A question about parallel computation

[Yin Feng]

Firstly, thanks for all your replies!

I changed compiler to MPICH and tried a sample successfully but the
problem is still there.
I ran my code in 4 nodes and each node have 8 processors. And the
information I saw is like:
 NODE        LOAD
       0             32
       1              0
        2             0
       3              0

Normally, in that case, we should see is:
NODE        LOAD
       0             8
       1              8
        2             8
       3              8

So, anyone got any idea about this?

Thank you in advance!

Sincerely,
YIN

On Wed, Jul 8, 2009 at 4:15 PM, Xin Qian<chianshin at gmail.com> wrote:
> You can try to run sole MPI samples coming with OpenMPI first, make sure the
> OpenMPI is running all right.
>
> Thanks,
>
> Xin Qian
>
> On Wed, Jul 8, 2009 at 4:48 PM, Yin Feng <yfeng1 at tigers.lsu.edu> wrote:
>>
>> I tried OpenMPI build PETSc and used mpirun provided by OpenMPI.
>> But, when I check the load on each node, I found the master node take
>> all the load
>> and others are just free.
>>
>> Did you have any idea about this situation?
>>
>> Thanks in adcance!
>>
>> Sincerely,
>> YIN
>>
>> On Wed, Jul 8, 2009 at 1:26 PM, Satish Balay<balay at mcs.anl.gov> wrote:
>> > Perhaps you are using the wrong mpiexec or mpirun. You'll have to use
>> > the correspond mpiexec from MPI you've used to build PETSc.
>> >
>> > Or if the MPI has special instruction on usage - you should follow
>> > that [for ex: some clusters require extra options to mpiexec ]
>> >
>> > Satish
>> >
>> > On Wed, 8 Jul 2009, Yin Feng wrote:
>> >
>> >> I am a beginner of PETSc.
>> >> I tried the PETSC example 5(ex5) with 4 nodes,
>> >> However, it seems every nodes doing the exactly the same things and
>> >> output the same results again and again. is this the problem of petsc
>> >> or
>> >> MPI installation?
>> >>
>> >> Thank you in adcance!
>> >>
>> >> Sincerely,
>> >> YIN
>> >>
>> >
>> >
>
>
>
> --
> QIAN, Xin (http://pubpages.unh.edu/~xqian/)
> xqian at unh.edu chianshin at gmail.com
>