What version of OMPI are you using? The behavior depends on the version...
On Apr 19, 2010, at 2:01 PM, Martin Siegert wrote:
> I am wondering what effects it will have when I configure openmpi
> with --enable-mpi-threads: we are using the TM interface to torque
> and therefore each MPI program gets assigned a certain number of cores
> on a set of nodes by the scheduler. If the MPI program now starts
> additional threads how does that work?
> - will this lead to an oversubscription of nodes
> - will the creation of additional threads fail, if the number of
> processes on a node has reached the process count on that node
> assigned through torque?
> How is this done properly?
> Martin Siegert
> Head, Research Computing
> WestGrid Site Lead
> IT Services phone: 778 782-4691
> Simon Fraser University fax: 778 782-4242
> Burnaby, British Columbia email: siegert_at_[hidden]
> Canada V5A 1S6
> users mailing list