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// run
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Test that goroutines and garbage collection run during init.
package main
import "runtime"
var x []byte
func init() {
c := make(chan int)
go send(c)
<-c
const N = 1000
const MB = 1 << 20
b := make([]byte, MB)
for i := range b {
b[i] = byte(i%10 + '0')
}
s := string(b)
memstats := new(runtime.MemStats)
runtime.ReadMemStats(memstats)
sys, numGC := memstats.Sys, memstats.NumGC
// Generate 1,000 MB of garbage, only retaining 1 MB total.
for i := 0; i < N; i++ {
x = []byte(s)
}
// Verify that the garbage collector ran by seeing if we
// allocated fewer than N*MB bytes from the system.
runtime.ReadMemStats(memstats)
sys1, numGC1 := memstats.Sys, memstats.NumGC
if sys1-sys >= N*MB || numGC1 == numGC {
println("allocated 1000 chunks of", MB, "and used ", sys1-sys, "memory")
println("numGC went", numGC, "to", numGC1)
panic("init1")
}
}
func send(c chan int) {
c <- 1
}
func main() {
}