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https://github.com/golang/go
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1c45f98fa3
The select2.go test assumed that the memory allocated between its two samplings of runtime.ReadMemStats is strictly increasing. To avoid failing the tests when this is not true, a greater-than check is introduced before computing the difference in allocated memory. R=golang-dev, r, cshapiro CC=golang-dev https://golang.org/cl/13701046
55 lines
1.0 KiB
Go
55 lines
1.0 KiB
Go
// run
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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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// Test that selects do not consume undue memory.
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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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// Be careful to avoid wraparound.
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if memstats.Alloc > alloc && memstats.Alloc-alloc > 1.1e5 {
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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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