cryptorand_test.go

package test

import (
	"crypto/rand"
	"encoding/binary"
	"testing"
	"unsafe"
)

func BenchmarkCryptoRandRead(b *testing.B) {
	b.SetBytes(8)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		var seed int64
		if err := binary.Read(rand.Reader, binary.LittleEndian, &seed); err != nil {
			panic(err)
		}
		_ = seed
	}
}

func BenchmarkCryptoRandReadUnsafe(b *testing.B) {
	b.SetBytes(8)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		var buf [unsafe.Sizeof(int64(0))]byte
		if _, err := rand.Read(buf[:]); err != nil {
			panic(err)
		}
		seed := (*int64)(unsafe.Pointer(&buf))
		_ = seed
	}
}

goos: darwin
goarch: amd64
BenchmarkCryptoRandRead-8         	 2000000	       665 ns/op	  12.02 MB/s
BenchmarkCryptoRandReadUnsafe-8   	 2000000	       647 ns/op	  12.35 MB/s
PASS
ok  	_/tmp	3.959s