route/vendor/go.uber.org/atomic/stress_test.go

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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package atomic
import (
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"math"
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"runtime"
"sync"
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"sync/atomic"
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"testing"
)
const (
_parallelism = 4
_iterations = 1000
)
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var _stressTests = map[string]func() func(){
"i32/std": stressStdInt32,
"i32": stressInt32,
"i64/std": stressStdInt32,
"i64": stressInt64,
"u32/std": stressStdUint32,
"u32": stressUint32,
"u64/std": stressStdUint64,
"u64": stressUint64,
"f64": stressFloat64,
"bool": stressBool,
"string": stressString,
}
func TestStress(t *testing.T) {
for name, ff := range _stressTests {
t.Run(name, func(t *testing.T) {
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(_parallelism))
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start := make(chan struct{})
var wg sync.WaitGroup
wg.Add(_parallelism)
f := ff()
for i := 0; i < _parallelism; i++ {
go func() {
defer wg.Done()
<-start
for j := 0; j < _iterations; j++ {
f()
}
}()
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}
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close(start)
wg.Wait()
})
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}
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}
func BenchmarkStress(b *testing.B) {
for name, ff := range _stressTests {
b.Run(name, func(b *testing.B) {
f := ff()
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b.Run("serial", func(b *testing.B) {
for i := 0; i < b.N; i++ {
f()
}
})
b.Run("parallel", func(b *testing.B) {
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
f()
}
})
})
})
}
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}
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func stressStdInt32() func() {
var atom int32
return func() {
atomic.LoadInt32(&atom)
atomic.AddInt32(&atom, 1)
atomic.AddInt32(&atom, -2)
atomic.AddInt32(&atom, 1)
atomic.AddInt32(&atom, -1)
atomic.CompareAndSwapInt32(&atom, 1, 0)
atomic.SwapInt32(&atom, 5)
atomic.StoreInt32(&atom, 1)
}
}
func stressInt32() func() {
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var atom Int32
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return func() {
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atom.Load()
atom.Add(1)
atom.Sub(2)
atom.Inc()
atom.Dec()
atom.CAS(1, 0)
atom.Swap(5)
atom.Store(1)
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}
}
func stressStdInt64() func() {
var atom int64
return func() {
atomic.LoadInt64(&atom)
atomic.AddInt64(&atom, 1)
atomic.AddInt64(&atom, -2)
atomic.AddInt64(&atom, 1)
atomic.AddInt64(&atom, -1)
atomic.CompareAndSwapInt64(&atom, 1, 0)
atomic.SwapInt64(&atom, 5)
atomic.StoreInt64(&atom, 1)
}
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}
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func stressInt64() func() {
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var atom Int64
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return func() {
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atom.Load()
atom.Add(1)
atom.Sub(2)
atom.Inc()
atom.Dec()
atom.CAS(1, 0)
atom.Swap(5)
atom.Store(1)
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}
}
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func stressStdUint32() func() {
var atom uint32
return func() {
atomic.LoadUint32(&atom)
atomic.AddUint32(&atom, 1)
// Adding `MaxUint32` is the same as subtracting 1
atomic.AddUint32(&atom, math.MaxUint32-1)
atomic.AddUint32(&atom, 1)
atomic.AddUint32(&atom, math.MaxUint32)
atomic.CompareAndSwapUint32(&atom, 1, 0)
atomic.SwapUint32(&atom, 5)
atomic.StoreUint32(&atom, 1)
}
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}
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func stressUint32() func() {
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var atom Uint32
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return func() {
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atom.Load()
atom.Add(1)
atom.Sub(2)
atom.Inc()
atom.Dec()
atom.CAS(1, 0)
atom.Swap(5)
atom.Store(1)
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}
}
func stressStdUint64() func() {
var atom uint64
return func() {
atomic.LoadUint64(&atom)
atomic.AddUint64(&atom, 1)
// Adding `MaxUint64` is the same as subtracting 1
atomic.AddUint64(&atom, math.MaxUint64-1)
atomic.AddUint64(&atom, 1)
atomic.AddUint64(&atom, math.MaxUint64)
atomic.CompareAndSwapUint64(&atom, 1, 0)
atomic.SwapUint64(&atom, 5)
atomic.StoreUint64(&atom, 1)
}
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}
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func stressUint64() func() {
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var atom Uint64
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return func() {
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atom.Load()
atom.Add(1)
atom.Sub(2)
atom.Inc()
atom.Dec()
atom.CAS(1, 0)
atom.Swap(5)
atom.Store(1)
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}
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}
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func stressFloat64() func() {
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var atom Float64
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return func() {
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atom.Load()
atom.CAS(1.0, 0.1)
atom.Add(1.1)
atom.Sub(0.2)
atom.Store(1.0)
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}
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}
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func stressBool() func() {
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var atom Bool
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return func() {
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atom.Load()
atom.Store(false)
atom.Swap(true)
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atom.CAS(true, false)
atom.CAS(true, false)
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atom.Load()
atom.Toggle()
atom.Toggle()
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}
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}
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func stressString() func() {
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var atom String
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return func() {
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atom.Load()
atom.Store("abc")
atom.Load()
atom.Store("def")
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atom.Load()
atom.Store("")
}
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}