On Mar 20, 2007, at 3:15 PM, Mike Houston wrote:
If I only do gets/puts, things seem to be working correctly with
version
1.2. However, if I have a posted Irecv on the target node and issue a
MPI_Get against that target, MPI_Test on the posed IRecv causes a
segfaults:
Anyone have suggestions? Sadly, I need to have IRecv's posted. I'll
attempt to find a workaround, but it looks like the posed IRecv is
getting all the data of the MPI_Get from the other node. It's like
the
message tagging is getting ignored. I've never tried posting two
different IRecv's with different message tags either...
Hi Mike -
I've spent some time this afternoon looking at the problem and have
some ideas on what could be happening. I don't think it's a data
mismatch (the data intended for the IRecv getting delivered to the
Get), but more a problem with the call to MPI_Test perturbing the
progress flow of the one-sided engine. I can see one or two places
where it's possible this could happen, although I'm having trouble
replicating the problem with any test case I can write. Is it
possible for you to share the code causing the problem (or some small
test case)? It would make me feel considerably better if I could
really understand the conditions required to end up in a seg fault
state.
Thanks,
Brian
