hash_test.go

package hash_test

import (
	"fmt"
	"strings"
	"testing"
	"unsafe"

	"github.com/segmentio/fasthash/fnv1a"
)

func BenchmarkCopies(b *testing.B) {
	testCases := []string{
		strings.Repeat("a", 8),
		strings.Repeat("a", 64),
		strings.Repeat("a", 128),
	}

	for _, s := range testCases {
		byteArr := []byte(s)

		b.Run(fmt.Sprintf("string%d", len(s)), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				fnv1a.HashString64(s)
			}
		})

		b.Run(fmt.Sprintf("[%d]byte", len(s)), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				fnv1a.HashString64(string(byteArr))
			}
		})

		b.Run(fmt.Sprintf("unsafe%d", len(s)), func(b *testing.B) {
			for i := 0; i < b.N; i++ {
				fnv1a.HashString64(*(*string)(unsafe.Pointer(&byteArr)))
			}
		})
	}
}

/*
goos: linux
goarch: amd64
pkg: axicode.axiom.co/watchmakers/eventdb/common
BenchmarkCopies/string8-8         	100000000	        11.4 ns/op	       0 B/op	       0 allocs/op
BenchmarkCopies/[8]byte-8         	64843872	        18.3 ns/op	       0 B/op	       0 allocs/op
BenchmarkCopies/unsafe8-8         	100000000	        10.9 ns/op	       0 B/op	       0 allocs/op
BenchmarkCopies/string64-8        	11543194	       101 ns/op	       0 B/op	       0 allocs/op
BenchmarkCopies/[64]byte-8        	 4585114	       373 ns/op	      64 B/op	       1 allocs/op
BenchmarkCopies/unsafe64-8        	11537672	        98.9 ns/op	       0 B/op	       0 allocs/op
BenchmarkCopies/string128-8       	 4799910	       234 ns/op	       0 B/op	       0 allocs/op
BenchmarkCopies/[128]byte-8       	 2291605	       573 ns/op	     128 B/op	       1 allocs/op
BenchmarkCopies/unsafe128-8       	 5121356	       243 ns/op	       0 B/op	       0 allocs/op
PASS
*/