Fwd: [Paraview] MPI makes Paraview slower?

[Berk Geveci]

---------- Forwarded message ----------
From: Berk Geveci <berk.geveci at gmail.com>
Date: May 9, 2006 10:08 AM
Subject: Re: [Paraview] MPI makes Paraview slower?
To: "W. Bryan Smith" <bryan at ncmir.ucsd.edu>

Let's try to debug this:

1. You said if you open the same file and isosurface on 1 processor, it is
faster, right?
2. Please verify that you are rendering locally by checking off the
Composite flag in 3D View Properties.
3. When you load the image and you only see the wireframe outline, does it
render slow?
4. Open the timer log from Window -> Timer Log, push Clear on the upper
left, cause a render (rotate a bit), hit Refresh. What do you see on the
timer log?

-Berk



On 5/5/06, W. Bryan Smith <bryan at ncmir.ucsd.edu> wrote:
>
>
>
> On 5/5/06, Berk Geveci < berk.geveci at gmail.com> wrote:
> >
> > What kind of file are you loading? What and how are you rendering?
> >
>
> the file is an image file that was saved as legacy VTK from some other
> software (because i cannot figure out how to make paraview open a tiff). i
> am rendering an isosurface by clicking the little isosurface icon in the
> paraview window.  when i change some property (for example, change the color
> lookup table or something), paraview redraws the image using PainterPolyDataMapper,
> and it is slow and uses only one processor.
>
> Certain things will get slower when running with MPI because running in
> > parallel adds the overhead of interprocess communication. Creating and
> > rendering (in parallel) a small cone for example will be slower. ParaView
> > tries to optimize parameters for parallel execution but sometimes the user
> > has to set certain parameters appropriately.
> >
>
> i look forward to learning what those parameters are...
>
> bryan
>
>
> On 5/5/06, W. Bryan Smith < bryan at ncmir.ucsd.edu> wrote:
> > >
> > >
> > > [apologies if this was posted twice]
> > >
> > > hi,
> > >
> > > i am (a major newbie) running paraview in
> > > parallel mode with mpich2 (1.0.3) on a 2
> > > dual-core cpu machine using this:
> > >
> > > mpiexec -n 4 /usr/local/paraview2.5/bin/paraview/
> > >
> > > and many things seem slower than just running
> > > paraview in single cpu mode.  one of the trivial
> > > things that is noticably MUCH slower is simply
> > > loading a file: i have a 500MB file that takes
> > > about 5 seconds to load in single cpu mode, and
> > > takes about 30-40 seconds when running in MPI.
> > > also, no matter if i run in single or MPI, the
> > > slowest process that i have seen so far
> > > (PainterPolyDataMapper) only uses a single cpu.
> > > i am sure there is just something i am doing
> > > wrong.  any hints on how (if!?) i can change
> > > this behaviour?  i have ordered the book but it
> > > has not yet arrived...
> > >
> > > thanks,
> > > bryan
> > >
> > > W. Bryan Smith
> > > UCSD/NCMIR
> > > 9500 Gilman Drive # 0608
> > > La Jolla, CA, 92093-0608
> > >
> > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > > The illusion that we are separate from one another
> > > is an optical delusion of our consciousness.
> > >                                 -Albert Einstein
> > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > > _______________________________________________
> > > ParaView mailing list
> > > ParaView at paraview.org
> > > http://www.paraview.org/mailman/listinfo/paraview
> > >
> >
> >
>
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