mirror of
https://github.com/golang/go
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1fa7029425
Combine NoScan allocations < 16 bytes into a single memory block.
Reduces number of allocations on json/garbage benchmarks by 10+%.
json-1
allocated 8039872 7949194 -1.13%
allocs 105774 93776 -11.34%
cputime 156200000 100700000 -35.53%
gc-pause-one 4908873 3814853 -22.29%
gc-pause-total 2748969 2899288 +5.47%
rss 52674560 43560960 -17.30%
sys-gc 3796976 3256304 -14.24%
sys-heap 43843584 35192832 -19.73%
sys-other 5589312 5310784 -4.98%
sys-stack 393216 393216 +0.00%
sys-total 53623088 44153136 -17.66%
time 156193436 100886714 -35.41%
virtual-mem 256548864 256540672 -0.00%
garbage-1
allocated 2996885 2932982 -2.13%
allocs 62904 55200 -12.25%
cputime 17470000 17400000 -0.40%
gc-pause-one 932757485 925806143 -0.75%
gc-pause-total 4663787 4629030 -0.75%
rss 1151074304 1133670400 -1.51%
sys-gc 66068352 65085312 -1.49%
sys-heap 1039728640 1024065536 -1.51%
sys-other 38038208 37485248 -1.45%
sys-stack 8650752 8781824 +1.52%
sys-total 1152485952 1135417920 -1.48%
time 17478088 17418005 -0.34%
virtual-mem 1343709184 1324204032 -1.45%
LGTM=iant, bradfitz
R=golang-codereviews, dave, iant, rsc, bradfitz
CC=golang-codereviews, khr
https://golang.org/cl/38750047
42 lines
653 B
Go
42 lines
653 B
Go
// run
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// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"os"
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"runtime"
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"testing"
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)
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type T struct { int }
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var globl *T
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func F() {
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t := &T{}
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globl = t
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}
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func G() {
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t := &T{}
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_ = t
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}
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func main() {
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nf := testing.AllocsPerRun(100, F)
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ng := testing.AllocsPerRun(100, G)
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if int(nf) > 1 {
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fmt.Printf("AllocsPerRun(100, F) = %v, want 1\n", nf)
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os.Exit(1)
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}
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if int(ng) != 0 && (runtime.Compiler != "gccgo" || int(ng) != 1) {
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fmt.Printf("AllocsPerRun(100, G) = %v, want 0\n", ng)
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os.Exit(1)
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}
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}
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