[Paraview] slow rendering speed

[Biao She]

Hi Ken. Thanks for reply again.I have tried this command, but the error is
still the same: "DISPLAY is not accessible on the server side".
In the wiki, there are three things to do with X Connections:

   1. Have xdm run on each cluster node at startup. Although xdm is almost
   always run at startup on workstation installations, it is not as commonplace
   to be run on cluster nodes. Talk to your system administrators for help in
   setting this up.
   2. Disable all security on the X server. That is, allow any process to
   open a window on the x server without having to log in. Again, talk to your
   system administrators for help.
   3. Make sure each process is run with the DISPLAY environment variable
   set to localhost:0 (or just :0).

I have talked to system administrator about the first two things. The guy
said that both are ok on the cluster, but he isn't 100 percent sure about
the second thing. I try to run the glxgeasr program but it doesn't work. The
error I got is "couldn't open display '(null)' "
Could the problem result from the first two configurations? What do you
think?

Thanks,

Aaron

On Wed, Sep 10, 2008 at 1:37 PM, Moreland, Kenneth <kmorel at sandia.gov>wrote:

> It sounds like you are using the env program wrong.  The env program runs a
> command, specified on its command line, with a modified environment, but
> does not modify the environment of the calling program.  To use env, you
> need to use it within your mpirun command:
>
> mpirun -np 4 /usr/bin/env DISPLAY=localhost:0 ./pvserver
>
> -Ken
>
>
> On 9/10/08 11:32 AM, "Biao She" <shebiao at gmail.com> wrote:
>
> > Thanks your help again, Ken.
> > You figure out my problem. I indeed connect to localhost:10.0. I am a
> newbie
> > of Linux and ssh, I don't know how to connect to localhost:0.0 instead of
> > 10.0. After I ssh to the cluster, the DISPLAY automatically set to
> > localhost:10.0. I use "/usr/bin/env DISPLAY=localhost:0" command to set
> it
> > back. Then, when I try to connect to the paraview server, I get an error
> like
> > this "DISPLAY is not accessible on the server side".
> > I know that if I start pvserver from the cluster directly, the DISPLAY is
> > localhost:0, but the cluster doesn't have any keyboard and monitor.
> > How can I connect to localhost:0 remotely?
> > Thanks!
> >
> > Aaron
> >
> >
> > On Wed, Sep 10, 2008 at 7:09 AM, Moreland, Kenneth <kmorel at sandia.gov>
> wrote:
> >> First, let me just say that you should not expect the parallel rendering
> of
> >> such a small data set to be faster than just rendering it locally.  The
> >> parallel rendering has a constant overhead involving the readback of
> pixels,
> >> the transfer of data, and the computation of compositing operations.
> >>
> >> That said, based on the error it looks like your DISPLAY environment is
> set
> >> wrong.  You should be connecting to localhost:0.0, not localhost:10.0.
>  You
> >> are probably forwarding all of your rendering commands back to the
> desktop
> >> you logged in from though ssh forwarding.  That, of course, will really
> slow
> >> things down because all the rendering commands are being shoved through
> the
> >> network and all are being processed on a single machine.
> >>
> >> Make sure that you are actually rendering to the local GPU.  See the
> >> ParaView Wiki for more advice.
> >>
> >>   http://www.paraview.org/Wiki/Setting_up_a_ParaView_Server
> >>
> >> -Ken
> >>
> >>
> >> On 9/9/08 4:24 PM, "Biao She" <shebiao at gmail.com> wrote:
> >>
> >>>> Hi there.
> >>>> I use the client/server mode of paraview to render a small data(about
> 4M),
> >>>> >> but
> >>>> the speed is very slow.
> >>>> Below is how I do it:
> >>>> I first ssh to the cluster and start the pvserver by this command:
> mpirun
> >>>> >> -np
> >>>> 4 ./pvserver. The cluster is SGI Altix 4000. The operating system on
> the
> >>>> cluster is SUSe linux, 64 bits system.
> >>>> Then, I launch the paraview client on my local windows computer. After
> the
> >>>> client connected to the server, there are two types of errors:
> >>>> 1. Xlib: extension "XFree86-DRI" missing on display "localhost:10.0"
> >>>> 2. unaligned access to 0x600000000197a1bc, ip=0x2000000003568e0
> >>>> Paraview works regardless of these errors, but the problem is that the
> >>>> rendering speed is way too slow.
> >>>> I am wondering what could cause the slow down? Maybe the paraview
> doesn't
> >>>> >> use
> >>>> GPU on the clusters at all? How could I tell if the paraveiw use GPU
> or
> >>> not?
> >>>> Or the unaligned access slow down the speed? These errors keep on
> repeating
> >>>> whenever I change the viewplane.
> >>>> I have stalled by this problem for days, any idea would be highly
> >>> appreciated.
> >>>>
> >>>> Thanks!
> >>>>
> >>>> Aaron
> >>>>
> >>>>
> >>>>
> >>
> >
>
>
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