[Paraview] Still Render in PV5.2.0 takes longer time than in PV4.4.0

[张驭洲]

Hi,

I'm using PV 5.2.0 and PV 4.4.0 in the standalone mode rendering a dataset, which contains 10M random points and is just for test. I found after I turned off  the display list as the PV User's Guide told me, the Still Render process in PV5.2.0 takes longer time than in PV4.4.0.

First, there is a NVIDIA GeForce GT 730 GPU in my computer, so I don't use mesa. When rendering with the display list on as default, PV 5.2.0 is faster than 4.4.0, which is reasonable. A truncated sample output of Timer Log of PV 5.2.0 is as follows:

RenderView::Update,  2.28551 seconds
    vtkPVView::Update,  2.28539 seconds
        Execute vtkFileSeriesReader id: 5063,  1.98558 seconds
        Execute vtkGeometryRepresentationWithFa,  0.298828 seconds
LegacyVTKFileReader::GatherInformation,  0.300355 seconds
Still Render,  0.43975 seconds
    OpenGL Dev Render,  0.334455 seconds

And the counterpart in PV 4.4.0 is:

RenderView::Update,  2.34043 seconds
    vtkPVView::Update,  2.34034 seconds
        Execute vtkFileSeriesReader id: 4734,  1.90546 seconds
        Execute vtkGeometryRepresentationWithFa,  0.43377 seconds
LegacyVTKFileReader::GatherInformation,  0.440593 seconds
Still Render,  0.963793 seconds
    OpenGL Dev Render,  0.806468 seconds

While other processes take similar time, the Still Render process in PV 5.2.0 takes less than half of that in PV 4.4.0.
The PV User's Guide recommends that when dealing with very large data, turning off display list may help. I tried it and found in this situation the Still Render process in PV 5.2.0 takes longer time than in PV 4.4.0.

A truncated sample output of Timer Log of PV 5.2.0 when turning off display list is as follows:

RenderView::Update,  2.23385 seconds
    vtkPVView::Update,  2.23374 seconds
        Execute vtkFileSeriesReader id: 4914,  1.93566 seconds
        Execute vtkGeometryRepresentationWithFa,  0.297103 seconds
LegacyVTKFileReader::GatherInformation,  0.301925 seconds
Still Render,  0.440343 seconds
    OpenGL Dev Render,  0.335149 seconds

And the counterpart in PV 4.4.0 is:

RenderView::Update,  2.4048 seconds
    vtkPVView::Update,  2.4047 seconds
        Execute vtkFileSeriesReader id: 4733,  1.97007 seconds
        Execute vtkGeometryRepresentationWithFa,  0.433521 seconds
LegacyVTKFileReader::GatherInformation,  0.440413 seconds
Still Render,  0.211394 seconds
    OpenGL Dev Render,  0.205734 seconds

While in PV 5.2.0 turning that option off had little effect on the running time, it significantly reduced the Still Render time in PV 4.4.0 and made the time less than half of that in PV 5.2.0.

Could anyone tell me why this happening? Thanks a lot!

-Zhang




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