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Old 11-28-2012, 10:33 AM   #1
sbauer72
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Linux Real Time Embedded


ALL,

Has anyone used Linux as a RTOS? I am looking into some linux based OSes.
QNX - this one looks promising.
ThreadX - I am also looking into this but I have not used it yet.

If I am missing any Linux based RTOS and you know if is very good then please tell me.
 
Old 11-28-2012, 11:00 AM   #2
rstewart
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I used QNX about 15 years ago on a project I was working on. Very deterministic provided you only ran in CLI. I'm sure that they have made advancements since that time so go ahead and give them a try. I was impressed with what they had to offer given hardware horsepower then. :-)
 
Old 11-28-2012, 12:03 PM   #3
sundialsvcs
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You should make sure that what you're looking at is very recent; that it is aware of features in the most-recent Linux kernel versions.

And, beyond that ... bear in mind that Linux is not designed to be a true RTOS. The requirements of an RTOS are highly specialized and generally mutually-exclusive with the needs of the general purpose OS. (Most of the time, an RTOS kernel running one CPU is served by Linux running on another "sister" CPU, because the RTOS's attention is necessarily dominated by hard response-time requirements and minuscule time-slices.)

Last edited by sundialsvcs; 11-28-2012 at 12:04 PM.
 
Old 11-28-2012, 01:25 PM   #4
sbauer72
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ALL,

I have read a long time ago about the Linux Kernel never being able to be "Real Time". I was not sure if any updates have been made. I know that there would have to be specific mods in linux for it to be considered a RTOS.

I heard that QNX has a modified kernel to do so. Has anyone used threadX or RTLinux?

I have used Vxworks and Integrity most of my career.
 
Old 11-28-2012, 09:08 PM   #5
jefro
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The only real time linux that I know of are commercial products. I have been using QNX for almost 20 years but it is slowly fading out. Not because it is bad, I think the upstream vendors have too many windows programmers.

The best free linux is more of a near real time.

What do you need this for? Usually it is an automation or even music/video type need.
 
  


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