Dmitriy Vyukov
ee6e1a3ff7
sync: add fast paths to WaitGroup
...
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
2011-07-18 12:35:55 -04:00
Andrew Gerrand
39ffd546bd
sync: fix example code
...
Fixes #1631 .
R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4303046
2011-03-23 14:24:30 +11:00
Gustavo Niemeyer
63457d089e
sync: Proposal for barrier implementation
...
As discussed in the mailing list, this adds a simple barrier
implementation to the sync package which enables one or more
goroutines to wait for a counter to go down to zero.
R=rsc, rog, r
CC=golang-dev
https://golang.org/cl/3770045
2011-02-03 12:39:11 -08:00
