• Dmitriy Vyukov's avatar
    sync: add fast paths to WaitGroup · ee6e1a3f
    Dmitriy Vyukov authored
    benchmark                                        old ns/op    new ns/op    delta
    BenchmarkWaitGroupUncontended                        93.50        33.60  -64.06%
    BenchmarkWaitGroupUncontended-2                      44.30        16.90  -61.85%
    BenchmarkWaitGroupUncontended-4                      21.80         8.47  -61.15%
    BenchmarkWaitGroupUncontended-8                      12.10         4.86  -59.83%
    BenchmarkWaitGroupUncontended-16                      7.38         3.35  -54.61%
    BenchmarkWaitGroupAddDone                            58.40        33.70  -42.29%
    BenchmarkWaitGroupAddDone-2                         293.00        85.80  -70.72%
    BenchmarkWaitGroupAddDone-4                         243.00        51.10  -78.97%
    BenchmarkWaitGroupAddDone-8                         236.00        52.20  -77.88%
    BenchmarkWaitGroupAddDone-16                        215.00        43.30  -79.86%
    BenchmarkWaitGroupAddDoneWork                       826.00       794.00   -3.87%
    BenchmarkWaitGroupAddDoneWork-2                     450.00       424.00   -5.78%
    BenchmarkWaitGroupAddDoneWork-4                     277.00       220.00  -20.58%
    BenchmarkWaitGroupAddDoneWork-8                     440.00       116.00  -73.64%
    BenchmarkWaitGroupAddDoneWork-16                    569.00        66.50  -88.31%
    BenchmarkWaitGroupWait                               29.00         8.04  -72.28%
    BenchmarkWaitGroupWait-2                             74.10         4.15  -94.40%
    BenchmarkWaitGroupWait-4                            117.00         2.30  -98.03%
    BenchmarkWaitGroupWait-8                            111.00         1.31  -98.82%
    BenchmarkWaitGroupWait-16                           104.00         1.27  -98.78%
    BenchmarkWaitGroupWaitWork                          802.00       792.00   -1.25%
    BenchmarkWaitGroupWaitWork-2                        411.00       401.00   -2.43%
    BenchmarkWaitGroupWaitWork-4                        210.00       199.00   -5.24%
    BenchmarkWaitGroupWaitWork-8                        206.00       105.00  -49.03%
    BenchmarkWaitGroupWaitWork-16                       334.00        54.40  -83.71%
    
    R=rsc
    CC=golang-dev
    https://golang.org/cl/4672050
    ee6e1a3f
waitgroup.go 2.47 KB