Scripted HTML version of Foils prepared 11 November 1996

Foil 26 Implementation of SHIFT in MPI

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 144
We can implement MPSHIFT directly in MPI as CALL MPI_SENDRECV(SOURCE,1,MPI_REAL, PROCNUM+1, sendtag, DEST,1,MPI_REAL, PROCNUM-1, recvtag,comm,status)
Notes:
MPI_REAL denotes that variable is real
"sendtag/recvtag" are for this purpose, a largely irrelevant additional message tag
"comm" is extra system message tag defining "scope" -- i.e. the set of processors involved -- here it is all of them
"status" tells you about received data. You needn't look at it if you trust your code and hardware

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