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rand_bench_std_test.go
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rand_bench_std_test.go
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// Copyright 2022 Gregory Petrosyan <gregory.petrosyan@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
//go:build benchstd
package rand_test
import (
"math"
"math/rand"
"testing"
)
var (
sinkRand *rand.Rand
)
func BenchmarkUint64(b *testing.B) {
b.RunParallel(func(pb *testing.PB) {
var s uint64
b.SetBytes(8)
for pb.Next() {
s = rand.Uint64()
}
sinkUint64 = s
})
}
func BenchmarkFloat64(b *testing.B) {
b.RunParallel(func(pb *testing.PB) {
var s float64
for pb.Next() {
s = rand.Float64()
}
sinkFloat64 = s
})
}
func BenchmarkIntn(b *testing.B) {
b.RunParallel(func(pb *testing.PB) {
var s int
for pb.Next() {
s = rand.Intn(small)
}
sinkInt = s
})
}
func BenchmarkIntn_Big(b *testing.B) {
b.RunParallel(func(pb *testing.PB) {
var s int
for pb.Next() {
s = rand.Intn(math.MaxInt - small)
}
sinkInt = s
})
}
func BenchmarkRand_New(b *testing.B) {
var s *rand.Rand
b.ReportAllocs()
for i := 0; i < b.N; i++ {
s = rand.New(rand.NewSource(int64(i)))
}
sinkRand = s
}
func BenchmarkRand_ExpFloat64(b *testing.B) {
var s float64
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.ExpFloat64()
}
sinkFloat64 = s
}
func BenchmarkRand_Float32(b *testing.B) {
var s float32
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Float32()
}
sinkFloat32 = s
}
func BenchmarkRand_Float64(b *testing.B) {
var s float64
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Float64()
}
sinkFloat64 = s
}
func BenchmarkRand_Int(b *testing.B) {
var s int
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Int()
}
sinkInt = s
}
func BenchmarkRand_Int31(b *testing.B) {
var s int32
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Int31()
}
sinkInt32 = s
}
func BenchmarkRand_Int31n(b *testing.B) {
var s int32
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Int31n(small)
}
sinkInt32 = s
}
func BenchmarkRand_Int31n_Big(b *testing.B) {
var s int32
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Int31n(math.MaxInt32 - small)
}
sinkInt32 = s
}
func BenchmarkRand_Int63(b *testing.B) {
var s int64
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Int63()
}
sinkInt64 = s
}
func BenchmarkRand_Int63n(b *testing.B) {
var s int64
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Int63n(small)
}
sinkInt64 = s
}
func BenchmarkRand_Int63n_Big(b *testing.B) {
var s int64
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Int63n(math.MaxInt64 - small)
}
sinkInt64 = s
}
func BenchmarkRand_Intn(b *testing.B) {
var s int
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Intn(small)
}
sinkInt = s
}
func BenchmarkRand_Intn_Big(b *testing.B) {
var s int
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.Intn(math.MaxInt - small)
}
sinkInt = s
}
func BenchmarkRand_NormFloat64(b *testing.B) {
var s float64
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
s = r.NormFloat64()
}
sinkFloat64 = s
}
func BenchmarkRand_Perm(b *testing.B) {
b.ReportAllocs()
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
r.Perm(tiny)
}
}
func BenchmarkRand_Read(b *testing.B) {
r := rand.New(rand.NewSource(1))
p := make([]byte, 256)
b.SetBytes(int64(len(p)))
for i := 0; i < b.N; i++ {
_, _ = r.Read(p[:])
}
}
func BenchmarkRand_Seed(b *testing.B) {
r := rand.New(rand.NewSource(1))
for i := 0; i < b.N; i++ {
r.Seed(int64(i))
}
}
func BenchmarkRand_Shuffle(b *testing.B) {
r := rand.New(rand.NewSource(1))
a := make([]int, tiny)
for i := 0; i < b.N; i++ {
r.Shuffle(len(a), func(i, j int) { a[i], a[j] = a[j], a[i] })
}
}
func BenchmarkRand_ShuffleOverhead(b *testing.B) {
r := rand.New(rand.NewSource(1))
a := make([]int, tiny)
for i := 0; i < b.N; i++ {
r.Shuffle(len(a), func(i, j int) {})
}
}
func BenchmarkRand_Uint32(b *testing.B) {
var s uint32
r := rand.New(rand.NewSource(1))
b.SetBytes(4)
for i := 0; i < b.N; i++ {
s = r.Uint32()
}
sinkUint32 = s
}
func BenchmarkRand_Uint64(b *testing.B) {
var s uint64
r := rand.New(rand.NewSource(1))
b.SetBytes(8)
for i := 0; i < b.N; i++ {
s = r.Uint64()
}
sinkUint64 = s
}