[Paraview] Paraview and Multicore

[Guido Staub]

Thanks Ken, but I have already read this thread, therefore I started the
client process anyway without taking care of cpu usage for now.

However my second question still keeps me busy. Isn't it possible to
use all 4 cores?

Guido

Am Thu, 13 May 2010
10:29:13 -0600 schrieb "Moreland, Kenneth" <kmorel at sandia.gov>:

> 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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