Установлена переменная GOMAXPROCS

main.go

@@ -30,6 +30,12 @@ func lstn(connection *net.UDPConn, alarm chan struct{}) {
 }
 
 func main() {
+	envFlag := runtime.GOMAXPROCS(runtime.NumCPU())
+	if envFlag > -1 {
+		fmt.Println("GOMAXPROCS =", runtime.NumCPU())
+	} else {
+		fmt.Println("GOMAXPROCS is default!")
+	}
 	argIP := flag.String("ip", "0.0.0.0", "Listen IP address")
 	argPort := flag.Int("port", 10003, "Listen Port number")
 	flag.Parse()