ROS is not real-time OS. After reading the architecture of ROS, I am unable to realize why is ROS not real-time? What part of the architecture or what design decision is causing that?


2 Answers 2


Check out this website, http://www.control.com/thread/1026205354 you'll find your answer. The reason I directed you to this website is because ROS is an Operating System to provide Real-Time like operation but not truly. You can also call it as Pseudo-RTOS.

  • $\begingroup$ I am expecting an answer particular to the implementation of ROS. $\endgroup$ Mar 1, 2014 at 3:00
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    $\begingroup$ Implementation as in ? :/ $\endgroup$ Mar 1, 2014 at 3:03
  • $\begingroup$ implementation as in, what particular part of ROS is the cause for it not being RT? $\endgroup$ Mar 2, 2014 at 10:24
  • $\begingroup$ I found that it used TCP for communication and so is not RT $\endgroup$ Mar 2, 2014 at 10:25
  • $\begingroup$ @Tvaṣṭā Thanks for the very informative link. However, is there a chance you can summarise the most salient points from that discussion? This helps prevent link rot and ensures people take the right answer away from this question. $\endgroup$
    – ThomasH
    Mar 4, 2014 at 19:12

ROS isn't even an operating system, it's a framework and it's usually built on top of Ubuntu. First and foremost, it provides a clean way to write several modular programs with inputs and outputs and stitch them together at runtime.

There's no reason you can't run ROS inside a RTOS (however, it was developed on Ubuntu, so it will take effort to get it running on anything else.)


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