On Dec 26, 2013, at 1:38 AM, Madhawa Bandara <madawa911 at gmail.com> wrote: > Are you suggesting using non-blocking send/recv? On the master process, yes. On the slave, it won't matter. An alternative is to use MPI_ANY_SOURCE receive, but nonblocking is better. -- Pavan Balaji http://www.mcs.anl.gov/~balaji