Thank you Jeff for the clarification. Saliya
On Fri, Feb 14, 2014 at 7:06 AM, Jeff Squyres (jsquyres) <jsquy...@cisco.com > wrote: > On Feb 13, 2014, at 10:59 PM, Saliya Ekanayake <esal...@gmail.com> wrote: > > > Anyway, to answer your question I was trying to do sendrecv in a chain > where "toSend" and "receiveFrom" ranks are not the same. I was using a > single buffer, which resulted in cases where the buffer content got > replaced with received values before being able to send its original > content. I think it was an error on my side to use a single buffer in a > pipeline sendrecev. I fixed it by having two buffers. > > That is correct: MPI_SENDRECV does not guarantee any ordering. > > > I guess still with MPI_IN_PLACE this could happen. Please correct me > here if I am wrong. > > That is also correct. You could, however, use MPI_SENDRECV_REPLACE. It's > not much more efficient than providing your own two buffers (i.e., OMPI > will alloc a temporary receive buffer, and when the send is done, it'll > copy from the temp to the send buffer). > > -- > 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 > -- Saliya Ekanayake esal...@gmail.com Cell 812-391-4914 Home 812-961-6383 http://saliya.org
