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// Copyright 2019+ Klaus Post. All rights reserved.
// License information can be found in the LICENSE file.
package zstd
import (
"flag"
"fmt"
"io"
"log"
"os"
"runtime"
"runtime/pprof"
"strings"
"testing"
"time"
)
var isRaceTest bool
// Fuzzing tweaks:
var fuzzStartF = flag.Int("fuzz-start", int(SpeedFastest), "Start fuzzing at this level")
var fuzzEndF = flag.Int("fuzz-end", int(SpeedBestCompression), "End fuzzing at this level (inclusive)")
var fuzzMaxF = flag.Int("fuzz-max", 1<<20, "Maximum input size")
func TestMain(m *testing.M) {
flag.Parse()
ec := m.Run()
if ec == 0 && runtime.NumGoroutine() > 2 {
n := 0
for n < 15 {
n++
time.Sleep(time.Second)
if runtime.NumGoroutine() == 2 {
os.Exit(0)
}
}
fmt.Println("goroutines:", runtime.NumGoroutine())
pprof.Lookup("goroutine").WriteTo(os.Stderr, 1)
os.Exit(1)
}
os.Exit(ec)
}
func TestMatchLen(t *testing.T) {
a := make([]byte, 130)
for i := range a {
a[i] = byte(i)
}
b := append([]byte{}, a...)
check := func(x, y []byte, l int) {
if m := matchLen(x, y); m != l {
t.Error("expected", l, "got", m)
}
}
for l := range a {
a[l] = ^a[l]
check(a, b, l)
check(a[:l], b, l)
a[l] = ^a[l]
}
}
func TestWriterMemUsage(t *testing.T) {
testMem := func(t *testing.T, fn func()) {
var before, after runtime.MemStats
var w io.Writer
if false {
f, err := os.Create(strings.ReplaceAll(fmt.Sprintf("%s.pprof", t.Name()), "/", "_"))
if err != nil {
log.Fatal(err)
}
defer f.Close()
w = f
t.Logf("opened memory profile %s", t.Name())
}
runtime.GC()
runtime.ReadMemStats(&before)
fn()
runtime.GC()
runtime.ReadMemStats(&after)
if w != nil {
pprof.WriteHeapProfile(w)
}
t.Log("wrote profile")
t.Logf("%s: Memory Used: %dMB, %d allocs", t.Name(), (after.HeapInuse-before.HeapInuse)/1024/1024, after.HeapObjects-before.HeapObjects)
}
data := make([]byte, 10<<20)
t.Run("enc-all-lower", func(t *testing.T) {
for level := SpeedFastest; level <= SpeedBestCompression; level++ {
t.Run(fmt.Sprint("level-", level), func(t *testing.T) {
var zr *Encoder
var err error
dst := make([]byte, 0, len(data)*2)
testMem(t, func() {
zr, err = NewWriter(io.Discard, WithEncoderConcurrency(32), WithEncoderLevel(level), WithLowerEncoderMem(false), WithWindowSize(1<<20))
if err != nil {
t.Fatal(err)
}
for i := 0; i < 100; i++ {
_ = zr.EncodeAll(data, dst[:0])
}
})
zr.Close()
})
}
})
}
var data = []byte{1, 2, 3}
func newZstdWriter() (*Encoder, error) {
return NewWriter(
io.Discard,
WithEncoderLevel(SpeedBetterCompression),
WithEncoderConcurrency(16), // we implicitly get this concurrency level if we run on 16 core CPU
WithLowerEncoderMem(false),
WithWindowSize(1<<20),
)
}
func BenchmarkMem(b *testing.B) {
b.Run("flush", func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
w, err := newZstdWriter()
if err != nil {
b.Fatal(err)
}
for j := 0; j < 16; j++ {
w.Reset(io.Discard)
if _, err := w.Write(data); err != nil {
b.Fatal(err)
}
if err := w.Flush(); err != nil {
b.Fatal(err)
}
if err := w.Close(); err != nil {
b.Fatal(err)
}
}
}
})
b.Run("no-flush", func(b *testing.B) {
// Will use encodeAll for block.
b.ReportAllocs()
for i := 0; i < b.N; i++ {
w, err := newZstdWriter()
if err != nil {
b.Fatal(err)
}
for j := 0; j < 16; j++ {
w.Reset(io.Discard)
if _, err := w.Write(data); err != nil {
b.Fatal(err)
}
if err := w.Close(); err != nil {
b.Fatal(err)
}
}
}
})
}
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