Subversion Repositories openrisc

// $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()
        memstats := new(runtime.MemStats)
        runtime.ReadMemStats(memstats)
        alloc := memstats.Alloc

        // second time shouldn't increase footprint by much
        go sender(c, 100000)
        receiver(c, dummy, 100000)
        runtime.GC()
        runtime.ReadMemStats(memstats)

        if memstats.Alloc-alloc > 1e5 {
                println("BUG: too much memory for 100,000 selects:", memstats.Alloc-alloc)
        }
}