rand_test.go

package main

// go test -test.bench '.*'

// goos: darwin
// goarch: arm64
// BenchmarkRandRead4KB-8            356580              3335 ns/op
// BenchmarkCryptoRead4KB-8          158610              7540 ns/op

import (
	rand2 "crypto/rand"
	"math/rand"
	"testing"
	"time"
)

var r = make([]byte, 4096)

func RandRead4KB() {
	rand.Read(r)
	_ = r
}

func CryptoRead4KB() {
	rand2.Read(r)
	_ = r
}

func BenchmarkRandRead4KB(b *testing.B) {
	rand.Seed(time.Now().UnixNano())
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		RandRead4KB()
	}
}

func BenchmarkCryptoRead4KB(b *testing.B) {
	for i := 0; i < b.N; i++ {
		CryptoRead4KB()
	}
}