Jeff, I have another question. I thought MPI_Test is a local call, meaning it doesn't send/receive message. Am I misunderstanding something? Thanks again.
Best regards, Zhen On Thu, May 5, 2016 at 9:45 PM, Jeff Squyres (jsquyres) <jsquy...@cisco.com> wrote: > It's taking so long because you are sleeping for .1 second between calling > MPI_Test(). > > The TCP transport is only sending a few fragments of your message during > each iteration through MPI_Test (because, by definition, it has to return > "immediately"). Other transports do better handing off large messages like > this to hardware for asynchronous progress. > > Additionally, in the upcoming v2.0.0 release is a non-default option to > enable an asynchronous progress thread for the TCP transport. We're up to > v2.0.0rc2; you can give that async TCP support a whirl, if you want. Pass > "--mca btl_tcp_progress_thread 1" on the mpirun command line to enable the > TCP progress thread to try it. > > > > On May 4, 2016, at 7:40 PM, Zhen Wang <tod...@gmail.com> wrote: > > > > Hi, > > > > I'm having a problem with Isend, Recv and Test in Linux Mint 16 Petra. > The source is attached. > > > > Open MPI 1.10.2 is configured with > > ./configure --enable-debug --prefix=/home/<me>/Tool/openmpi-1.10.2-debug > > > > The source is built with > > ~/Tool/openmpi-1.10.2-debug/bin/mpiCC a5.cpp > > > > and run in one node with > > ~/Tool/openmpi-1.10.2-debug/bin/mpirun -n 2 ./a.out > > > > The output is in the end. What puzzles me is why MPI_Test is called so > many times, and it takes so long to send a message. Am I doing something > wrong? I'm simulating a more complicated program: MPI 0 Isends data to MPI > 1, computes (usleep here), and calls Test to check if data are sent. MPI 1 > Recvs data, and computes. > > > > Thanks in advance. > > > > > > Best regards, > > Zhen > > > > MPI 0: Isend of 0 started at 20:32:35. > > MPI 1: Recv of 0 started at 20:32:35. > > MPI 0: MPI_Test of 0 at 20:32:35. > > MPI 0: MPI_Test of 0 at 20:32:35. > > MPI 0: MPI_Test of 0 at 20:32:35. > > MPI 0: MPI_Test of 0 at 20:32:35. > > MPI 0: MPI_Test of 0 at 20:32:35. > > MPI 0: MPI_Test of 0 at 20:32:35. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:36. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:37. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:38. > > MPI 0: MPI_Test of 0 at 20:32:39. > > MPI 0: MPI_Test of 0 at 20:32:39. > > MPI 0: MPI_Test of 0 at 20:32:39. > > MPI 0: MPI_Test of 0 at 20:32:39. > > MPI 0: MPI_Test of 0 at 20:32:39. > > MPI 0: MPI_Test of 0 at 20:32:39. > > MPI 1: Recv of 0 finished at 20:32:39. > > MPI 0: MPI_Test of 0 at 20:32:39. > > MPI 0: Isend of 0 finished at 20:32:39. > > > > <a5.cpp>_______________________________________________ > > users mailing list > > us...@open-mpi.org > > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/users > > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/05/29085.php > > > -- > 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 > Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/05/29105.php >
