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https://github.com/golang/go
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b5b11bdbc6
Per the comment at top, this test is about whether the GC runs during init, but it was testing more than that, and testing how much the GC collected in a certain amount of time. Instead, loosen this test to just see whether it ran at all and not how well it did. Fixes #9848 Change-Id: I31da7dd769140d7b49aa6c149a543fae6076aa5e Reviewed-on: https://go-review.googlesource.com/4820 Reviewed-by: Rick Hudson <rlh@golang.org> Reviewed-by: Russ Cox <rsc@golang.org>
54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
// run
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// Copyright 2011 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 goroutines and garbage collection run during init.
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package main
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import "runtime"
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var x []byte
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func init() {
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c := make(chan int)
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go send(c)
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<-c
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const N = 1000
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const MB = 1 << 20
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b := make([]byte, MB)
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for i := range b {
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b[i] = byte(i%10 + '0')
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}
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s := string(b)
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memstats := new(runtime.MemStats)
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runtime.ReadMemStats(memstats)
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sys, numGC := memstats.Sys, memstats.NumGC
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// Generate 1,000 MB of garbage, only retaining 1 MB total.
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for i := 0; i < N; i++ {
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x = []byte(s)
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}
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// Verify that the garbage collector ran by seeing if we
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// allocated fewer than N*MB bytes from the system.
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runtime.ReadMemStats(memstats)
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sys1, numGC1 := memstats.Sys, memstats.NumGC
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if sys1-sys >= N*MB || numGC1 == numGC {
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println("allocated 1000 chunks of", MB, "and used ", sys1-sys, "memory")
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println("numGC went", numGC, "to", numGC)
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panic("init1")
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}
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}
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func send(c chan int) {
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c <- 1
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}
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func main() {
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}
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