Newsgroups: comp.parallel.mpi
From: stoclet@aquarium-3.NoSubdomain.NoDomain (Patrick STOCLET)
Subject: persistant communication & O2k
Organization: Universites Paris VI/Paris VII - France
Date: 23 May 1997 09:26:07 GMT
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Message-ID: <5m3nrf$1lr$1@vishnu.jussieu.fr>

hello, i have trouble in using the persistant commmunications 
routines , with a 2d processors grid 

when i use Irecv and blocking send in a non-torus way 
everything runs nicely .
Since my pattern of communications is fixed 
nearest neighbour in x,y 
I am trying to use now MPI_Start 
after MPI_send_init and MPI_recv_init  


My questions are 
1) shall i save any time by using MPI_start 
2) how can i check message size in case of persistant comm 
    

thanks for info 

patrick stoclet 
stoclet@cncpst.jussieu.fr