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Subject: Re: [OMPI users] Multithreading applications with OMPI 1.7
From: Ralph Castain (rhc_at_[hidden])
Date: 2012-04-27 21:27:21

On Apr 27, 2012, at 5:20 PM, Jens Glaser wrote:

> Hi,
> we've tried to use a multithreaded application with a more recent trunk version (March 21) of OpenMPI. We need to use this version because of CUDA RDMA support. OpenMPI was binding all the threads to a single core, which is undesirable.
> In OpenMPI 1.5. there was an option --cpus-per-rank, which should have helped in this case, or --bind-to-none.

--cpus-per-rank is turned "off" at the moment - needs to be updated

--bind-to none is the appropriate syntax - that should be the default setting, unless you are specifying a binding policy somewhere in an MCA param.

see mpirun -h for the full list of options

> Unfortunately, these options are now gone and I couldn't figure out how to make it work with the newest version.
> Can anyone offer any hints on this?
> Thanks,
> Jens.
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