Created
March 28, 2024 00:02
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Slice vs []byte equality in golang
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package main | |
import ( | |
"bytes" | |
"crypto/rand" | |
"slices" | |
"testing" | |
) | |
// generateRandomByteSlice generates a random byte slice of the given size. | |
func generateRandomByteSlice(size int) []byte { | |
slice := make([]byte, size) | |
if _, err := rand.Read(slice); err != nil { | |
panic("failed to generate random byte slice: " + err.Error()) | |
} | |
return slice | |
} | |
var ( | |
// Generate 5KB random byte slices once for all benchmarks to use. | |
a = generateRandomByteSlice(5 * 1024) // 5KB | |
) | |
// BenchmarkBytesEqual benchmarks the bytes.Equal function for the same 5KB random byte slices. | |
func BenchmarkBytesEqual(b *testing.B) { | |
b.ResetTimer() // Ensure the setup time is not included. | |
for i := 0; i < b.N; i++ { | |
_ = bytes.Equal(a, a) | |
} | |
} | |
// BenchmarkSlicesEqualByteSlice benchmarks the slices.Equal function for the same 5KB random byte slices. | |
func BenchmarkSlicesEqualByteSlice(b *testing.B) { | |
b.ResetTimer() // Reset the timer to exclude setup time from the benchmark. | |
for i := 0; i < b.N; i++ { | |
_ = slices.Equal(a, a) | |
} | |
} |
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$ go test -bench Equal | |
goos: darwin | |
goarch: amd64 | |
pkg: otpguard | |
cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz | |
BenchmarkBytesEqual-12 1000000000 0.2457 ns/op | |
BenchmarkSlicesEqualByteSlice-12 482109 2485 ns/op | |
PASS | |
ok otpguard 2.780s |
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