Slow flush calls

[Leon Scroggins]

Hi!

We're using Ganesh on Vulkan on Linux to draw lines and polygons. Sometimes flush is extremely slow. Any suggestions on how to start debugging?

It's been a while ;)

[Noelle Scobie]

Hi, Leon! :)

Assuming you're the one compiling the copy of Skia in question, https://skia-review.googlesource.com/c/skia/+/1131277 adds an easy way to aggressively trace every API call Skia makes to Vulkan, which may be a helpful start. Also, knowing what the relatively tiny slices at the start and end of that long GrDrawingManager::flush slice are would help guide where else you should add TRACE_EVENT0(...) calls to narrow things down.

Cheers!

-Noelle

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[Aitor Gomila]

Hey!

Out of curiosity, what profiler do you use? I'm looking for one!

[Leon Scroggins]

Thanks! I'm not seeing the same problem right now. I think it was reduced by removing some contention on the GPU.

When I worked on Skia, I typically used Perfetto when working with Skia on Android. But you can also override SkEventTracer to integrate with other systems.

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