What is the best logger in Go?

There are many logger implements in Go including built-in log.

Today, we will explore three commonly used loggers in Go projects, as well as the built-in logger.

First, let’s output unstructured logs.

Case 1. unstructured log

Benchmark

The following benchmarking code measures only the performance of writing logs to a buffer. It is designed to check both execution time and memory allocation.

package logger

import (
 "bytes"
 "github.com/rs/zerolog"
 "github.com/sirupsen/logrus"
 "go.uber.org/zap"
 "go.uber.org/zap/zapcore"
 "log"
 "testing"
)

func BenchmarkLogPrintf(b *testing.B) {
 b.ReportAllocs()
 var buf bytes.Buffer
 log.SetOutput(&buf)
 b.ResetTimer()
 for i := 0; i < b.N; i++ {
  log.Printf("This is a benchmark log entry number %d", i)
 }
}

func BenchmarkLogrus(b *testing.B) {
 b.ReportAllocs()
 var buf bytes.Buffer
 logger := logrus.New()
 logger.SetOutput(&buf)
 b.ResetTimer()
 for i := 0; i < b.N; i++ {
  logger.Printf("This is a benchmark log entry number %d", i)
 }
}
func BenchmarkZap(b *testing.B) {
 b.ReportAllocs()
 var buf bytes.Buffer

 encoderConfig := zap.NewProductionEncoderConfig()
 core := zapcore.NewCore(
  zapcore.NewJSONEncoder(encoderConfig),
  zapcore.AddSync(&buf),
  zapcore.InfoLevel,
 )

 logger := zap.New(core)
 b.ResetTimer()
 for i := 0; i < b.N; i++ {
  logger.Sugar().Infof("This is a benchmark log entry number %d", i)
 }
}

func BenchmarkZerolog(b *testing.B) {
 b.ReportAllocs()…