The reply chains have become intermingled, and there seems to be a lot of confusion on exactly what is being asked and what answers have already been provided. I'm sorry -- I'm unable to follow exactly where we are in this question.
Can you start a single new thread with an explicit description of what you are asking? On Dec 9, 2013, at 7:54 PM, ???? <781578...@qq.com> wrote: > it means that only three 3 processors have worked,and other processors have > done nothing.why? > > > ------------------ ???????? ------------------ > ??????: "Ralph Castain";<r...@open-mpi.org>; > ????????: 2013??12??9??(??????) ????11:18 > ??????: "Open MPI Users"<us...@open-mpi.org>; > ????: Re: [OMPI users]?????? ?????? can you help me please ?thanks > > Forgive me, but I have no idea what that output means. Why do you think only > 3 processors are being used? > > On Dec 9, 2013, at 5:05 AM, ???? <781578...@qq.com> wrote: > >> I have a server with 12 cores.when I run mpi program with 10 >> processors.only three processors works.Here are a picture about the problem >> >> <40f6d...@e690af16.27c0a552.jpg> >> >> why?Is the problem with process schedule?? >> ------------------ ???????? ------------------ >> ??????: "Bruno Coutinho";<couti...@dcc.ufmg.br>; >> ????????: 2013??12??6??(??????) ????11:14 >> ??????: "Open MPI Users"<us...@open-mpi.org>; >> ????: Re: [OMPI users]?????? can you help me please ?thanks >> >> Probably it was the changing from eager to rendezvous protocols as Jeff said. >> >> If you don't know what are these, read this: >> https://computing.llnl.gov/tutorials/mpi_performance/#Protocols >> http://blogs.cisco.com/performance/what-is-an-mpi-eager-limit/ >> http://blogs.cisco.com/performance/eager-limits-part-2/ >> >> You can tune eager limit chaning mca parameters btl_tcp_eager_limit (for >> tcp), btl_self_eager_limit (comunication fron one process to itself), >> btl_sm_eager_limit (shared memory) and btl_udapl_eager_limit or >> btl_openib_eager_limit (if you use infiniband). >> >> >> 2013/12/6 Jeff Squyres (jsquyres) <jsquy...@cisco.com> >> I sent you some further questions yesterday: >> >> http://www.open-mpi.org/community/lists/users/2013/12/23158.php >> >> >> On Dec 6, 2013, at 1:35 AM, ???? <781578...@qq.com> wrote: >> >> > Here is my code: >> > int*a=(int*)malloc(sizeof(int)*number); >> > MPI_Send(a,number, MPI_INT, 1, 1,MPI_COMM_WORLD); >> > >> > int*b=(int*)malloc(sizeof(int)*number); >> > MPI_Recv(b, number, MPI_INT, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &status); >> > >> > number here is the size of my array(eg,a or b). >> > I have try it on my local compute and my rocks cluster.On rocks cluster, >> > one processor on one frontend node use "MPI_Send" send a message ,other >> > processors on compute nodes use "MPI_Recv" receive message . >> > when number is least than 10000,other processors can receive message fast; >> > but when number is more than 15000,other processors can receive message >> > slowly >> > why?? becesue openmpi API ?? or other problems? >> > >> > it spends me a few days , I want your help,thanks for all readers. good >> > luck for you >> > >> > >> > >> > >> > ------------------ ???????? ------------------ >> > ??????: "Ralph Castain";<r...@open-mpi.org>; >> > ????????: 2013??12??5??(??????) ????6:52 >> > ??????: "Open MPI Users"<us...@open-mpi.org>; >> > ????: Re: [OMPI users] can you help me please ?thanks >> > >> > You are running 15000 ranks on two nodes?? My best guess is that you are >> > swapping like crazy as your memory footprint problem exceeds available >> > physical memory. >> > >> > >> > >> > On Thu, Dec 5, 2013 at 1:04 AM, ???? <781578...@qq.com> wrote: >> > My ROCKS cluster includes one frontend and two compute nodes.In my >> > program,I have use the openmpi API such as MPI_Send and MPI_Recv . but >> > when I run the progam with 3 processors . one processor send a message >> > ,other receive message .here are some code. >> > int*a=(int*)malloc(sizeof(int)*number); >> > MPI_Send(a,number, MPI_INT, 1, 1,MPI_COMM_WORLD); >> > >> > int*b=(int*)malloc(sizeof(int)*number); >> > MPI_Recv(b, number, MPI_INT, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &status); >> > >> > when number is least than 10000,it runs fast. >> > but number is more than 15000,it runs slowly >> > >> > why?? becesue openmpi API ?? or other problems? >> > ------------------ ???????? ------------------ >> > ??????: "Ralph Castain";<r...@open-mpi.org>; >> > ????????: 2013??12??3??(??????) ????1:39 >> > ??????: "Open MPI Users"<us...@open-mpi.org>; >> > ????: Re: [OMPI users] can you help me please ?thanks >> > >> > >> > >> > >> > >> > On Mon, Dec 2, 2013 at 9:23 PM, ???? <781578...@qq.com> wrote: >> > A simple program at my 4-node ROCKS cluster runs fine with command: >> > /opt/openmpi/bin/mpirun -np 4 -machinefile machines ./sort_mpi6 >> > >> > >> > Another bigger programs runs fine on the head node only with command: >> > >> > cd ./sphere; /opt/openmpi/bin/mpirun -np 4 ../bin/sort_mpi6 >> > >> > But with the command: >> > >> > cd /sphere; /opt/openmpi/bin/mpirun -np 4 -machinefile ../machines >> > ../bin/sort_mpi6 >> > >> > It gives output that: >> > >> > ../bin/sort_mpi6: error while loading shared libraries: libgdal.so.1: >> > cannot open >> > shared object file: No such file or directory >> > ../bin/sort_mpi6: error while loading shared libraries: libgdal.so.1: >> > cannot open >> > shared object file: No such file or directory >> > ../bin/sort_mpi6: error while loading shared libraries: libgdal.so.1: >> > cannot open >> > shared object file: No such file or directory >> > >> > >> > >> > _______________________________________________ >> > users mailing list >> > us...@open-mpi.org >> > http://www.open-mpi.org/mailman/listinfo.cgi/users >> > >> > >> > _______________________________________________ >> > users mailing list >> > us...@open-mpi.org >> > http://www.open-mpi.org/mailman/listinfo.cgi/users >> > >> > _______________________________________________ >> > users mailing list >> > us...@open-mpi.org >> > http://www.open-mpi.org/mailman/listinfo.cgi/users >> >> >> -- >> 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 >> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
