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
