[Paraview] Paraview and Multicore

[Guido Staub]

Process Id Scalars didn't do the trick, still no performance gain with
Delaunay 2D.
My data is stored in a h5 file which gets loaded through a xdmf file.
After running the Process Id Scalars filter I do not see any changes in
the distribution of the data. However I guess that they are
already "evenly distributed" by default. 

So maybe exporting the file to an other format will do it or is there a
problem with the Delaunay implementation in general when running in
parallel?

Guido

 Am Thu, 13 May 2010 15:08:04
-0600 schrieb "Moreland, Kenneth" <kmorel at sandia.gov>:

> Ah, I see.  It sounds like your data is not balanced.  Many of the
> "non parallel" file formats will do something stupid when loading
> data in parallel.  For example, they might load everything on process
> 0 or load everything everywhere.  (And now that I think about it, the
> Delaunay filter may have trouble in parallel.)
> 
> Try running the "Process Id Scalars" filter on your data.  Do the
> points look evenly distributed?
> 
> -Ken
> 
> 
> On 5/13/10 10:17 AM, "Guido Staub" <gstaub at udec.cl> wrote:
> 
> Well if I start pvserver by mpirun -np 4 pvserver I have 3 cores
> running at almost 100%. Now I connect to the server and start a
> Delaunay 2D calculation on one of my datasets. As a result all of the
> 4 cores are showing 100%. However I assume that there is only one
> core doing the job, because on the one hand calculation is really
> slow. I have done similar processing on an other PC (an outdated one)
> and there is no significant performance advantage as one would expect.
> And on the other hand, running pvserver with e.g. -np 2 results in
> 100% for 2 CPUs when starting the Delaunay 2D calc (1 core at 100%
> when cpu is idle).
> 
> Guido
> 
> 
>  Am Thu, 13 May 2010
> 12:39:43 -0600 schrieb "Moreland, Kenneth" <kmorel at sandia.gov>:
> 
> > I am afraid I simply don't understand the question.  You said in (1)
> > that you have three cores running at 100%.  Then in (2) you said
> > that you only have one core running.  Is it happening when you
> > start the client, connect the client to the server, launch the
> > server from the client, or something else?  Is something running or
> > is the client sitting idle waiting for the user?
> >
> > -Ken
> >
> >
> > On 5/13/10 8:15 AM, "Guido Staub" <gstaub at udec.cl> wrote:
> >
> > 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
> > >
> >
> >
> >
> >
> >    ****      Kenneth Moreland
> >     ***      Sandia National Laboratories
> > ***********
> > *** *** ***  email: kmorel at sandia.gov
> > **  ***  **  phone: (505) 844-8919
> >     ***      web:   http://www.cs.unm.edu/~kmorel
> >
> 
> 
> 
> 
>    ****      Kenneth Moreland
>     ***      Sandia National Laboratories
> ***********
> *** *** ***  email: kmorel at sandia.gov
> **  ***  **  phone: (505) 844-8919
>     ***      web:   http://www.cs.unm.edu/~kmorel
>