[mpich-discuss] What is the difference between MPI_THREAD_SINGLE and MPI_THREAD_FUNNELED

Boisvert, Sebastien boisvert at anl.gov
Fri May 30 10:49:13 CDT 2014

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 ?

Thanks a ton !

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