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

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1 747 jeremybenn 
// Copyright 2009 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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func BenchmarkSemaUncontended(b *testing.B) {
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        type PaddedSem struct {
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                sem uint32
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                pad [32]uint32
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        }
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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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                        sem := new(PaddedSem)
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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.Semrelease(&sem.sem)
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                                        runtime.Semacquire(&sem.sem)
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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 benchmarkSema(b *testing.B, block, work bool) {
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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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        c2 := make(chan bool, procs/2)
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        sem := uint32(0)
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        if block {
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                for p := 0; p < procs/2; p++ {
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                        go func() {
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                                runtime.Semacquire(&sem)
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                                c2 <- true
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                        }()
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                }
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        }
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        for p := 0; p < procs; p++ {
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                go func() {
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                        foo := 0
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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.Semrelease(&sem)
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                                        if work {
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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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                                        }
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                                        runtime.Semacquire(&sem)
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                                }
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                        }
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                        c <- foo == 42
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                        runtime.Semrelease(&sem)
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                }()
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        }
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        if block {
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                for p := 0; p < procs/2; p++ {
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                        <-c2
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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 BenchmarkSemaSyntNonblock(b *testing.B) {
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        benchmarkSema(b, false, false)
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}
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func BenchmarkSemaSyntBlock(b *testing.B) {
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        benchmarkSema(b, true, false)
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}
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func BenchmarkSemaWorkNonblock(b *testing.B) {
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        benchmarkSema(b, false, true)
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}
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func BenchmarkSemaWorkBlock(b *testing.B) {
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        benchmarkSema(b, true, true)
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}

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