[Paraview] [EXTERNAL] Client-server mode fails with 5.0.1

[Paul Melis]

Hi Utkarsh,

On 06/27/2016 07:15 PM, Utkarsh Ayachit wrote:
> Paul,
>
> Can you try this:
> 1. Connect to pvserver started with  --use-offscreen-rendering
> 2. From Edit | Settings, Render View tab, set "Remote Render
> Threshold" to 0.  Accept the change using OK.
As soon as I set the threshold to 0 the warning about the OpenGL 3.2 
context pops up (but no segfault in this case).

I tried a very minimal example that creates a 3.2 context (using SDL) 
and that fails as well, so maybe something strange is going in with our 
nvidia driver installation. I'll see if I can do some more tests.

Paul
> 3. Interact with render view.
>
> Do you get the same segfault? If so, it's independent of what you're
> rendering, but just the fact that remote rendering kicks in. We can
> then debug further.
>
> Utkarsh
>
> On Mon, Jun 27, 2016 at 11:37 AM, Paul Melis <paul.melis at surfsara.nl> wrote:
>>
>> On 06/27/2016 05:29 PM, Paul Melis wrote:
>>> On 04/19/2016 01:04 PM, Paul Melis wrote:
>>>> Hi Utkarsh,
>>>>
>>>> On 18-04-16 20:04, Utkarsh Ayachit wrote:
>>>>>> This has always worked for me with earlier versions of
>>>>>> ParaView, but something seems to have changed. It could be the newer
>>>>>> NVidia
>>>>>> driver we use since a few weeks, but like I said, I don't see issues
>>>>>> with
>>>>>> any other OpenGL application.
>>>>>
>>>>> Paul, can you try with ParaView 5.0.0 and 4.4 binaries as well? Since
>>>>> those worked before, let's see if it's a NVIdia driver change that's
>>>>> affecting ParaView.
>>>>
>>>> 4.4 works without problem in client-server mode (although I can't seem to
>>>> get subsampled rendering during interaction working, no matter what remote
>>>> render settings I try). 5.0.0 shows the same GLX-related issue as 5.0.1.
>>>>
>>>> It smells like an interaction between the new OpenGL2 backend and the
>>>> NVidia driver we use (361.28): I tested 5.0.1 on my workstation (running
>>>> both client and server there) with driver 364.16 and there it works without
>>>> a problem. A test between my workstation (PV client) and a different machine
>>>> (PV server) with driver 352.79 also works.
>>> I just tried on a node with an updated nvidia driver (367.27, latest for
>>> the specific model of GPU used) and get the same error on the server side
>>> with 5.0.1.
>>>
>>> Trying 5.1.0 (binary from paraview.org for both client and server) and I
>>> no longer get the error and PV seems work fine in client-server mode.
>> This might or might not be related, but while retesting
>> http://www.paraview.org/Bug/view.php?id=13802 with 5.1.0 I get an error
>> relating to the OpenGL context on the server when switching to slice mode:
>>
>> paulm at s37n2:~/software/ParaView-5.1.0-Qt4-OpenGL2-MPI-Linux-64bit/bin$
>> ./pvserver --use-offscreen-rendering
>> Waiting for client...
>> Connection URL: cs://s37n2.int.elvis.surfsara.nl:11111
>> Accepting connection(s): s37n2.int.elvis.surfsara.nl:11111
>> Client connected.
>> Warning: In
>> /home/kitware/dashboards/buildbot/paraview-debian6dash-linux-shared-release_opengl2_qt4_superbuild/source-paraview/VTK/Rendering/OpenGL2/vtkOpenGLRenderWindow.cxx,
>> line 616
>> vtkXOpenGLRenderWindow (0x30b0eb0): VTK is designed to work with OpenGL
>> version 3.2 but it appears it has been given a context that does not support
>> 3.2. VTK will run in a compatibility mode designed to work with earlier
>> versions of OpenGL but some features may not work.
>>
>> Segmentation fault (core dumped)
>>
>> The supported OpenGL version is 4.2.0, so I don't understand why the context
>> is not 3.2 compatible:
>>
>> $ glxinfo
>> name of display: :0.0
>> display: :0  screen: 0
>> direct rendering: Yes
>> server glx vendor string: NVIDIA Corporation
>> server glx version string: 1.4
>> ...
>> client glx vendor string: NVIDIA Corporation, NVIDIA Corporation
>> client glx version string: 1.4
>> ...
>> OpenGL vendor string: NVIDIA Corporation
>> OpenGL renderer string: GeForce GTX 780 Ti/PCIe/SSE2
>> OpenGL version string: 4.5.0 NVIDIA 367.27
>> ....
>>
>> The nvidia driver used is 367.27, Debian 7.11 (wheezy), 64-bit
>>
>> Paul