sync.Pool Benchmark test

poolBench_test.go

// go test -bench=.

package main

import (
    "sync"
    "testing"
)

type Person struct {
	Age int
}

var personPool = sync.Pool{
	New: func() interface{} { return new(Person) },
}

func BenchmarkWithoutPool(b *testing.B) {
	var p *Person
	b.ReportAllocs()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		for j := 0; j < 10000; j++ {
			p = new(Person)
			p.Age = 23
		}
	}
}

func BenchmarkWithPool(b *testing.B) {
	var p *Person
	b.ReportAllocs()
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		for j := 0; j < 10000; j++ {
			p = personPool.Get().(*Person)
			p.Age = 23
			personPool.Put(p)
		}
	}
}