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Subject: [OMPI users] Broadcast problem
From: Randolph Pullen (randolph_pullen_at_[hidden])
Date: 2013-04-30 02:43:23

I have a number of processes split into sender and receivers. Senders read large quantities of randomly organised data into buffers for transmission to receivers. When a buffer is full it needs to be transmitted to all receivers this repeats until all the data is transmitted. Problem is that MPI_Bcast must know the root it is to receive from and therefore cant receive 'blind' from the first full sender. Scatter would be inneffieienct because a few senders wont have anything to send - so its wasteful to transmit those empty buffers repeatedly.  Any ideas? Can Bcast recievers be promiscuous? Thanks Randolph