fix: use single-threaded tokio runtime in sccache client #2460
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could you please add a test to make sure we don't regress in the future on this? thanks |
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## main #2460 +/- ##
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- Coverage 71.62% 59.37% -12.25%
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Files 65 64 -1
Lines 36459 31875 -4584
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- Hits 26112 18926 -7186
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The sccache client was using Runtime::new() which creates a multi-threaded tokio runtime with worker threads equal to the number of CPU cores. On high-core-count servers running many parallel builds, this created an excessive number of threads. For example: - 96 vCPU server - 10 concurrent make invocations - Each make using -j16 - Result: 96 × 10 × 16 = 15,360 threads created by sccache wrappers While these threads are short-lived, with continuous build pipelines this constant thread creation/destruction causes unnecessary overhead. The sccache client only performs simple I/O operations (connecting to server, sending requests, receiving responses) and doesn't need worker threads. This change replaces all client-side Runtime::new() calls with Builder::new_current_thread().enable_all().build() to use a single-threaded runtime, reducing thread count from num_cpus to 1 per client invocation.
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Will do. Doing a few more tests manually right now. Will add a test before taking this PR out of draft state. |
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The sccache client was using Runtime::new() which creates a multi-threaded tokio runtime with worker threads equal to the number of CPU cores. On high-core-count servers running many parallel builds, this created an excessive number of threads.
For example:
While these threads are short-lived, with continuous build pipelines this constant thread creation/destruction causes unnecessary overhead. The sccache client only performs simple I/O operations (connecting to server, sending requests, receiving responses) and doesn't need worker threads.
This change replaces all client-side Runtime::new() calls with Builder::new_current_thread().enable_all().build() to use a single-threaded runtime, reducing thread count from num_cpus to 1 per client invocation.