Dr. David Cronk Innovative Computing Lab University of ... - It works!
Dr. David Cronk Innovative Computing Lab University of ... - It works!
Dr. David Cronk Innovative Computing Lab University of ... - It works!
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Non-blocking Communication<br />
100 continue<br />
if (err .lt. Delta) goto 200<br />
do some computation<br />
do I = 0, npes<br />
if (I .ne. myrank)<br />
set up data to send<br />
call MPI_SEND (sdata(I), cnt, dtype, &<br />
I, tag, comm, ierr)<br />
endif<br />
enddo<br />
do I = 0, npes<br />
if (I .ne. myrank)<br />
set up data to recv<br />
call MPI_RECV (rdata(I), cnt, dtype, &<br />
I, tag, comm, status, ierr)<br />
endif<br />
enddo<br />
goto 100<br />
Clearly unsafe<br />
100 continue<br />
if (err .lt. Delta) goto 200<br />
do some computation<br />
do I = 0, npes<br />
if (I .ne. myrank)<br />
set up data to send<br />
call MPI_ISEND (sdata(I), cnt, dtype, &<br />
I, tag, comm, request, ierr)<br />
endif<br />
enddo<br />
do I = 0, npes<br />
if (I .ne. myrank)<br />
set up data to recv<br />
call MPI_RECV (rdata(I), cnt, dtype, &<br />
I, tag, comm, status, ierr)<br />
endif<br />
enddo<br />
goto 100<br />
May run out <strong>of</strong> handles<br />
<strong>David</strong> <strong>Cronk</strong> 69
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