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Dmitriy Vyukov authored
Introduce global stack segment cache and limit per-thread cache size. This greatly reduces StackSys memory on workloads that create lots of threads. benchmark old ns/op new ns/op delta BenchmarkStackGrowth 665 656 -1.35% BenchmarkStackGrowth-2 333 328 -1.50% BenchmarkStackGrowth-4 224 172 -23.21% BenchmarkStackGrowth-8 124 91 -26.13% BenchmarkStackGrowth-16 82 47 -41.94% BenchmarkStackGrowth-32 73 40 -44.79% BenchmarkStackGrowthDeep 97231 94391 -2.92% BenchmarkStackGrowthDeep-2 47230 58562 +23.99% BenchmarkStackGrowthDeep-4 24993 49356 +97.48% BenchmarkStackGrowthDeep-8 15105 30072 +99.09% BenchmarkStackGrowthDeep-16 10005 15623 +56.15% BenchmarkStackGrowthDeep-32 12517 13069 +4.41% TestStackMem#1,MB 310 12 -96.13% TestStackMem#2,MB 296 14 -95.27% TestStackMem#3,MB 479 14 -97.08% TestStackMem#1,sec 3.22 2.26 -29.81% TestStackMem#2,sec 2.43 2.15 -11.52% TestStackMem#3,sec 2.50 2.38 -4.80% R=sougou, no.smile.face, rsc CC=golang-dev, msolomon https://golang.org/cl/7029044
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