[Paraview] parallel rendering problem

[Berk Geveci]

That is true; offscreen rendering _should_ work as long as the OpenGL
driver cooperates. However, you are not gaining much in terms of
rendering performance since all processes will be using the same GPU.
We are starting to think about scaling number of processes we use
without scaling the number of GPUs....

-berk


On Mon, May 5, 2008 at 1:53 PM, Kent Eschenberg <eschenbe at psc.edu> wrote:
> Is there perhaps one more option: use off-screen rendering? I haven't
> written OpenGL directly for a while but I think there is a way to use the
> hardware accelerator to write to a buffer. I'm not sure how to ask PV to use
> this mode.
>
>  I'm particularly interested in the answer because we have a similar system:
> dual quad-core Xeons plus a graphics card on each node, with 4 nodes.
>
>  Kent
>  Pittsburgh Supercomputing Center
>
>
>
>  Berk Geveci wrote:
>
> > The problem is that the server windows are overlapping. Most OpenGL
> > drivers, specially on Linux, does not fully render in regions that are
> > obscured by other windows. There are a few ways to fix this:
> > 0. Make sure the windows do not overlap
> > 1. Do not use parallel rendering - disable remote rendering in your
> settings
> > 2. Use software rendering by compiling against Mesa
> >
> > Which one is the best depends on what you are trying to do. It sounds
> > like you are running the server on the same machine as the client. In
> > that case, (1) may be the better option as long as you are not volume
> > rendering. If you are running on a cluster, (0) is the best option.
> > You can achieve that by setting the DISPLAY properly to make sure that
> > each window is rendering on a separate display. (2) is the fallback
> > option but is probably the slowest unless you have a lot of nodes.
> >
> > -berk
> >
> >
> > On Mon, May 5, 2008 at 1:00 PM, Server Levent Yilmaz
> > <leventyilmaz at gmail.com> wrote:
> >
> > > Hi,
> > >
> > > I have what is seemingly a parallel rendering problem, although I can
> not be
> > > sure.  I have tested this with ParaView 3.2.1 and the latest HEAD (as of
> > > this email's date). Please take a look at these screenshots: sequential
> (no
> > > problems here), 4 CPU run with 3.2.1, 4 CPU run with HEAD.
> > >
> > > The system is,
> > > cpu: dual quad core Intel Xeon
> > > gpu: dual Nvidia Quadro FX 570
> > > os: Ubuntu 8.04 (hardy)
> > > libs: gcc -4.2.3, mpich2-1.0.7 (with ch3:nemesis)
> > >
> > > I'd greatly appreciate any clues to track down the problem.
> > >
> > > thanks
> > > L:event
> > >
> > > --
> > > Server Levent Yilmaz
> > > Mechanical Engineering
> > > University of Pittsburgh
> > >
> >
>