Scripted HTML version of Foils prepared 11 November 1996

Foil 24 Implementation of MPSHIFT(+1, SOURCE,DEST)

From CPS615-Completion of MPI foilset and Application to Jacobi Iteration in 2D Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 7 November 96. by Geoffrey C. Fox *
Secs 63.3
Consider for example, shift to right
Then Processors 0 .. Nproc-2 Send to right
    • Processors 1 .. Nproc-1 Receive from left
We can't necessarily send all messages and then receive all messages. "Standard" send can be "blocking" i.e. will not return unless receive completed by destination processor. In this case, we can deadlock as all "hang" after send, waiting for receive
So we are more careful

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