On Sep 16, 2009, at 9:53 PM, Ralph Castain wrote:
> Only the obvious, and not very helpful one: comm_spawn isn't thread
> safe at this time. You'll need to serialize your requests to that
This is likely the cause of your issues if you are calling
MPI_COMM_SPAWN in multiple threads simultaneously. Can you verify?
If not, we'll need to dig a little deeper to figure out what's going
on. But Ralph is right -- read up on the THREAD_MULTIPLE constraints
(check the OMPI README file) to see if that's what's biting you.