go /
go /
8ce8adbe7a194cba2819b533b603d92df40fe799 runtime: tune append crossover on amd64 and 386
Fixes #4963.
Sets the append crossover to 0 on intel platforms.
Results for linux/amd64 Core i5 SNB
benchmark old ns/op new ns/op delta
BenchmarkAppend 102 104 +1.96%
BenchmarkAppend1Byte 10 11 +0.92%
BenchmarkAppend4Bytes 15 11 -28.10%
BenchmarkAppend7Bytes 17 12 -32.58%
BenchmarkAppend8Bytes 18 12 -36.17%
BenchmarkAppend15Bytes 24 11 -55.02%
BenchmarkAppend16Bytes 25 11 -56.03%
BenchmarkAppend32Bytes 11 12 +4.31%
BenchmarkAppendStr1Byte 8 9 +13.99%
BenchmarkAppendStr4Bytes 11 9 -17.52%
BenchmarkAppendStr8Bytes 14 9 -35.70%
BenchmarkAppendStr16Bytes 21 9 -55.19%
BenchmarkAppendStr32Bytes 10 10 -5.66%
BenchmarkAppendSpecialCase 49 52 +7.96%
Results for linux/386 Atom(TM) CPU 330 @ 1.60GHz
benchmark old ns/op new ns/op delta
BenchmarkAppend 219 218 -0.46%
BenchmarkAppend1Byte 75 72 -3.44%
BenchmarkAppend4Bytes 92 73 -19.87%
BenchmarkAppend7Bytes 108 74 -31.20%
BenchmarkAppend8Bytes 116 74 -35.95%
BenchmarkAppend15Bytes 162 77 -52.22%
BenchmarkAppend16Bytes 169 77 -54.20%
BenchmarkAppend32Bytes 88 86 -2.38%
BenchmarkAppendStr1Byte 57 59 +3.32%
BenchmarkAppendStr4Bytes 72 59 -17.40%
BenchmarkAppendStr8Bytes 92 60 -34.70%
BenchmarkAppendStr16Bytes 141 63 -54.89%
BenchmarkAppendStr32Bytes 75 73 -2.64%
BenchmarkAppendSpecialCase 270 270 +0.00%
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/12440044
4 files changed
