[LAU] changing ulimit from rc.local in order to start audio scripts from there

Paul Davis paul at linuxaudiosystems.com
Mon Oct 9 22:00:07 UTC 2017


renice has nothing to do with realtime scheduling and is of no use or
importance in tuning scheduling of realtime applications.

On Mon, Oct 9, 2017 at 4:09 PM, Bill Purvis <bill at billp.org> wrote:

> 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 at 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 at billp.org                  |
> +----------------------------------------+
>
>
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>
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