[mpich-discuss] MPI_THREAD_FUNNELED

[Jed Brown]

As far as I know, this only causes locking around some potentially unsafe
system calls. My concern is that we usually don't know whether the user is
asking for threads until we have processed run-time options, which is
normally done after calling MPI_Init_thread(). Is there a downside to
asking for MPI_THREAD_FUNNELED even if only MPI_THREAD_SINGLE semantics
will be needed?
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