Golang buffered channel vs blocking channel performance

channel_test.go

/*
BenchmarkBufferedChannel-4   	    5000	    267997 ns/op
BenchmarkBlockingChannel-4   	    3000	    388019 ns/op
*/
package performance_test

import (
	"math/rand"
	"testing"
)

const (
	size = 1024
)

var (
	values []int
)

func init() {
	values = make([]int, size)
	for i := range values {
		values[i] = rand.Int()
	}
}

func bufferedChannel() {
	intChannel := make(chan int, size)

	for i := 0; i < size; i++ {
		go func(j int) {
			intChannel <- values[j]
		}(i)
	}

	for k := 0; k < size; k++ {
		_ = <-intChannel
	}
}

func blockingChannel() {
	intChannel := make(chan int)

	for i := 0; i < size; i++ {
		go func(j int) {
			intChannel <- values[j]
		}(i)
	}

	for k := 0; k < size; k++ {
		_ = <-intChannel
	}
}

func BenchmarkBufferedChannel(b *testing.B) {
	for n := 0; n < b.N; n++ {
		bufferedChannel()
	}
}

func BenchmarkBlockingChannel(b *testing.B) {
	for n := 0; n < b.N; n++ {
		blockingChannel()
	}
}