On Monday 19 November 2007, David Causse wrote: > Ken Restivo a écrit : > > I'm having a bit of difficulty getting chrt to, um, chrt. > > > > I've written a little MIDI-processing daemon and I want it to run with > > high priority. It is very small and tight and I don't expect it to take > > up much CPU, but I definitely want it running first. > > > > So I do this: > > sudo /usr/bin/chrt -f -p 81 `pidof mydaemon` > > > > And then I do this: > > ps -Leo pid,class,rtprio,ni,pri,pcpu,stat,comm --sort -rtprio > > > > And... my daemon does *not* show up in the process list at all. > > Try this : > ps Haxo pid,class,rtprio,ni,pri,pcpu,stat,comm --sort=-rtprio > --sort seems to skip some processes with the -edf syntax style, I don't > know why... > But your process won't be on top because you have set the SCHED_FIFO > wich is not rtprio. > You should use : > chrt -p 81 `pidof mydaemon` > SCHED_RT is the default. hum? SCHED_FIFO is one of the posix realtime scheduling classes. the -f option to chrt chooses this scheduling class. SCHED_RT has different semantics (though also being a reatime scheduling class). Which one you want depends on your needs. For most audio stuff SCHED_FIFO is appropriate.. So chrt -f -p 81 will make your process the top priority in the system given there's no higher one [doh!] ;) Regards, Flo -- Palimm Palimm! http://tapas.affenbande.org _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
