The problem might just be due to the way you invoke the processes. Python will by default perform output buffering. You might want to try forcing unbuffered output by e.g. setting the environment variable [PYTHONUNBUFFERED](https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUNBUFFERED). --- [Visit Topic](https://discourse.ros.org/t/ros2-launch-not-interleaving-stdout/2721/2) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: