multithread for dictateNode.

aws-experiment-launch/experiment/commander/main.go

@@ -75,6 +75,11 @@ func dictateNodes(command string) {
 		port := "1" + config[1] // the port number of solider is "1" + node port
 		addr := strings.Join([]string{ip, port}, ":")
 
+		go dictateNode(addr, command)
+	}
+}
+
+func dictateNode(addr string, command string) {
 	// creates client
 	conn, err := net.Dial("tcp", addr)
 	if err != nil {
@@ -95,7 +100,6 @@ func dictateNodes(command string) {
 	buff := make([]byte, 1024)
 	n, _ := conn.Read(buff)
 	log.Printf("Receive from %s: %s", addr, buff[:n])
-	}
 }
 
 func hostConfigFile() {