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<TITLE>Re: [Paraview] Paraview and Multicore</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>The question about why the pvserver processes are always at 100% CPU comes up frequently on the mailing list (such as <a href="http://www.paraview.org/pipermail/paraview/2008-December/010338.html">http://www.paraview.org/pipermail/paraview/2008-December/010338.html</a>). I’ve added some information to the Wiki about it to provide an explanation: <a href="http://www.paraview.org/Wiki/Setting_up_a_ParaView_Server#Server_processes_always_have_100.25_CPU_usage">http://www.paraview.org/Wiki/Setting_up_a_ParaView_Server#Server_processes_always_have_100.25_CPU_usage</a><BR>
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-Ken<BR>
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On 5/13/10 5:06 AM, "Guido Staub" <<a href="gstaub@udec.cl">gstaub@udec.cl</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Hi all,<BR>
<BR>
I have succesfully compiled Paraview with MPI support on my<BR>
Workstation (Quad Core). I have read that paraview runs serial,<BR>
pvserver parallel, so I started the server by mpirun -np 4 pvserver and<BR>
connected through X. Everything seems to work fine.<BR>
<BR>
But there are two strange behaviours I have noticed:<BR>
<BR>
1. CPU usage on workstation is almost 100% on three of the four cores<BR>
although no client is connected (when I type mpirun -np 3 pvserver there<BR>
are 2 out of 4 running at 100%; with -np 2 only 1). I have noticed this<BR>
using MPICH2 and OpenMPI.<BR>
<BR>
2. When I now start a client process the server uses only one core (-np<BR>
4/3/2/1). Why?<BR>
<BR>
Does MPI not work on multicore systems as on multiprocessor systems or<BR>
is this a Paraview issue?<BR>
<BR>
Thanks,<BR>
Guido<BR>
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**** Kenneth Moreland<BR>
*** Sandia National Laboratories<BR>
*********** <BR>
*** *** *** email: <a href="kmorel@sandia.gov">kmorel@sandia.gov</a><BR>
** *** ** phone: (505) 844-8919<BR>
*** web: <a href="http://www.cs.unm.edu/~kmorel">http://www.cs.unm.edu/~kmorel</a><BR>
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