Yes, see https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/420 Rajeev On Dec 5, 2014, at 9:41 AM, Timothy Brown <[email protected]> wrote:

Hello.

I was trying to use MPI_Neighbor_alltoallw() and was following the example on page 333 of the MPI-3.0 standard. However I believe the send and receive counts are incorrect. Lines 21 to 25:

DO i=1,num_neigh sndcounts(i) = 100 rcvcounts(i) = 100 rcvtypes(i) = sndtypes(i) END DO

Since the send/receive counts for 1 and 2 are vectors types of length 100, we should be sending/receiving only 1 type/element. As follows:

sndcounts(1) = 1 sndcounts(2) = 1 sndcounts(3) = 100 sndcounts(4) = 100

rcvcounts = sndcounts

Indeed if I compile the example as per the standard, I get data corruption.

I couldn't find this in the errata published on May 14, 2014. However if it is a known mistake please ignore my comment.

Regards Timothy Brown _______________________________________________ mpi-comments mailing list [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-comments