mirror of
https://github.com/golang/go
synced 2024-11-19 21:04:43 -07:00
842c906e2e
Unexports runtime.MemStats and rename MemStatsType to MemStats. The new accessor requires passing a pointer to a user-allocated MemStats structure. Fixes #2572. R=bradfitz, rsc, bradfitz, gustavo CC=golang-dev, remy https://golang.org/cl/5616072
52 lines
980 B
Go
52 lines
980 B
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
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// Copyright 2010 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 "runtime"
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func sender(c chan int, n int) {
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for i := 0; i < n; i++ {
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c <- 1
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}
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}
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func receiver(c, dummy chan int, n int) {
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for i := 0; i < n; i++ {
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select {
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case <-c:
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// nothing
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case <-dummy:
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panic("dummy")
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}
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}
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}
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func main() {
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runtime.MemProfileRate = 0
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c := make(chan int)
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dummy := make(chan int)
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// warm up
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go sender(c, 100000)
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receiver(c, dummy, 100000)
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runtime.GC()
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memstats := new(runtime.MemStats)
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runtime.ReadMemStats(memstats)
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alloc := memstats.Alloc
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// second time shouldn't increase footprint by much
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go sender(c, 100000)
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receiver(c, dummy, 100000)
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runtime.GC()
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runtime.ReadMemStats(memstats)
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if memstats.Alloc-alloc > 1e5 {
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println("BUG: too much memory for 100,000 selects:", memstats.Alloc-alloc)
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}
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}
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