Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 18 Nov 2005 09:22:59 -0600

Ralph Lange wrote:

wasn't it that you had to be running the soft IOC as root on Linux to

see the OS priorities?

Right, although even this may not be sufficient - running an IOC as root

on my 2.4.20-19.9 UP kernel doesn't give me non-zero values for OSSPRI.

 Jeff has an SMP machine and if he runs as root he might be Ok, but I

don't have sudo priviledge on the only SMP machine I have access to.

Marty and Shifu have been developing this on newer kernels for which the

results are probably different, and it also works on Solaris without root.

Jeff Hill also replied:

Know that now, but I *am* still amazed that one can't get prioritized
scheduling of threads (at a lower priority) on Linux as a non privileged
user (this is allowed on windows for example).

It's possible that you can if you have a more recent kernel - IIRC we're

both running 2.4.2x versions, when the latest is something like 2.6.14

and has significantly different real-time functionality.

- Andrew
--
* * Matt Santos / / Leo McGarry * * For a Brighter America * *

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System