Date: Fri, 22 Aug 2008 10:03:57 -0700 From: Chuck Swiger <cswiger@mac.com> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-questions@freebsd.org Subject: Re: rtprio + su - doesn't work Message-ID: <69AD26A6-BFB2-4502-AFA8-CA9D9DE7EE59@mac.com> In-Reply-To: <20080822152455.D35191@wojtek.tensor.gdynia.pl> References: <20080821230022.W3189@wojtek.tensor.gdynia.pl> <7C5EDEE9-0577-45D1-9982-3850AC1A1E12@mac.com> <20080822152455.D35191@wojtek.tensor.gdynia.pl>
next in thread | previous in thread | raw e-mail | index | archive | help
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?69AD26A6-BFB2-4502-AFA8-CA9D9DE7EE59>