For debugging

debug.go

func dumpGoroutines() {
	buf := make([]byte, 1<<20) // 1 MB buffer
	n := runtime.Stack(buf, true)
	log.Printf("=== goroutine dump ===\n%s\n", buf[:n])
}

func monitorGoroutines() {
	go func() {
		ticker := time.NewTicker(1 * time.Second)
		defer ticker.Stop()

		for range ticker.C {
			n := runtime.NumGoroutine()
			log.Printf("goroutines: %d\n", n)
		}
	}()
}

func dumpHeap() {
	var buf bytes.Buffer
	if err := pprof.Lookup("heap").WriteTo(&buf, 2); err != nil {
		log.Println("cannot dump heap:", err)
		return
	}
	log.Println("=== HEAP PROFILE ===")
	log.Print(buf.String())
}

func dumpBlockProfile() {
	var buf bytes.Buffer
	if err := pprof.Lookup("block").WriteTo(&buf, 2); err != nil {
		log.Printf("cannot write block profile: %v", err)
		return
	}
	log.Printf("=== block profile ===\n%s\n", buf.String())
}