On Aug 22, 2008, at 6:28 AM, Wojciech Puchar wrote:
tu run (at startup) asterisk PBX as user centrala with realtime priority.
asterisk is started, but without realtime priority.

Yes, you'd be running the su process with realtime priority.  :-)

and su forks shell and asterisk - isn't it?

That's right. RT priority isn't inherited by children processes, or so it seems.

[ ... ]
Well, you have to run rtprio as root, or else make it setuid-root (which probably isn't a great idea). Presumably this thing has a startup script which runs it, and it probably creates a PID file under /var/run which you could use to adjust the priority during system startup via:

rtprio 31 -`cat /var/run/asterix.pid`

did this

/usr/bin/su centrala -c \
"/usr/local/sbin/asterisk -C /centrala/etc/asterisk.conf"
/bin/sleep 5
/usr/sbin/rtprio 31 -`cat /centrala/run/asterisk.pid`

works fine, but looks like workaround for me not proper solution?
am i wrong? thank you for explanation why it doesn't work directly

Very few people do anything with RT priorities, in part because Unix was designed to maximize workload throughput originally in a batch- processing context. People who need hard realtime tend to use more specialized systems and hardware designed for realtime tasks (ie, bounded interrupt service times and the like)...

--
-Chuck

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