mirror of
https://github.com/golang/go
synced 2024-11-22 04:34:39 -07:00
49 lines
888 B
Go
49 lines
888 B
Go
|
// $G $D/$F.go && $L $F.$A && ./$A.out
|
||
|
|
|
||
|
|
// Copyright 2010 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.
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import "runtime"
|
||
|
|
|
||
|
|
func sender(c chan int, n int) {
|
||
|
|
for i := 0; i < n; i++ {
|
||
|
|
c <- 1
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func receiver(c, dummy chan int, n int) {
|
||
|
|
for i := 0; i < n; i++ {
|
||
|
|
select {
|
||
|
|
case <-c:
|
||
|
|
// nothing
|
||
|
|
case <-dummy:
|
||
|
|
panic("dummy")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
runtime.MemProfileRate = 0
|
||
|
|
|
||
|
|
c := make(chan int)
|
||
|
|
dummy := make(chan int)
|
||
|
|
|
||
|
|
// warm up
|
||
|
|
go sender(c, 100000)
|
||
|
|
receiver(c, dummy, 100000)
|
||
|
|
runtime.GC()
|
||
|
|
runtime.MemStats.Alloc = 0
|
||
|
|
|
||
|
|
// second time shouldn't increase footprint by much
|
||
|
|
go sender(c, 100000)
|
||
|
|
receiver(c, dummy, 100000)
|
||
|
|
runtime.GC()
|
||
|
|
|
||
|
|
if runtime.MemStats.Alloc > 1e5 {
|
||
|
|
println("BUG: too much memory for 100,000 selects:", runtime.MemStats.Alloc)
|
||
|
|
}
|
||
|
|
}
|