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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [runtime/] [proc_test.go] - Blame information for rev 747

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1 747 jeremybenn 
// 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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package runtime_test
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import (
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        "runtime"
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        "sync/atomic"
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        "testing"
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)
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var stop = make(chan bool, 1)
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func perpetuumMobile() {
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        select {
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        case <-stop:
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        default:
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                go perpetuumMobile()
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        }
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}
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func TestStopTheWorldDeadlock(t *testing.T) {
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        if testing.Short() {
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                t.Logf("skipping during short test")
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                return
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        }
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        maxprocs := runtime.GOMAXPROCS(3)
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        compl := make(chan bool, 2)
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        go func() {
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                for i := 0; i != 1000; i += 1 {
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                        runtime.GC()
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                }
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                compl <- true
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        }()
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        go func() {
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                for i := 0; i != 1000; i += 1 {
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                        runtime.GOMAXPROCS(3)
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                }
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                compl <- true
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        }()
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        go perpetuumMobile()
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        <-compl
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        <-compl
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        stop <- true
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        runtime.GOMAXPROCS(maxprocs)
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}
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func stackGrowthRecursive(i int) {
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        var pad [128]uint64
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        if i != 0 && pad[0] == 0 {
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                stackGrowthRecursive(i - 1)
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        }
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}
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func BenchmarkStackGrowth(b *testing.B) {
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        const CallsPerSched = 1000
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        procs := runtime.GOMAXPROCS(-1)
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        N := int32(b.N / CallsPerSched)
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        c := make(chan bool, procs)
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        for p := 0; p < procs; p++ {
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                go func() {
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                        for atomic.AddInt32(&N, -1) >= 0 {
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                                runtime.Gosched()
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                                for g := 0; g < CallsPerSched; g++ {
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                                        stackGrowthRecursive(10)
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                                }
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                        }
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                        c <- true
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                }()
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        }
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        for p := 0; p < procs; p++ {
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                <-c
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        }
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}
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func BenchmarkSyscall(b *testing.B) {
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        const CallsPerSched = 1000
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        procs := runtime.GOMAXPROCS(-1)
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        N := int32(b.N / CallsPerSched)
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        c := make(chan bool, procs)
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        for p := 0; p < procs; p++ {
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                go func() {
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                        for atomic.AddInt32(&N, -1) >= 0 {
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                                runtime.Gosched()
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                                for g := 0; g < CallsPerSched; g++ {
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                                        runtime.Entersyscall()
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                                        runtime.Exitsyscall()
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                                }
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                        }
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                        c <- true
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                }()
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        }
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        for p := 0; p < procs; p++ {
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                <-c
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        }
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}
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func BenchmarkSyscallWork(b *testing.B) {
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        const CallsPerSched = 1000
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        const LocalWork = 100
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        procs := runtime.GOMAXPROCS(-1)
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        N := int32(b.N / CallsPerSched)
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        c := make(chan bool, procs)
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        for p := 0; p < procs; p++ {
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                go func() {
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                        foo := 42
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                        for atomic.AddInt32(&N, -1) >= 0 {
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                                runtime.Gosched()
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                                for g := 0; g < CallsPerSched; g++ {
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                                        runtime.Entersyscall()
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                                        for i := 0; i < LocalWork; i++ {
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                                                foo *= 2
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                                                foo /= 2
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                                        }
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                                        runtime.Exitsyscall()
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                                }
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                        }
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                        c <- foo == 42
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                }()
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        }
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        for p := 0; p < procs; p++ {
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                <-c
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        }
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}

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