On Oct 28, 2005, at 3:08 PM, Jeff Squyres wrote:
1. I'm concerned about the MPI_Reduce error -- that one shouldn't be
happening at all. We have table lookups for the MPI_Op/MPI_Datatype
combinations that are supposed to work; the fact that you're getting
this error means that HPCC is using a combination that falls outside
the pairs that are defined in the MPI standard. Sigh. But it's HPCC,
so we should support it ;-).
I'll eat crow on this one -- double checking the HPCC code, it looks
like they are doing reductions on MPI_LONG_LONG_INT, which is perfectly
legal (MPI_LONG_LONG_INT is not specifically mentioned in the
collectives section in MPI-1, but it's one of the "optional" C
datatypes, and falls within the spirit of the definition of "C integer"
in the collectives section). Despite having implementations for all
the relevant reductions in Open MPI, I forgot to add MPI_LONG_LONG_INT
into some MPI_Op cross-reference datatype tables, so MPI_Reduce didn't
think that those combinations were valid. Doh!
I just committed the fix for this on the trunk; everyone's asleep right
now, but I'll get a review of this code and get it committed on the 1.0
branch tomorrow. :-)
--
{+} Jeff Squyres
{+} The Open MPI Project
{+} http://www.open-mpi.org/
