7dbf9d43f5
Performance optimization for the internals of the Regexp type. This adds no features and has no user-visible impact beyond performance. Copy now shares the cache, so memory usage for programs that use Copy a lot should go down; Copy has effectively become a no-op. The before v. after benchmark results show a lot of noise from run to run, but there's a clear improvement to the Shared case and no detriment to the Copied case. BenchmarkMatchParallelShared-4 361 77.9 -78.42% BenchmarkMatchParallelCopied-4 70.3 72.2 +2.70% Macro benchmarks show that the lock contention in Regexp is gone, and my server is now able to scale linearly 2.5x times more than before (and I only stopped there because I ran out of CPU in my test machine). Fixes #24411 Change-Id: Ib33abff2802f27599f5d09084775e95b54e3e1d7 Reviewed-on: https://go-review.googlesource.com/101715 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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