import (
	"runtime"
	"time"
)

...

	go func() {
		for {
			var m runtime.MemStats
			runtime.ReadMemStats(&m)
			log.Printf("\nAlloc = %v\nTotalAlloc = %v\nSys = %v\nNumGC = %v\n\n", m.Alloc / 1024, m.TotalAlloc / 1024, m.Sys / 1024, m.NumGC)
			time.Sleep(5 * time.Second)
		}
	}()