[Impeller] use fewer threads for shader bootstrap workers on low core machines. #50726
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jonahwilliams
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gaaclarke
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Feb 16, 2024
| size_t ChooseThreadCountForWorkers(size_t hardware_concurrency) { | ||
| // Never create more than 4 worker threads. Attempt to use up to | ||
| // half of the available concurrency. | ||
| return std::min(4ull, std::max(hardware_concurrency / 2ull, 1ull)); |
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nit: This would be much easier to parse with a clamp function
return clamp(hardware_concurrency / 2ull, /*min=*/1ull, /*max=*/4ull);There was a problem hiding this comment.
Give 'em the clamps.
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oh cool, I didn't know they have one in std. I think the linter is going to complain that the arg names should be lo and hi... yea, lo and hi 🙄
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they charge per letter
gaaclarke
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Feb 16, 2024
| /// Choose the number of worker threads the context_vk will create. | ||
| /// | ||
| /// Visible for testing. | ||
| size_t ChooseThreadCountForWorkers(size_t hardware_concurrency); |
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Oh, this should be static too.
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…n low core machines. (flutter/engine#50726)
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…143607) flutter/engine@5fd5ccf...13dc857 2024-02-16 jonahwilliams@google.com [Impeller] use fewer threads for shader bootstrap workers on low core machines. (flutter/engine#50726) 2024-02-16 goderbauer@google.com Fix implementation imports outside of lib (flutter/engine#50727) 2024-02-16 skia-flutter-autoroll@skia.org Roll Skia from 87e8e9c8f42b to 2919d86cad12 (8 revisions) (flutter/engine#50723) 2024-02-16 skia-flutter-autoroll@skia.org Roll Dart SDK from 947c8c487e28 to 21b9ee6f0a52 (2 revisions) (flutter/engine#50717) 2024-02-16 skia-flutter-autoroll@skia.org Roll Skia from c89a4cd72308 to 87e8e9c8f42b (3 revisions) (flutter/engine#50716) 2024-02-16 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from fXqP_YC4zTp9G2hA5... to YN5KCfom7Ax0Z69s_... (flutter/engine#50719) Also rolling transitive DEPS: fuchsia/sdk/core/linux-amd64 from fXqP_YC4zTp9 to YN5KCfom7Ax0 If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC jsimmons@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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Part of flutter/flutter#143540
We were using 4 threads for shader bootstrap on a device with only 4 cores. Using fewer threads seems to improve performance on fewer core machines.