Btw, MPI_Type_hvector(20000, 1, 0, MPI_INT, &type);
Is just a weird datatype. Because the stride is 0, this datatype a memory layout that includes 20000 times the same int. I'm not sure this was indeed intended... George. On Mon, Jan 19, 2015 at 12:17 AM, Gilles Gouaillardet < gilles.gouaillar...@iferc.org> wrote: > Adrian, > > i just fixed this in the master > ( > https://github.com/open-mpi/ompi/commit/d14daf40d041f7a0a8e9d85b3bfd5eb570495fd2 > ) > > the root cause is a corner case was not handled correctly : > > MPI_Type_hvector(20000, 1, 0, MPI_INT, &type); > > type has extent = 4 *but* size = 80000 > ob1 used to test only the extent to determine whether the message should > be sent inlined or not > extent <= 256 means try to send the message inline > that meant a fragment of size 80000 (which is greater than 65536 e.g. > max default size for IB) was allocated, > and that failed. > > now both extent and size are tested, so the message is not sent inline, > and it just works. > > Cheers, > > Gilles > _______________________________________________ > devel mailing list > de...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/devel > Link to this post: > http://www.open-mpi.org/community/lists/devel/2015/01/16798.php >
