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Subject: [OMPI users] pinning processes by default
From: Albert Solernou (albert.solernou_at_[hidden])
Date: 2014-05-23 09:19:08

after compiling and installing OpenMPI 1.8.1, I find that OpenMPI is
pinning processes onto cores. Although this may be
desirable on some cases, it is a complete disaster when runnning hybrid
OpenMP-MPI applications. Therefore, I want to disable this behaviour,
but don't know how.

I configured OpenMPI with:
  ./configure \
          --prefix=$OPENMPI_HOME \
          --with-psm \
          --with-tm=/system/software/arcus/lib/PBS/ \
          --enable-mpirun-prefix-by-default \

  ompi_info | grep paffinity
does not report anything. However,
  mpirun -np 2 --report-bindings ./wrk
reports bindings:
  [login3:04574] MCW rank 1 bound to socket 0[core 1[hwt 0-1]]:
  [login3:04574] MCW rank 0 bound to socket 0[core 0[hwt 0-1]]:
but they cannot be disabled as:
  mpirun -np 2 --bind-to-none ./wrk
  mpirun: Error: unknown option "--bind-to-none"

Any idea on what went wrong?


   Dr. Albert Solernou
   Research Associate
   Oxford Supercomputing Centre,
   University of Oxford
   Tel: +44 (0)1865 610631