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, ???? <[email protected]> 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";<[email protected]>;
> ????????: 2013??12??5??(??????) ????6:52
> ??????: "Open MPI Users"<[email protected]>;
> ????: 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, ???? <[email protected]> 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";<[email protected]>;
> ????????: 2013??12??3??(??????) ????1:39
> ??????: "Open MPI Users"<[email protected]>;
> ????: Re: [OMPI users] can you help me please ?thanks
>
>
>
>
>
> On Mon, Dec 2, 2013 at 9:23 PM, ???? <[email protected]> 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
> [email protected]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
>
> _______________________________________________
> users mailing list
> [email protected]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
> _______________________________________________
> users mailing list
> [email protected]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
--
Jeff Squyres
[email protected]
For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/
