 2011-06-30 21:31:09

Hi folks,

I installed open-mpi with the libnuma library using the --with-libnuma.
Everything installed fine. When I do

./ompi_info |grep maffinity
           MCA maffinity: first_use (MCA v2.0, API v2.0, Component v1.4.2)
           MCA maffinity: libnuma (MCA v2.0, API v2.0, Component v1.4.2)

I see two policies here. first_use and libnuma

I have two questions regarding these:
1. Which policy will be used in my MPI application?
2. Do I have to specify maffinity when using mpirun command or the open-mpi
runtime will automatically use the allocation policy (first_use or libnuma?)