[Paraview] slow rendering speed

[Moreland, Kenneth]

Yup.  That is probably your problem.

-Ken


On 9/10/08 3:02 PM, "Biao She" <shebiao at gmail.com> wrote:

> 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
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>
>>>>
>>
>