[Paraview] clipped scene with GPU rendering on NVIDIA tesla C1060

[pratik]

Burlen,
Thanks a lot for that tip! Yes, that indeed was the problem.

I was just wondering....why does the GPU rendering have to depend on the 
monitor at all? Since the GPU cards are doing the processing (at least 
as far as i know)...is there any way in which one can remove this 
monitor dependency altogether?
Also, if it is not possible to do gpu rendering without a monitor, then 
is it impossible to use the gpu's present in a cpu+gpu cluster(with 
headless nodes)?

I also tried xvfb, but it seems that it does not use the graphics cards 
at all, and i got terrible graphics.

Thanks again,
Pratik
On Wednesday 29 June 2011 09:13 PM, Burlen Loring wrote:
> Hi Pratik,
>
> I have had some similar issues when my desktop screen resolution was 
> higher than the server display resolution. Do you know what the 
> display resolution is set to on the server side? I was able to check 
> the server side resolution using xrandr command. The issue was fixed 
> by increasing the server display resolution in the xorg.conf. This 
> could be one possibility for what you are seeing.
>
> Burlen
>
> On 06/29/2011 07:42 AM, pratik wrote:
>> Hi everyone,
>> This is my configuration(PV v.3.10.1):
>> Server: desktop with 4 NVIDIA tesla C1060 cards; Client is a laptop.
>> To make use of GPU rendering, i start an Xserver on a free display 
>> like so(i cannot use the :0 display, also i cannot use $DISPLAY. if i 
>> use the $DISPLAY option, the server disconnects as soon as i load 
>> data from paraview):
>>
>> startx -- :14
>>
>> and my .xinitrc contains
>>
>> exec xdm
>>
>> so that xdm executes on the Xserver that is started.
>> once this is done, i simply run
>>
>> mpirun -np 4 pvserver -display localhost:14.0
>> OR
>> pvserver -display localhost:14.0
>>
>>
>> Everything goes fine, client connects to server etc. But when the 
>> actual visualization is done, a strip at the top (roughly 1/3 of 
>> screen) is blanked(see the attached image). A curious thing that i 
>> observed was that when i change the orientation, rotate the object 
>> etc, the LOD actor seems to render properly(meaning that i can see 
>> the whole picture), but after i let it settle then this clipping 
>> takes place. Only a few weeks back the rendering seemed to have 
>> happened perfectly, so i don't know why it is suddenly behaving this 
>> way now.
>>
>> Thanks  in advance for the help.
>>
>> -pratik
>>
>>
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