[LAU] LinuxSampler higher priority than the audio card or jack?!

Nick Copeland nickycopeland at hotmail.com
Mon Aug 17 04:34:41 EDT 2009


Does your system use PAM limits.conf? Most of the online documentation
suggests a value of 95 for the rtprio setting for the audio group. Having 
this thread get 98 is odd, it implies you have some other setting or are using
some other method. Either way, the process would have had to request this
value itself - nobody could really have done it for him.

The values of 65 probably come from the Jack API however that comes from
linking with the process, it is not something jackd does.

Your ps output does not include the associated uid however if LinuxSampler
were running as root it could quite easily give itself rtprio 98.

regards,

"we have to make sure the old choice [Windows] doesn't disappear”.
Jim Wong, president of IT products, Acer




> From: arnold at arnoldarts.de
> To: linux-audio-user at lists.linuxaudio.org
> Date: Mon, 17 Aug 2009 10:22:59 +0200
> Subject: Re: [LAU] LinuxSampler higher priority than the audio card or jack?!
> 
> On Monday 17 August 2009 10:04:50 Ken Restivo wrote:
> >  LinuxSampler grabs priority 98??!
> >  Most JACK apps start up at 65, as you can see, below the priority of
> > jackd.
> >  IRQ-219 is my audio interface.
> >  How was LinuxSampler able to grab such a ridiculously high priority? Who
> > told it to do that?
> 
> Probably the same way as with jackd (two priorities of 80 and 70 in your 
> dump): One thread is the watchdog to kill the others if they misbehave. Of 
> course this thread should have its priority as high as possible...
> 
> Have fun,
> 
> Arnold

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