Slow transform manipulation performance for heavy mesh

[huidong-chen]

Description of Issue

Transform manipulation performance for heavy mesh is extremely slow.

We see this issue in Maya with both VP2RenderDelegate and HdStorm-based ALDrawOverride, 99% of the main-thread time is spent in USD reading from crate file and decompressing large primvar data buffer.

Initial discussion on this issue can be found at usd-interest forum:

https://groups.google.com/g/usd-interest/c/697eATsMcJM

Steps to Reproduce

1. Load asset in Maya with maya-usd plugin loaded. Or load in USDView if you have a way to manipulate transform.
2. Manipulate the transformation
3. Frame rate is ~0.5fps.
4. If I short-circuit the UsdImagingMeshAdapter::TrackVariability() function body, manipulation frame rate will be 27fps.

System Information (OS, Hardware)

Package Versions

Build Flags

[huidong-chen]

Please contact me if you need the heavy mesh which we used to reproduce Autodesk/maya-usd#566

[jtran56]

Filed as internal issue #USD-6304

[Xaia]

Hi, I was asked by @HdC-adsk to reupload the heavy mesh asset. You can download it here: https://we.tl/t-d3BmmUbC4r (link expires in 1 week (8th of September).

[gitamohr]

Thanks HdC-adsk for the excellent report, and thanks Xaia for sharing the asset! I have checked in a fix for the performance bug in the USD core internally. Without the fix, translating this asset takes ~1600 msec to redraw in usdview on my machine. With the fix, it takes ~130 msec.