[mpiwg-hybridpm] Hybrid telecon fiasco

[Balaji, Pavan]

On Apr 7, 2014, at 1:32 PM, Jim Dinan <james.dinan at gmail.com> wrote:
> That is another option...  Consider a case with cooperatively scheduled user-level threads.  It could be hard to meet the concurrency requirement for collectives even if you have MPI_THREAD_MULTIPLE.

FWIW, MPI_THREAD_MULTIPLE is required to work correctly even with cooperatively scheduled user-level threads.  The MPI implementation is required to yield appropriately within each blocking call.  E.g., both threads do MPI_RECV.

  — Pavan