libgo/go/runtime/rand_test.go

   1 // Copyright 2017 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 runtime_test
   6
   7 import (
   8         . "runtime"
   9         "strconv"
  10         "testing"
  11 )
  12
  13 func BenchmarkFastrand(b *testing.B) {
  14         b.RunParallel(func(pb *testing.PB) {
  15                 for pb.Next() {
  16                         Fastrand()
  17                 }
  18         })
  19 }
  20
  21 func BenchmarkFastrandHashiter(b *testing.B) {
  22         var m = make(map[int]int, 10)
  23         for i := 0; i < 10; i++ {
  24                 m[i] = i
  25         }
  26         b.RunParallel(func(pb *testing.PB) {
  27                 for pb.Next() {
  28                         for range m {
  29                                 break
  30                         }
  31                 }
  32         })
  33 }
  34
  35 var sink32 uint32
  36
  37 func BenchmarkFastrandn(b *testing.B) {
  38         for n := uint32(2); n <= 5; n++ {
  39                 b.Run(strconv.Itoa(int(n)), func(b *testing.B) {
  40                         for i := 0; i < b.N; i++ {
  41                                 sink32 = Fastrandn(n)
  42                         }
  43                 })
  44         }
  45 }