Use ProcessPoolExecutor instead of ThreadPoolExecutor. - #250
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ManishPatelKodiak wants to merge 1 commit into
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Use ProcessPoolExecutor instead of ThreadPoolExecutor.#250ManishPatelKodiak wants to merge 1 commit into
ManishPatelKodiak wants to merge 1 commit into
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With the ThreadPoolExecutor, it was observed that the compile commands generator was effectively running single threaded, most likely due to the GIL. CPU utilization was only about one core. Using a ProcessPoolExecutor to work around the GIL seems to provide a substantial performance benefit - it was 6x faster when running on a powerful machine on a very large repo.
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Per-action work has enough CPU-bound Python (arg patching, makefile-deps parsing, regex / path manipulation) that the GIL bottlenecks the ThreadPoolExecutor to roughly one core. Switching to a ProcessPoolExecutor was measured at ~6x speedup upstream. Backport of hedronvision#250 (ManishPatelKodiak).
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Hi — since upstream has been quiet for a while, the fork at https://github.com/helly25/bazel-compile-commands-extractor has picked up this change as part of a viability sweep. Backported (with attribution preserved in the commit message) in helly25#11. Thanks for the original patch. |
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With the ThreadPoolExecutor, it was observed that the compile commands extractor was effectively running single threaded for substantial periods of time, most likely due to the GIL. CPU utilization was only about one core. Using a ProcessPoolExecutor to work around the GIL seems to provide a substantial performance benefit - it was about 6x faster in a test run.