Document how to use the perf(1) harness

Shopify / yjit-bench

Set of benchmarks for the YJIT CRuby JIT compiler and other Ruby implementations.

MIT License

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Closed XrXr closed 3 months ago

XrXr commented 3 months ago

The other day we lost ~20 minutes due to this race condition, so I thought I'd document it and also include a general guide.

maximecb commented 3 months ago

The race is bad, but yes, I recommend running a not-too-small number of iterations to minimize the noise when profiling anyway.

The perf harness could warn or force a higher minimum number of iterations to avoid the race condition?