[mvapich-discuss] mpi_isend/recv in multi-threaded program

[Sandeep Gupta]

Hi All,
I had a simple question regarding using MPI with pthreads.
Can  multiple threads call MPI_Isend/Irecv?  That is is MPI_Isend/Irecv
thread-save.
Do I have to use THREAD_SUPPORT_MULTIPLE?
I am asking because i have found that MPI_send/recv under
THREAD_SUPPORT_MULTIPLE has huge impact on performance.
Other I like the convenience of writing program using
THREAD_SUPPORT_MULTIPLE.

Best,
Sandeep
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