[Paraview] pvserver always shows 100% cpu usage

[Jens]

Hi John,

thought about this problem again...

A solution could be
a)to use MPI_IRecv/MPI_Wait instead of MPI_Recv.

If that results in the same 100% cpu for the MPI_Wait-command,
b) it could be a solution to add a wait()/sleep() just beweeen MPI_IRecv
and MPI_Wait.
How long this wait/sleep would be could depend
a) on the time the function MPI_Wait takes to return.
b) or on some value send by process 0 (process 0 could send other
processes to sleep for a while)

What do you think?

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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