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


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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@billp.org                  |
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