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Subject: [OMPI users] MPI_Isend delay
From: dave fournier (davef_at_[hidden])
Date: 2011-07-14 17:50:07

I have a master-slave setup. I have noticed that when I send a message
from the master to the slave
processes using MPI_Isend it never gets sent until I encounter an
MPI_recv in the master process.
As a result rhe slave processes are wasting time waiting for the
message. If I use MPI_Send
instead of MPI_Isend all works fine. I don't understand what is going
on here.