package main

import (
	"fmt"
	"time"
	"bufio"
	"os"
	"runtime/debug"
)

func main() {

	go periodicFree()

	fmt.Println("5 second delay")
	time.Sleep(time.Second * 5)
	fmt.Println("allocating large slice")
	slice := make([]byte, 100000000)

	for i := 0; i < len(slice); i++ {
		slice[i] = 1
	}

	slice = nil

	fmt.Println("Large slice set to nil")
	fmt.Println("Press any key to terminate...")
	reader := bufio.NewReader(os.Stdin)
	reader.ReadString('\n')

	fmt.Println("ending program")
}

func periodicFree() {
	ticker := time.NewTicker(time.Second * 20)
	for _ = range ticker.C {
		fmt.Println("Freeing memory...")
		debug.FreeOSMemory()
	}
}