Ah! Are you using MPI-thread-multiple? Sent from my phone. No type good.
On Sep 14, 2011, at 5:28 AM, "devendra rai" <rai.deven...@yahoo.co.uk> wrote: > Hello MPI Forum, Jeff > > Well, the problem is not with incorrect arguments with MPI_Ssend(...) and/or > MPI_Recv(...). I confirmed this. Also, if there were any obvious programming > and logical errors, I would never have any successful run. In fact, I am > having some runs which go through successfully. > > The problem seems to be random, and therefore, I am finding it hard to debug. > I am using Open MPI v. 1.4.3, on Linux kernel 2.6.37.6-0.7. > > I am also using tags, in addition to normal sender node and receiver nodes. I > am using integers for tags, and none of the tags are more than 1000. I am > also running MPI_Ssends and MPI_Recv within pthreads, and I believe that it > should be okay. > > So, the question is, am I stumbling across a bug, or an incorrect MPI > installation? > > Thanks a lot. > > Best > > Devendra > > From: Jeff Squyres <jsquy...@cisco.com> > To: devendra rai <rai.deven...@yahoo.co.uk>; Open MPI Users > <us...@open-mpi.org> > Sent: Tuesday, 13 September 2011, 16:13 > Subject: Re: [OMPI users] Question on MPI_Ssend > > On Sep 13, 2011, at 8:41 AM, devendra rai wrote: > > > Also, I read the definition of MPI_Ssend(...) that you sent, but then it > > does not explain why both MPI_Ssend(...) and MPI_Recv(...) are blocked > > seemingly forever. > > Oh, they're blocked *forever*! Sorry; I didn't get that from your prior > description -- I thought you just wanted non-blocking instead of blocking. > > > I notice that such a block happens when MPI_Recv(...) is posted before > > MPI_Ssend(...). > > It doesn't matter if the receive is posted before the send or the other way > around. > > When blocking sends/receives block forever, it usually means that there's a > mismatch in the communicator, tag, or src/dest arguments between the two. > > -- > Jeff Squyres > jsquy...@cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > >
