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Subject: Re: [OMPI users] can you help me please ?thanks
From: Ralph Castain (rhc_at_[hidden])
Date: 2013-12-05 05:52:25


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, ºúÑî <781578278_at_[hidden]> 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?
> ------------------ ԭʼÓʼþ ------------------
> *·¢¼þÈË:* "Ralph Castain";<rhc_at_[hidden]>;
> *·¢ËÍʱ¼ä:* 2013Äê12ÔÂ3ÈÕ(ÐÇÆÚ¶þ) ÖÐÎç1:39
> *ÊÕ¼þÈË:* "Open MPI Users"<users_at_[hidden]>;
> *Ö÷Ìâ:* Re: [OMPI users] can you help me please ?thanks
>
>
>
>
>
> On Mon, Dec 2, 2013 at 9:23 PM, ºúÑî <781578278_at_[hidden]> 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
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>
>
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