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// Copyright (c) 2025 Minio Inc. All rights reserved.
// Use of this source code is governed by a license that can be
// found in the LICENSE file.
package crc64nvme
import (
"bytes"
"fmt"
"hash"
"hash/crc64"
"io"
"math/rand"
"runtime"
"sync/atomic"
"testing"
)
var crc64Table = crc64.MakeTable(NVME)
func TestChecksum(t *testing.T) {
if hasAsm {
if hasAsm512 {
testChecksum(t, "asm512-")
hasAsm512 = false
defer func() {
hasAsm512 = true
}()
}
testChecksum(t, "asm-")
hasAsm = false
testChecksum(t, "")
hasAsm = true
} else {
testChecksum(t, "")
}
}
func testChecksum(t *testing.T, asm string) {
sizes := []int{0, 1, 3, 7, 8, 9, 15, 17, 127, 128, 129, 255, 256, 257, 511, 512, 513, 1e3, 1e4, 1e5, 1e6}
for _, size := range sizes {
t.Run(fmt.Sprintf("%ssize=%d", asm, size), func(t *testing.T) {
rng := rand.New(rand.NewSource(int64(size)))
for align := range 16 {
t.Run(fmt.Sprintf("align=%d", align), func(t *testing.T) {
data := make([]byte, size+align)[align:]
rng.Read(data)
ref := crc64.Checksum(data, crc64Table)
got := Checksum(data)
if got != ref {
t.Errorf("got 0x%x, want 0x%x", got, ref)
}
})
}
})
}
}
func TestHasher(t *testing.T) {
if hasAsm {
if hasAsm512 {
testChecksum(t, "asm512-")
hasAsm512 = false
defer func() {
hasAsm512 = true
}()
}
testHasher(t, "asm-")
hasAsm = false
testHasher(t, "")
hasAsm = true
} else {
testHasher(t, "")
}
}
func testHasher(t *testing.T, asm string) {
sizes := []int{0, 1, 3, 7, 8, 9, 15, 17, 127, 128, 129, 255, 256, 257, 383, 384, 385, 1e3, 1e4, 1e5, 1e6}
for _, size := range sizes {
t.Run(fmt.Sprintf("%ssize=%d", asm, size), func(t *testing.T) {
rng := rand.New(rand.NewSource(int64(size)))
data := make([]byte, size)
rng.Read(data)
ref := crc64.Checksum(data, crc64Table)
h := New()
io.CopyBuffer(h, bytes.NewReader(data), make([]byte, 17))
got := h.Sum64()
if got != ref {
t.Errorf("got 0x%x, want 0x%x", got, ref)
}
})
}
}
func TestLoopAlignment(t *testing.T) {
for l := 128; l <= 128*10; l++ {
dataBlock := make([]byte, l)
for i := range dataBlock {
dataBlock[i] = byte(i + 1)
}
// make sure we don't start on an aligned boundary
offset := rand.Intn(16)
data := dataBlock[offset:]
ref := crc64.Checksum(data, crc64Table)
got := update(0, data)
if got != ref {
t.Errorf("got 0x%x, want 0x%x", got, ref)
}
}
}
func setAsm(asm, asm512 bool) (reset func()) {
oldAsm := hasAsm
oldAsm512 := hasAsm512
hasAsm = asm
hasAsm512 = asm512
return func() {
hasAsm = oldAsm
hasAsm512 = oldAsm512
}
}
func BenchmarkCrc64(b *testing.B) {
for _, sz := range []int64{64 << 20, 4 << 20, 1 << 20, 64 << 10, 4 << 10, 1 << 10, 128, 10} {
if hasAsm512 {
b.Run(fmt.Sprint(sz, "-asm512"), func(b *testing.B) {
defer setAsm(true, true)()
bench(b, New(), sz)
})
}
if hasAsm {
b.Run(fmt.Sprint(sz, "-asm"), func(b *testing.B) {
defer setAsm(true, false)()
bench(b, New(), sz)
})
}
b.Run(fmt.Sprint(sz, "-go"), func(b *testing.B) {
defer setAsm(false, false)()
bench(b, New(), sz)
})
b.Run(fmt.Sprint(sz, "-stdlib"), func(b *testing.B) {
bench(b, crc64.New(crc64Table), sz)
})
}
}
func bench(b *testing.B, h hash.Hash64, size int64) {
b.SetBytes(size)
data := make([]byte, size)
for i := range data {
data[i] = byte(i)
}
in := make([]byte, 0, h.Size())
b.ResetTimer()
for i := 0; i < b.N; i++ {
h.Reset()
h.Write(data)
h.Sum(in)
}
}
func benchmarkParallel(b *testing.B, size int) {
hashes := make([]hash.Hash64, runtime.GOMAXPROCS(0))
for i := range hashes {
hashes[i] = New()
}
rng := rand.New(rand.NewSource(0xabadc0cac01a))
data := make([][]byte, runtime.GOMAXPROCS(0))
for i := range data {
data[i] = make([]byte, size)
rng.Read(data[i])
}
b.SetBytes(int64(size))
b.ResetTimer()
counter := uint64(0)
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
index := atomic.AddUint64(&counter, 1)
index = index % uint64(len(data))
hashes[index].Reset()
hashes[index].Write(data[index])
in := make([]byte, 0, hashes[index].Size())
hashes[index].Sum(in)
}
})
}
func BenchmarkParallel(b *testing.B) {
// go test -cpu=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 -bench=Parallel
b.Run("1KB", func(b *testing.B) {
benchmarkParallel(b, 1*1024)
})
b.Run("10KB", func(b *testing.B) {
benchmarkParallel(b, 10*1024)
})
b.Run("1M", func(b *testing.B) {
benchmarkParallel(b, 1*1024*1024)
})
b.Run("50M", func(b *testing.B) {
benchmarkParallel(b, 50*1024*1024)
})
}
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