rtprio + su - doesn't work
cswiger at mac.com
Fri Aug 22 17:04:06 UTC 2008
On Aug 22, 2008, at 6:28 AM, Wojciech Puchar wrote:
>>> tu run (at startup) asterisk PBX as user centrala with realtime
>>> 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)...
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