mirror of https://github.com/golang/go.git
dcd9e5bc0f
Currently we depend on the good graces and timing of the scheduler to get opportunities to start dedicated mark workers. In the worst case, it may take 10ms to get dedicated mark workers going at the beginning of mark 1 and mark 2 or after the amount of available work has dropped and gone back up. Instead of waiting for the regular preemption logic to get around to us, make putfull enlist a random P if we're not already running enough dedicated workers. This should improve performance stability of the garbage collector and is likely to improve the overall performance somewhat. No overall effect on the go1 benchmarks. It speeds up the garbage benchmark by 12%, which more than counters the performance loss from the previous commit. name old time/op new time/op delta XBenchGarbage-12 6.32ms ± 4% 5.58ms ± 2% -11.68% (p=0.000 n=20+16) name old time/op new time/op delta BinaryTree17-12 3.18s ± 5% 3.12s ± 4% -1.83% (p=0.021 n=20+20) Fannkuch11-12 2.50s ± 2% 2.46s ± 2% -1.57% (p=0.000 n=18+19) FmtFprintfEmpty-12 50.8ns ± 3% 50.4ns ± 3% ~ (p=0.184 n=20+20) FmtFprintfString-12 167ns ± 2% 171ns ± 1% +2.46% (p=0.000 n=20+19) FmtFprintfInt-12 161ns ± 2% 163ns ± 2% +1.81% (p=0.000 n=20+20) FmtFprintfIntInt-12 269ns ± 1% 266ns ± 1% -0.81% (p=0.002 n=19+20) FmtFprintfPrefixedInt-12 237ns ± 2% 231ns ± 2% -2.86% (p=0.000 n=20+20) FmtFprintfFloat-12 313ns ± 2% 313ns ± 1% ~ (p=0.681 n=20+20) FmtManyArgs-12 1.05µs ± 2% 1.03µs ± 1% -2.26% (p=0.000 n=20+20) GobDecode-12 8.66ms ± 1% 8.67ms ± 1% ~ (p=0.380 n=19+20) GobEncode-12 6.56ms ± 1% 6.56ms ± 2% ~ (p=0.607 n=19+20) Gzip-12 317ms ± 1% 314ms ± 2% -1.10% (p=0.000 n=20+19) Gunzip-12 42.1ms ± 1% 42.2ms ± 1% +0.27% (p=0.044 n=20+19) HTTPClientServer-12 62.7µs ± 1% 62.0µs ± 1% -1.04% (p=0.000 n=19+18) JSONEncode-12 16.7ms ± 1% 16.8ms ± 2% +0.59% (p=0.021 n=20+20) JSONDecode-12 58.2ms ± 1% 61.4ms ± 2% +5.43% (p=0.000 n=18+19) Mandelbrot200-12 3.84ms ± 1% 3.87ms ± 2% +0.79% (p=0.008 n=18+20) GoParse-12 3.86ms ± 2% 3.76ms ± 2% -2.60% (p=0.000 n=20+20) RegexpMatchEasy0_32-12 100ns ± 2% 100ns ± 1% -0.68% (p=0.005 n=18+15) RegexpMatchEasy0_1K-12 332ns ± 1% 342ns ± 1% +3.16% (p=0.000 n=19+19) RegexpMatchEasy1_32-12 82.9ns ± 3% 83.0ns ± 2% ~ (p=0.906 n=19+20) RegexpMatchEasy1_1K-12 487ns ± 1% 494ns ± 1% +1.50% (p=0.000 n=17+20) RegexpMatchMedium_32-12 131ns ± 2% 130ns ± 1% ~ (p=0.686 n=19+20) RegexpMatchMedium_1K-12 39.6µs ± 1% 39.2µs ± 1% -1.09% (p=0.000 n=18+19) RegexpMatchHard_32-12 2.04µs ± 1% 2.04µs ± 2% ~ (p=0.804 n=20+20) RegexpMatchHard_1K-12 61.7µs ± 2% 61.3µs ± 2% ~ (p=0.052 n=18+20) Revcomp-12 529ms ± 2% 533ms ± 1% +0.83% (p=0.003 n=20+19) Template-12 70.7ms ± 2% 71.0ms ± 2% ~ (p=0.065 n=20+19) TimeParse-12 351ns ± 2% 355ns ± 1% +1.25% (p=0.000 n=19+20) TimeFormat-12 362ns ± 2% 373ns ± 1% +2.83% (p=0.000 n=18+20) [Geo mean] 62.2µs 62.3µs +0.13% name old speed new speed delta GobDecode-12 88.6MB/s ± 1% 88.5MB/s ± 1% ~ (p=0.392 n=19+20) GobEncode-12 117MB/s ± 1% 117MB/s ± 1% ~ (p=0.622 n=19+20) Gzip-12 61.1MB/s ± 1% 61.8MB/s ± 2% +1.11% (p=0.000 n=20+19) Gunzip-12 461MB/s ± 1% 460MB/s ± 1% -0.27% (p=0.044 n=20+19) JSONEncode-12 116MB/s ± 1% 115MB/s ± 2% -0.58% (p=0.022 n=20+20) JSONDecode-12 33.3MB/s ± 1% 31.6MB/s ± 2% -5.15% (p=0.000 n=18+19) GoParse-12 15.0MB/s ± 2% 15.4MB/s ± 2% +2.66% (p=0.000 n=20+20) RegexpMatchEasy0_32-12 317MB/s ± 2% 319MB/s ± 2% ~ (p=0.052 n=20+20) RegexpMatchEasy0_1K-12 3.08GB/s ± 1% 2.99GB/s ± 1% -3.07% (p=0.000 n=19+19) RegexpMatchEasy1_32-12 386MB/s ± 3% 386MB/s ± 2% ~ (p=0.939 n=19+20) RegexpMatchEasy1_1K-12 2.10GB/s ± 1% 2.07GB/s ± 1% -1.46% (p=0.000 n=17+20) RegexpMatchMedium_32-12 7.62MB/s ± 2% 7.64MB/s ± 1% ~ (p=0.702 n=19+20) RegexpMatchMedium_1K-12 25.9MB/s ± 1% 26.1MB/s ± 2% +0.99% (p=0.000 n=18+20) RegexpMatchHard_32-12 15.7MB/s ± 1% 15.7MB/s ± 2% ~ (p=0.723 n=20+20) RegexpMatchHard_1K-12 16.6MB/s ± 2% 16.7MB/s ± 2% ~ (p=0.052 n=18+20) Revcomp-12 481MB/s ± 2% 477MB/s ± 1% -0.83% (p=0.003 n=20+19) Template-12 27.5MB/s ± 2% 27.3MB/s ± 2% ~ (p=0.062 n=20+19) [Geo mean] 99.4MB/s 99.1MB/s -0.35% Change-Id: I914d8cadded5a230509d118164a4c201601afc06 Reviewed-on: https://go-review.googlesource.com/16298 Reviewed-by: Rick Hudson <rlh@golang.org> |
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