[mvapich-discuss] How to verify that hwloc is enabled and used

[Craig Tierney]

I am trying to run some openmp/mpi hybrid applications and the
performance is not good.  The first place to blame is affinity (since
the same code with Intel MPI and SGI MPI behave as I would want).  I
have run taskset -p $PID on some running processes and I see that the
mask is ffff, indicating that those processes have no affinity.  I
have tried lots of combinations of MV2_CPU_MAPPING,
MV2_CPU_BINDING_POLICY, MV2_CPU_BINDING_LEVEL and I get no indication
of any affinity.  I am looking back at my build, I see the message "no
suitable hwloc found, using internal version".  But is there a way to
verify that that is even working?

Thanks,
Craig