[Paraview] pvserver always shows 100% cpu usage

[Burlen Loring]

Hi Guys,

I just checked this with 2 pvserver running on my 8 core workstation and 
I don't see it, I'm using mpich2-1.0.7.  I have heard somewhere it's an 
issue specific with openmpi, not sure how true that rumor is though.

Burlen


Jens wrote:
> Hi John,
>
> thanks for your answer. That makes sense. "Normal" mpi-apps are probably
> not written to wait for more things to do - they are simply always busy.
>
> It is just a pity that the cluster has to run 100% producing a lot of
> heat for nothing.
>
> So the MPI-lib will probably not change this behavior :( ? (I am using
> open-mpi 1.2.8)
>
> Greetings
> Jens
>
>
> John M. Patchett schrieb:
>   
>> Hi Jens,
>>   Your pvserver is probably waiting on an MPI_Recv and your MPI
>> implementation is spinning.
>> You will note that process 0 probably isn't doing this, as the other
>> nodes are waiting on process 0 to send.
>> I have searched this problem all the way to the MPI developers as it's
>> easy to replicate without paraview and the MPI guys assure me the
>> alternatives are worse.
>> -John.
>>
>> On Dec 5, 2008, at 8:42 AM, Jens wrote:
>>
>>     
>>> Hi,
>>>
>>> if I run "mpirun -np 4 ./pvserver" on our cluster-node and connect from
>>> my client, this pvserver always shows 100% cpu usage - even if I do
>>> nothing at the client.
>>>
>>> Seems to me as if there is a loop waiting for the client to ask for
>>> action - but this loop is calling no wait/sleep function.
>>>
>>> Greetings
>>> Jens
>>> _______________________________________________
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>>> ParaView at paraview.org
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>>>       
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-- 
Burlen Loring
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x137