On 09/10/17 19:15, Athanasios Silis wrote: Hi there, I have setup an audio system around jackd based on ubuntu studio (14.04 LTS). I have written various scripts to setup jackd and clients. It is tested and up running. Now I would like to add a cmd in rc.local in order for the whole system to be brought up at boot. I tried #set limits su - nass -c "ulimit -r 95 -l unlimited" 2>&1 | tee -a /tmp/audio.log #verify limits su - nass -c "ulimit -r -l" 2>&1 | tee -a /tmp/audio.log #boot audio stuff su - nass -c "cd /home/nass/audio_setup/scripts ; bash ./cmdaudio start" 2>&1 | tee -a /tmp/audio.log However the ulimit "set" command fails with message ulimit: real-time priority: cannot modify limit: Operation not permitted I read that ulimits are not ready yet at this time. Is there a way to forcefully "bring them up" in order to have them set for the user "nass" before starting the audio scripts ?? Thank you _______________________________________________ Linux-audio-user mailing listLinux-audio-user@lists.linuxaudio.orghttps://lists.linuxaudio.org/listinfo/linux-audio-user ulimit is built-in to the command shell program. I'd suggest you encase your commands in a shell script with the ulimit at the start, and invoke that, via su, from rc.local. However, I suspect that will still reject the request. I'd suggest you look at starting the programs, then use the renice command (see man renice) to alter the priority once they are running. You need to be root to raise the priority of a process above normal. Bill -- +----------------------------------------+ | Bill Purvis | | email: bill(a)billp.org | +----------------------------------------+ _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org https://lists.linuxaudio.org/listinfo/linux-audio-user

I do not know if these things will help, I have run a headless session complete with dbus, pulseaudio, jackdbus and various other audio applications... I really didn't need PA and therefore could have run without the dbus stuff. It was more of an experiment to see what I could do and the headless box had less than 1/4Gb of ram anyway, so it was not practical for real use. I should try setting up a headless jackd box on something newer though where I can make real use of it.