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package glog
import (
"flag"
"io/ioutil"
"runtime"
"sync"
"sync/atomic"
"testing"
"time"
)
// discarder is a flushSyncWriter that discards all data.
// Sync sleeps for 10ms to simulate a disk seek.
type discarder struct {
}
func (d *discarder) Write(data []byte) (int, error) {
return len(data), nil
}
func (d *discarder) Flush() error {
return nil
}
func (d *discarder) Sync() error {
time.Sleep(10 * time.Millisecond)
return nil
}
func (d *discarder) filenames() []string {
return nil
}
// newDiscard sets the log writers to all new byte buffers and returns the old array.
func (s *fileSink) newDiscarders() severityWriters {
return s.swap(severityWriters{new(discarder), new(discarder), new(discarder), new(discarder)})
}
func discardStderr() func() {
se := sinks.stderr.w
sinks.stderr.w = ioutil.Discard
return func() { sinks.stderr.w = se }
}
const message = "benchmark log message"
func benchmarkLog(b *testing.B, log func(...any)) {
defer sinks.file.swap(sinks.file.newDiscarders())
defer discardStderr()()
b.ResetTimer()
for i := 0; i < b.N; i++ {
log(message)
}
b.StopTimer()
}
func benchmarkLogConcurrent(b *testing.B, log func(...any)) {
defer sinks.file.swap(sinks.file.newDiscarders())
defer discardStderr()()
b.ResetTimer()
concurrency := runtime.GOMAXPROCS(0)
var wg sync.WaitGroup
wg.Add(concurrency)
for i := 0; i < concurrency; i++ {
go func() {
for i := 0; i < b.N; i++ {
log(message)
}
wg.Done()
}()
}
wg.Wait()
b.StopTimer()
}
func BenchmarkInfo(b *testing.B) {
benchmarkLog(b, Info)
}
func BenchmarkInfoConcurrent(b *testing.B) {
benchmarkLogConcurrent(b, Info)
}
func BenchmarkWarning(b *testing.B) {
benchmarkLog(b, Warning)
}
func BenchmarkWarningConcurrent(b *testing.B) {
benchmarkLogConcurrent(b, Warning)
}
func BenchmarkError(b *testing.B) {
benchmarkLog(b, Error)
}
func BenchmarkErrorConcurrent(b *testing.B) {
benchmarkLogConcurrent(b, Error)
}
func mixer() func(...any) {
var i int64
return func(args ...any) {
n := atomic.AddInt64(&i, 1)
switch {
case n%10000 == 0:
Error(args...)
case n%1000 == 0:
Warning(args...)
default:
Info(args...)
}
}
}
func BenchmarkMix(b *testing.B) {
benchmarkLog(b, mixer())
}
func BenchmarkMixConcurrent(b *testing.B) {
benchmarkLogConcurrent(b, mixer())
}
func BenchmarkVLogDisabled(b *testing.B) {
benchmarkLog(b, vlog)
}
func BenchmarkVLogDisabledConcurrent(b *testing.B) {
benchmarkLogConcurrent(b, vlog)
}
func BenchmarkVLogModuleFlagSet(b *testing.B) {
defer withVmodule("nonexistant=5")()
benchmarkLog(b, vlog)
}
func BenchmarkVLogModuleFlagSetConcurrent(b *testing.B) {
defer withVmodule("nonexistant=5")()
benchmarkLogConcurrent(b, vlog)
}
func BenchmarkVLogEnabled(b *testing.B) {
defer withVmodule("glog_bench_test=5")()
if got := bool(V(3)); got != true {
b.Fatalf("V(3) == %v, want %v", got, true)
}
benchmarkLog(b, vlog)
}
func BenchmarkVLogEnabledConcurrent(b *testing.B) {
defer withVmodule("glog_bench_test=5")()
benchmarkLogConcurrent(b, vlog)
}
func vlog(args ...any) {
V(3).Info(args)
}
func withVmodule(val string) func() {
if err := flag.Set("vmodule", val); err != nil {
panic(err)
}
return func() { flag.Set("vmodule", "") }
}
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