[vtkusers] GPURenderDemo- Difference between linux OS and Windows OS

Aashish Chaudhary aashish.chaudhary at kitware.com
Tue Sep 23 14:24:21 EDT 2014

On Tue, Sep 23, 2014 at 3:15 AM, Emptystack <wulihouxiaoshuai at 163.com>

> I have used the gnome-system-monitor and top commands to test the memory of
> my applications. The result is almost same. So I used gdb to test the
> memory
> increasing point, which happened at the following lines of the
> vtkOpenGLGPUVolumeRayCastMapper.cxx:
>                   if(1) // !this->SupportsPixelBufferObjects)
>                     {
>                     vtkgl::TexImage3D(vtkgl::TEXTURE_3D, 0, internalFormat,
> textureSize[0],textureSize[1],textureSize[2],
>                                       0,format,type,dataPtr);
>                     }
> That would make sense since at this point you will expect the data to be
transferred to the GPU.

> the increasing memory is almost the size of the input image data. But on
> windows system,the occupied memory didn't increase on this point. Maybe
> just
> as you said, the RES memory of the top command  may also include the video
> memory used by the application,but I cannot find the evidence  to prove
> this
> comment. I will spend the following several days to solve this interesting
> problem.

You can look at the more detailed log in */proc. *there might be better
tools out there that can give you detain information on memory consumption
used by the app. Let us know if you find something. I will look as well.

You can also write a code which would consume just enough memory to skip
disk swap but which will need part of the memory reported by the htop or


> Many thanks!
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*| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
*| http://www.kitware.com/company/team/chaudhary.html
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