[Paraview] Paraview and Multicore

[Moreland, Kenneth]

The question about why the pvserver processes are always at 100% CPU comes up frequently on the mailing list (such as http://www.paraview.org/pipermail/paraview/2008-December/010338.html).  I've added some information to the Wiki about it to provide an explanation: http://www.paraview.org/Wiki/Setting_up_a_ParaView_Server#Server_processes_always_have_100.25_CPU_usage

-Ken


On 5/13/10 5:06 AM, "Guido Staub" <gstaub at udec.cl> wrote:

Hi all,

I have succesfully compiled Paraview with MPI support on my
Workstation (Quad Core). I have read that paraview runs serial,
pvserver parallel, so I started the server by mpirun -np 4 pvserver and
connected through X. Everything seems to work fine.

But there are two strange behaviours I have noticed:

1. CPU usage on workstation is almost 100% on three of the four cores
although no client is connected (when I type mpirun -np 3 pvserver there
are 2 out of 4 running at 100%; with -np 2 only 1). I have noticed this
using MPICH2 and OpenMPI.

2. When I now start a client process the server uses only one core (-np
4/3/2/1). Why?

Does MPI not work on multicore systems as on multiprocessor systems or
is this a Paraview issue?

Thanks,
Guido
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   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: kmorel at sandia.gov
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel

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