The extent should not be part of the decision, what matters is the amount of data to be pushed on the wire, and not it's span in memory.
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 >
