Uhmmm, what is "MPI_Free()"? It does not appear to be part of the MPI2 standard. MPI_Free_mem() is part of the standard, but is used in conjunction with MPI_Alloc_mem() and doesn't seem to refer to what you are describing here.
Is it a local procedure and if so, what does it do? -bill From: beowulf-boun...@beowulf.org [mailto:beowulf-boun...@beowulf.org] On Behalf Of amjad ali Sent: Saturday, June 26, 2010 4:12 PM To: Beowulf Mailing List Subject: [Beowulf] MPI Persistent Comm Question Hi all, What is the be the best way of using MPI persistent communication in an iterative/repetative kind of code about calling MPI_Free(); Should we call MPI_Free() in every iteration or only once when all the iterations/repetitions are performed? Means which one is the best out of following two: (1) Call this subroutines 1000 times ============================= call MPI_RECV_Init() call MPI_Send_Init() call MPI_Startall() call MPI_Free() ============================= (2) Call this subroutines 1000 times =========================== call MPI_RECV_Init() call MPI_Send_Init() call MPI_Startall() ========================== call MPI_Free() --------- call it only once at the end. Thanks in advance. best regards AA
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