[vtkusers] [vtk-developers] [vtk-users] OpenGL2 - GPU Volume Rendering performance
Aashish Chaudhary
aashish.chaudhary at kitware.com
Mon Nov 2 08:02:32 EST 2015
Hi Simon,
I found the reason behind the appeared performance you were getting. We
have this code in volume rendering that when you interact changes the
sampling distance and in the newer code we were too conservative compare to
the last version. That's why you were getting better quality when you move
your mouse but lower frame rates. I pushed a branch in VTK to address the
issue. Would it be possible for you to build Paraview with VTK master? It
may take 3-4 days or longer for Paraview's VTK to get updated.
Thanks,
Aashish
On Wed, Oct 28, 2015 at 11:59 AM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:
> Hi Simon,
>
> I am just finishing up a ParaView5 related parallel volume rendering bug
> (pushing a branch today to VTK). This is next on my list.
>
> - Aashish
>
> On Wed, Oct 28, 2015 at 11:57 AM, Simon ESNEAULT <simon.esneault at gmail.com
> > wrote:
>
>> Hello Aashish
>>
>> Did you get a chance to try to load the dataset on Windows ?
>> Can I do anything to help you investigate ? Should I feel a bug, that may
>> act as a reminder ?
>> Have a nice day
>> Simon
>>
>>
>> 2015-10-27 18:26 GMT+01:00 Aashish Chaudhary <
>> aashish.chaudhary at kitware.com>:
>>
>>> Thanks Simon. This is really strange since we are not seeing it on Mac
>>> and Linux (but both has dedicated cards).
>>>
>>> I will look into it soon.
>>>
>>> - aashish
>>>
>>> On Tue, Oct 27, 2015 at 1:03 PM, Simon ESNEAULT <
>>> simon.esneault at gmail.com> wrote:
>>>
>>>> Ok, thank you very much fort digging into this.
>>>> I've done some test and I believe I can see a similar slowdown
>>>> happening on OSX, with a MacBook pro retina 13" from 2013, Intel Iris 5100
>>>> graphics.
>>>> Good luck in the investigation, I you need more details, do not
>>>> hesitate to ask
>>>> Simon
>>>>
>>>> 2015-10-27 17:37 GMT+01:00 Aashish Chaudhary <
>>>> aashish.chaudhary at kitware.com>:
>>>>
>>>>> Ah, thanks. I will get back to you on this since on Linux I don't any
>>>>> issue so it has to be Windows specific thing.
>>>>>
>>>>> - Aashish
>>>>>
>>>>> On Tue, Oct 27, 2015 at 10:36 AM, Simon ESNEAULT <
>>>>> simon.esneault at gmail.com> wrote:
>>>>>
>>>>>> I tried with that one from yesterday and today's version
>>>>>> (4.4.0-209-gc399648)
>>>>>>
>>>>>> Thanks,
>>>>>> Simon
>>>>>>
>>>>>> 2015-10-27 15:19 GMT+01:00 Aashish Chaudhary <
>>>>>> aashish.chaudhary at kitware.com>:
>>>>>>
>>>>>>> Thanks.
>>>>>>>
>>>>>>> And when did you download this version? ParaView-latest-Qt4-OpenGL2-
>>>>>>> Windows-64bit.exe
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Aashish
>>>>>>>
>>>>>>> On Tue, Oct 27, 2015 at 10:17 AM, Simon ESNEAULT <
>>>>>>> simon.esneault at gmail.com> wrote:
>>>>>>>
>>>>>>>> Yes, I tried with and without the shading. Without shading enabled,
>>>>>>>> the new Opengl2 is also slower when zoomed in (in the described condition).
>>>>>>>> With shading enabled, the difference in speed between the two version seems
>>>>>>>> even bigger.
>>>>>>>> I got the version from the nightly build download section of
>>>>>>>> paraview website (it is still available). And I've just tried with that one
>>>>>>>> labeled "ParaView-latest-Qt4-OpenGL2-Windows-64bit.exe" with the same
>>>>>>>> results.
>>>>>>>>
>>>>>>>> About the FPS, it is difficult to give an exact number, because it
>>>>>>>> depends of the condition (zoomed or not etc...) but yes, this is the idea.
>>>>>>>> In our software, I've exposed the frame rate using this example :
>>>>>>>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/FrameRate
>>>>>>>> And the frame rate is around 15/20 for the first backend, and
>>>>>>>> around 6/8 for the new backend, on the same dataset (the one provided for
>>>>>>>> example), with the same mapper parameters
>>>>>>>>
>>>>>>>> Thanks
>>>>>>>> Simon
>>>>>>>>
>>>>>>>>
>>>>>>>> 2015-10-27 14:48 GMT+01:00 Aashish Chaudhary <
>>>>>>>> aashish.chaudhary at kitware.com>:
>>>>>>>>
>>>>>>>>> Hi Simon,
>>>>>>>>>
>>>>>>>>> This is helpful but just missing few more bits:
>>>>>>>>>
>>>>>>>>> 1) Did you try without the shading and see how the performance
>>>>>>>>> compares?
>>>>>>>>>
>>>>>>>>> 2) ParaView 4.4.0-193-gec96423 --> Where did you get this one
>>>>>>>>> from (ParaView download page or did you built yourself?)
>>>>>>>>>
>>>>>>>>> Also, so on your system the old mapper is running 30FPS and the
>>>>>>>>> new one at 15-20 FPS as per your summary.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> - Aashish
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Tue, Oct 27, 2015 at 9:43 AM, Simon ESNEAULT <
>>>>>>>>> simon.esneault at gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Hello Aashish,
>>>>>>>>>>
>>>>>>>>>> Sorry for the late answer, I was busy this morning.
>>>>>>>>>> Thanks for testing with the DataSet.
>>>>>>>>>> I agree the performance is still quite good with the new backend,
>>>>>>>>>> and I also get something like 15/20 fps on windows on an HD screen. But
>>>>>>>>>> when compared to the old one, and in some condition (when zoomed
>>>>>>>>>> especially), it looks really slower to me
>>>>>>>>>> The two tested version are :
>>>>>>>>>> - ParaView 4.4.0 64 bits final version for the old backend
>>>>>>>>>> - ParaView 4.4.0-193-gec96423 64 bits, for the OpenGL2 backend.
>>>>>>>>>> on a windows 7 box, Xeon E3-1220 v3 CPU, 16GB ram and Nvidia
>>>>>>>>>> Quadro K420
>>>>>>>>>>
>>>>>>>>>> To highlight the difference, here is what I do :
>>>>>>>>>> - Launch both version on the same computer at the same time
>>>>>>>>>> - Load the above dataset on each
>>>>>>>>>> - Select volume rendering
>>>>>>>>>> - Adjust the transfer function data range to [100-750] (the
>>>>>>>>>> default "Cool to Warm" is fine)
>>>>>>>>>> - Set the view direction to +Y
>>>>>>>>>> - Adjust the Y of the camera position to -300
>>>>>>>>>>
>>>>>>>>>> And start interacting ...
>>>>>>>>>> Dunno if there is an easy way to print out the Frame Rate in
>>>>>>>>>> Paraview, but the new version seems really twice slower in these
>>>>>>>>>> conditions... We can see it does not scale in the same way, the old backend
>>>>>>>>>> seems more aggressive on the image sample reduction, hence the
>>>>>>>>>> interactivity is better.
>>>>>>>>>> Shading enable or not does not change much
>>>>>>>>>>
>>>>>>>>>> I'm aware of the DesiredUpdateRate thing, we use to play with
>>>>>>>>>> this with the old backend to fine tune the interactivity, although what's
>>>>>>>>>> really inside was never clear to me
>>>>>>>>>>
>>>>>>>>>> I hope that there is enough information for you to reproduce
>>>>>>>>>> this, do not hesitate to ask for some more information.
>>>>>>>>>>
>>>>>>>>>> Thanks a lot for your help
>>>>>>>>>> Simon
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> 2015-10-27 14:10 GMT+01:00 Aashish Chaudhary <
>>>>>>>>>> aashish.chaudhary at kitware.com>:
>>>>>>>>>>
>>>>>>>>>>> Dear Simon,
>>>>>>>>>>>
>>>>>>>>>>> Checking again. Wondering if you can provide some more detail on
>>>>>>>>>>> the binary you are using and whether or not without shading the rendering
>>>>>>>>>>> performance comparable to older version.
>>>>>>>>>>>
>>>>>>>>>>> Thanks,
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Mon, Oct 26, 2015 at 3:12 PM, Aashish Chaudhary <
>>>>>>>>>>> aashish.chaudhary at kitware.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Simon,
>>>>>>>>>>>>
>>>>>>>>>>>> I used your dataset on paraview master as of today on my Linux
>>>>>>>>>>>> box running Ubuntu 14.04 and NVIDA Quadro card and I am getting about 15-20
>>>>>>>>>>>> FPS with shading on with 1920x1080 resolution.
>>>>>>>>>>>>
>>>>>>>>>>>> Are you on the proper 4.4 or using RC1/RC2? I checked the
>>>>>>>>>>>> shading performance fix was in 4.4 but not in RC's. I don't have access to
>>>>>>>>>>>> Windows box right away but I will try there too.
>>>>>>>>>>>>
>>>>>>>>>>>> NOTE: You might get multiple emails because of the attachment
>>>>>>>>>>>> size issue. Sorry about that.
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>
>>>>>>>>>>>> On Mon, Oct 26, 2015 at 2:45 PM, Aashish Chaudhary <
>>>>>>>>>>>> aashish.chaudhary at kitware.com> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Mon, Oct 26, 2015 at 2:13 PM, Simon ESNEAULT <
>>>>>>>>>>>>> simon.esneault at gmail.com> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>> Hello Aashish,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thanks for the quick answer
>>>>>>>>>>>>>> We are using a vtkImageData, 512x512x591 with short element
>>>>>>>>>>>>>> (you can find the dataset here :
>>>>>>>>>>>>>> https://www.dropbox.com/s/ptqwi0ebv75kt35/volume.zip). So I
>>>>>>>>>>>>>> think it's all about GPU volume raycast mapper.
>>>>>>>>>>>>>> The new mapper does bring low resolution, but when compared
>>>>>>>>>>>>>> to the old one, it seems less "low resolution" during interaction than the
>>>>>>>>>>>>>> old one
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Right, so that's why its not a exact comparison. What happens
>>>>>>>>>>>>> is that depending on what is interactive, (you can set the desired update
>>>>>>>>>>>>> rate in VTK, not exposed in ParaView I believe), it will do interactive
>>>>>>>>>>>>> but with higher resolution (smaller sample distance). If they both have
>>>>>>>>>>>>> the same sample distance, then the new mapper should out perform the old
>>>>>>>>>>>>> one, however, there is another thing we need to consider here which is
>>>>>>>>>>>>> shading.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>> Shading is enabled, gradient opacity disabled
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Can you disable the shading and see if now they both (opengl1
>>>>>>>>>>>>> and 2) equally better? We already pushed a fix for it but not sure if that
>>>>>>>>>>>>> you have in your build.
>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Don't know if you need a minimal example, but I believe the
>>>>>>>>>>>>>> GPURenderDemo used with this dataset is enough to highlight the slow down.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Yes, I will use this dataset. Thanks.
>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thanks
>>>>>>>>>>>>>> Simon
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> 2015-10-26 18:57 GMT+01:00 Aashish Chaudhary <
>>>>>>>>>>>>>> aashish.chaudhary at kitware.com>:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Also,
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Do you have shading enabled? We fixed a bug with shading
>>>>>>>>>>>>>>> that was causing the slow performance a while back. I don't remember if
>>>>>>>>>>>>>>> that was included in 4.4 or not ( I can check ).
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> - Aashish
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On Mon, Oct 26, 2015 at 1:53 PM, Aashish Chaudhary <
>>>>>>>>>>>>>>> aashish.chaudhary at kitware.com> wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Simon,
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> What kind of dataset you are using? Depending on the data
>>>>>>>>>>>>>>>> type you might be using
>>>>>>>>>>>>>>>> the GPU one or the unstructured renderer. The performance
>>>>>>>>>>>>>>>> we measured is related to the GPU ray cast mapper
>>>>>>>>>>>>>>>> and will apply only to the vtkImageData inputs.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Also, helpful would be is if you can tell if the new mapper
>>>>>>>>>>>>>>>> is bringing low resolution when you interact with the volume (and whether
>>>>>>>>>>>>>>>> or not it happens with old mapper).
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On Mon, Oct 26, 2015 at 1:47 PM, Simon ESNEAULT <
>>>>>>>>>>>>>>>> simon.esneault at gmail.com> wrote:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Hi All,
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> We are trying to make the switch to the new OpenGL2
>>>>>>>>>>>>>>>>> backend for our application, and although the switch was easy (thanks for
>>>>>>>>>>>>>>>>> not breaking the API ;) ), we can see a significant slowdown on the GPU
>>>>>>>>>>>>>>>>> volume rendering part, especially during interaction. Typically we dropped
>>>>>>>>>>>>>>>>> from 15/20 fps to 7/8 fps, on the same machine (Win32, Nvidia Quadro K420),
>>>>>>>>>>>>>>>>> with the same code around.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> This slow down can be seen in ParaView, if you compare the
>>>>>>>>>>>>>>>>> latest 4.4 OpenGL2 build with the classic 4.4 build while volume rendering
>>>>>>>>>>>>>>>>> a big enough volume (512^3)
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> The blog post here
>>>>>>>>>>>>>>>>> http://www.kitware.com/blog/home/post/976
>>>>>>>>>>>>>>>>> claims that the new GPU volume rendering implementation
>>>>>>>>>>>>>>>>> should be faster than the old one, is there some more detailed explanation
>>>>>>>>>>>>>>>>> somewhere ? Are there some important parameters that can make the
>>>>>>>>>>>>>>>>> difference ?
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Simon
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> PS : The polygonal rendering seems a lot faster with the
>>>>>>>>>>>>>>>>> new backend !
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> ------------------------------------------------------------------
>>>>>>>>>>>>>>>>> Simon Esneault
>>>>>>>>>>>>>>>>> Rennes, France
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> ------------------------------------------------------------------
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>>>>> Powered by www.kitware.com
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Visit other Kitware open-source projects at
>>>>>>>>>>>>>>>>> http://www.kitware.com/opensource/opensource.html
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Search the list archives at:
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>>>>>>>>>>>>>>>>> Follow this link to subscribe/unsubscribe:
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>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> *| Aashish Chaudhary | Technical Leader | Kitware
>>>>>>>>>>>>>>>> Inc. *
>>>>>>>>>>>>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>>>>>>>>>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> *| Aashish Chaudhary | Technical Leader | Kitware
>>>>>>>>>>>>>>> Inc. *
>>>>>>>>>>>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>>>>>>>>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> ------------------------------------------------------------------
>>>>>>>>>>>>>> Simon Esneault
>>>>>>>>>>>>>> Rennes, France
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> ------------------------------------------------------------------
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> --
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> *| Aashish Chaudhary | Technical Leader | Kitware
>>>>>>>>>>>>> Inc. *
>>>>>>>>>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>>>>>>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> *| Aashish Chaudhary | Technical Leader | Kitware Inc.
>>>>>>>>>>>> *
>>>>>>>>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>>>>>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> --
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> *| Aashish Chaudhary | Technical Leader | Kitware Inc.
>>>>>>>>>>> *
>>>>>>>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>>>>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> ------------------------------------------------------------------
>>>>>>>>>> Simon Esneault
>>>>>>>>>> Rennes, France
>>>>>>>>>> ------------------------------------------------------------------
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> *| Aashish Chaudhary | Technical Leader | Kitware Inc.
>>>>>>>>> *
>>>>>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> ------------------------------------------------------------------
>>>>>>>> Simon Esneault
>>>>>>>> Rennes, France
>>>>>>>> ------------------------------------------------------------------
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> *| Aashish Chaudhary | Technical Leader | Kitware Inc.
>>>>>>> *
>>>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> ------------------------------------------------------------------
>>>>>> Simon Esneault
>>>>>> Rennes, France
>>>>>> ------------------------------------------------------------------
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>>
>>>>>
>>>>>
>>>>> *| Aashish Chaudhary | Technical Leader | Kitware Inc.
>>>>> *
>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> ------------------------------------------------------------------
>>>> Simon Esneault
>>>> Rennes, France
>>>> ------------------------------------------------------------------
>>>>
>>>
>>>
>>>
>>> --
>>>
>>>
>>>
>>> *| Aashish Chaudhary | Technical Leader | Kitware Inc.
>>> *
>>> *| http://www.kitware.com/company/team/chaudhary.html
>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>
>>
>>
>>
>> --
>> ------------------------------------------------------------------
>> Simon Esneault
>> Rennes, France
>> ------------------------------------------------------------------
>>
>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader | Kitware Inc. *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
--
*| Aashish Chaudhary | Technical Leader | Kitware Inc. *
*| http://www.kitware.com/company/team/chaudhary.html
<http://www.kitware.com/company/team/chaudhary.html>*
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