output

135 - heap objects before creating timers
22570169 - heap objects after creating timers
8031998 - heap objects after running GC, before timers expire
163 - heap objects after timers expire

timers.go

package main

import (
	"fmt"
	"runtime"
	"time"
)

func main() {
	var m runtime.MemStats

	runtime.ReadMemStats(&m)
	fmt.Printf("%d - heap objects before creating timers\n", m.HeapObjects)

	createTimers()

	// See how many objects have been created
	runtime.ReadMemStats(&m)
	fmt.Printf("%d - heap objects after creating timers\n", m.HeapObjects)

	// Run GC before timers have expired
	runtime.GC()
	runtime.ReadMemStats(&m)
	fmt.Printf("%d - heap objects after running GC, before timers expire\n", m.HeapObjects)

	// Wait for timers to expire
	time.Sleep(time.Second * 3)

	runtime.GC()
	runtime.ReadMemStats(&m)
	fmt.Printf("%d - heap objects after timers expire\n", m.HeapObjects)
}

func createTimers() {
	for i := 0; i < 10000000; i++ {
		time.NewTimer(time.Second * 2)
	}
}