github.com/c12o16h1/go/src@v0.0.0-20200114212001-5a151c0f00ed/runtime/internal/atomic/bench_test.go (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package atomic_test
     6  
     7  import (
     8  	"runtime/internal/atomic"
     9  	"testing"
    10  )
    11  
    12  var sink interface{}
    13  
    14  func BenchmarkAtomicLoad64(b *testing.B) {
    15  	var x uint64
    16  	sink = &x
    17  	for i := 0; i < b.N; i++ {
    18  		_ = atomic.Load64(&x)
    19  	}
    20  }
    21  
    22  func BenchmarkAtomicStore64(b *testing.B) {
    23  	var x uint64
    24  	sink = &x
    25  	for i := 0; i < b.N; i++ {
    26  		atomic.Store64(&x, 0)
    27  	}
    28  }
    29  
    30  func BenchmarkAtomicLoad(b *testing.B) {
    31  	var x uint32
    32  	sink = &x
    33  	for i := 0; i < b.N; i++ {
    34  		_ = atomic.Load(&x)
    35  	}
    36  }
    37  
    38  func BenchmarkAtomicStore(b *testing.B) {
    39  	var x uint32
    40  	sink = &x
    41  	for i := 0; i < b.N; i++ {
    42  		atomic.Store(&x, 0)
    43  	}
    44  }
    45  
    46  func BenchmarkAnd8(b *testing.B) {
    47  	var x [512]uint8 // give byte its own cache line
    48  	sink = &x
    49  	for i := 0; i < b.N; i++ {
    50  		atomic.And8(&x[255], uint8(i))
    51  	}
    52  }
    53  
    54  func BenchmarkAnd8Parallel(b *testing.B) {
    55  	var x [512]uint8 // give byte its own cache line
    56  	sink = &x
    57  	b.RunParallel(func(pb *testing.PB) {
    58  		i := uint8(0)
    59  		for pb.Next() {
    60  			atomic.And8(&x[255], i)
    61  			i++
    62  		}
    63  	})
    64  }
    65  
    66  func BenchmarkOr8(b *testing.B) {
    67  	var x [512]uint8 // give byte its own cache line
    68  	sink = &x
    69  	for i := 0; i < b.N; i++ {
    70  		atomic.Or8(&x[255], uint8(i))
    71  	}
    72  }
    73  
    74  func BenchmarkOr8Parallel(b *testing.B) {
    75  	var x [512]uint8 // give byte its own cache line
    76  	sink = &x
    77  	b.RunParallel(func(pb *testing.PB) {
    78  		i := uint8(0)
    79  		for pb.Next() {
    80  			atomic.Or8(&x[255], i)
    81  			i++
    82  		}
    83  	})
    84  }
    85  
    86  func BenchmarkXadd(b *testing.B) {
    87  	var x uint32
    88  	ptr := &x
    89  	b.RunParallel(func(pb *testing.PB) {
    90  		for pb.Next() {
    91  			atomic.Xadd(ptr, 1)
    92  		}
    93  	})
    94  }
    95  
    96  func BenchmarkXadd64(b *testing.B) {
    97  	var x uint64
    98  	ptr := &x
    99  	b.RunParallel(func(pb *testing.PB) {
   100  		for pb.Next() {
   101  			atomic.Xadd64(ptr, 1)
   102  		}
   103  	})
   104  }