test_channel.go

package main

import (
	"runtime"
	"time"
)

func main() {
	runtime.GOMAXPROCS(runtime.NumCPU())

	var m runtime.MemStats
	c := make(chan int, 10)

	go func() {
		for {
			<-c
		}
	}()

	for i := 0; i < 180; i++ {
		c <- 1

		time.Sleep(time.Second)

		if i%10 == 0 {
			runtime.ReadMemStats(&m)
			println(i, m.HeapSys, m.HeapAlloc, m.HeapIdle)
		}
	}
}

test_channel_select.go

package main

import (
	"runtime"
	"time"
)

func main() {
	runtime.GOMAXPROCS(runtime.NumCPU())

	var m runtime.MemStats
	c := make(chan int, 10)

	go func() {
		for {
			select {
			case <-c:
			case <-time.After(time.Second):
			}
		}
	}()

	for i := 0; i < 180; i++ {
		select {
		case c <- 1:
		case <-time.After(time.Second):
		}

		time.Sleep(time.Second)

		if i%10 == 0 {
			runtime.ReadMemStats(&m)
			println(i, m.HeapSys, m.HeapAlloc, m.HeapIdle)
		}
	}
}