Dmitriy Vyukov
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90f3cb13fb
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runtime: improve performance of sync channels
1. SudoG always contains a pointer to the element
(thus no variable size, and less copying).
2. chansend/chanrecv allocate SudoG on the stack.
3. Copying of elements and gorotuine notifications
are moved out of critical sections.
benchmark old ns/op new ns/op delta
BenchmarkSelectUncontended 515.00 514.00 -0.19%
BenchmarkSelectUncontended-2 291.00 281.00 -3.44%
BenchmarkSelectUncontended-4 213.00 189.00 -11.27%
BenchmarkSelectUncontended-8 78.30 79.00 +0.89%
BenchmarkSelectContended 518.00 514.00 -0.77%
BenchmarkSelectContended-2 655.00 631.00 -3.66%
BenchmarkSelectContended-4 1026.00 1051.00 +2.44%
BenchmarkSelectContended-8 2026.00 2128.00 +5.03%
BenchmarkSelectNonblock 175.00 173.00 -1.14%
BenchmarkSelectNonblock-2 85.10 87.70 +3.06%
BenchmarkSelectNonblock-4 60.10 43.30 -27.95%
BenchmarkSelectNonblock-8 37.60 25.50 -32.18%
BenchmarkChanUncontended 109.00 114.00 +4.59%
BenchmarkChanUncontended-2 54.60 57.20 +4.76%
BenchmarkChanUncontended-4 27.40 28.70 +4.74%
BenchmarkChanUncontended-8 14.60 15.10 +3.42%
BenchmarkChanContended 108.00 114.00 +5.56%
BenchmarkChanContended-2 621.00 617.00 -0.64%
BenchmarkChanContended-4 759.00 677.00 -10.80%
BenchmarkChanContended-8 1635.00 1517.00 -7.22%
BenchmarkChanSync 299.00 256.00 -14.38%
BenchmarkChanSync-2 5055.00 4624.00 -8.53%
BenchmarkChanSync-4 4998.00 4680.00 -6.36%
BenchmarkChanSync-8 5019.00 4760.00 -5.16%
BenchmarkChanProdCons0 316.00 274.00 -13.29%
BenchmarkChanProdCons0-2 1280.00 617.00 -51.80%
BenchmarkChanProdCons0-4 2433.00 1332.00 -45.25%
BenchmarkChanProdCons0-8 3651.00 1934.00 -47.03%
BenchmarkChanProdCons10 153.00 152.00 -0.65%
BenchmarkChanProdCons10-2 626.00 581.00 -7.19%
BenchmarkChanProdCons10-4 1440.00 1323.00 -8.12%
BenchmarkChanProdCons10-8 2036.00 2017.00 -0.93%
R=rsc, ken
CC=golang-dev
https://golang.org/cl/4790042
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2011-07-20 11:51:25 -04:00 |
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