[Beowulf] MPI Persistent Comm Question

[amjad ali]

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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