Re: Realtime OS needed
On Tue, Apr 08, 2003 at 11:57:09AM +0200, martin f krafft wrote:
> Folks,
>
> We are building a robot, and have been advised to use QNX
> (www.qnx.com) for that. QNX is a real-time OS that claims POSIX
> compliance. All nice and well, but I want APT and my familiar Linux
> environment.
>
> I know that there are realtime patches for Linux floating around. So
> I am wondering if any of you have had experience with any of those
> patches. Are they reliable and usable, and do they allow my
> controllers to run in real-time while I can still maintain the box
> with my Debian knowledge?
>
> Lastly: does anyone have a good document covering realtime, what
> it's needs are, and what it does? I know that realtime means that
> processes don't get put in a queue but run immediately. How that
> works with a multi-tasking OS is a bit foggy to me. Moreover, what's
> the difference between a process on a realtime OS, and one with
> nice -20?
I don't know much about it, but AFAIK the realtime patches basically
implement a new scheduler that sits under the kernel, and the realtime
processes run beside the kernel.
There is some info at
http://www.realtime-info.be/encyc/rtlinux/RealtimeLinux.htm
with links to both competing implementations (rtlinux and rtai)
http://www.rtlinux.org seems to be unreachable, but http://www.rtlinux.com
is live.
Note that I have never used either of them. My knowledge comes mostly
from flamewars on LKML.
Frank
>
> Thanks!
>
> --
> Please do not CC me when replying to lists; I read them!
>
> .''`. martin f. krafft <madduck@debian.org>
> : :' : proud Debian developer, admin, and user
> `. `'`
> `- Debian - when you have better things to do than fixing a system
>
> Keyserver problems? http://keyserver.kjsl.com/~jharris/keyserver.html
> Get my key here: http://madduck.net/me/gpg/publickey
Reply to: