Jeff, >> Or is it the number of elements that are expected to be received, and hence >> MPI_Test will tell me that the receive is not complete untill "count" number >> of elements have not been received? > > Yes.
Answering "Yes" this question might further the confusion there. The "count" argument specifies the *capacity* of the receive buffer and the receive operation (blocking or not) will complete successfully for any matching message with size up to "count", even for an empty message with 0 elements, and will produce an overflow error if the received message was longer and data truncation has to occur. On 20.08.2012, at 16:32, Jeff Squyres <jsquy...@cisco.com> wrote: > On Aug 20, 2012, at 5:51 AM, devendra rai wrote: > >> Is it the number of elements that have been received *thus far* in the >> buffer? > > No. > >> Or is it the number of elements that are expected to be received, and hence >> MPI_Test will tell me that the receive is not complete untill "count" number >> of elements have not been received? > > Yes. > >> Here's the reason why I have a problem (and I think I may be completely >> stupid here, I'd appreciate your patience): > [snip] >> Does anyone see what could be going wrong? > > Double check that the (sender_rank, tag, communicator) tuple that you issued > in the MPI_Irecv matches the (rank, tag, communicator) tuple from the sender > (tag and communicator are arguments on the sending side, and rank is the rank > of the sender in that communicator). > > When receives block like this without completing like this, it usually means > a mismatch between the tuples. > > -- > Jeff Squyres > jsquy...@cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Hristo Iliev, Ph.D. -- High Performance Computing, RWTH Aachen University, Center for Computing and Communication Seffenter Weg 23, D 52074 Aachen (Germany) Tel: +49 241 80 24367 -- Fax/UMS: +49 241 80 624367
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