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8fc6ed4c89
Currently Pool can cache up to 15 elements per P, and these elements are not accesible to other Ps. If a Pool caches large objects, say 2MB, and GOMAXPROCS is set to a large value, say 32, then the Pool can waste up to 960MB. The new caching policy caches at most 1 per-P element, the rest is shared between Ps. Get/Put performance is unchanged. Nested Get/Put performance is 57% worse. However, overall scalability of nested Get/Put is significantly improved, so the new policy starts winning under contention. benchmark old ns/op new ns/op delta BenchmarkPool 27.4 26.7 -2.55% BenchmarkPool-4 6.63 6.59 -0.60% BenchmarkPool-16 1.98 1.87 -5.56% BenchmarkPool-64 1.93 1.86 -3.63% BenchmarkPoolOverlflow 3970 6235 +57.05% BenchmarkPoolOverlflow-4 10935 1668 -84.75% BenchmarkPoolOverlflow-16 13419 520 -96.12% BenchmarkPoolOverlflow-64 10295 380 -96.31% LGTM=rsc R=rsc CC=golang-codereviews, khr https://golang.org/cl/86020043 |
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