You should use MPI_THREAD_FUNNELED. MPI_THREAD_SINGLE should be used if your program has one thread total. Rajeev On May 30, 2014, at 10:49 AM, "Boisvert, Sebastien" <[email protected]> wrote:

Hi MPICH community:

With MPICH, if my MPI process has 10 threads (including the main thread) and only the main thread calls MPI functions, do I need to use MPI_THREAD_SINGLE or MPI_THREAD_FUNNELED when I invoke MPI_Init_thread ?

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