Setting priority of audio group apps

[fourfour]

When I run jackd and other apps, they do not run in realtime. The priority is always 20. I can use renice to change the priority, but I can't run things in realtime by default. How do I change this? I'm using Xubuntu and have gone through the standard Ubuntu set up for jack.

[Pablo]

Hi,

Assuming your user already has rtprio privilege, you don't have to do anything else than keeping the default "realtime mode" in qjackctl, afaik.

Maybe you are confused (as I was once) because jackd is "multithread" and you are only seeing the threads which are not realtime. I don't think you have to worry about those.

Cheers, Pablo

[fourfour]

Code: Select all

~$ ps -eLo rtprio,cmd |grep jack
     - /bin/sh /usr/bin/qjackctl
     - /usr/bin/pasuspender -- /usr/lib/qjackctl/qjackctl.real
     - /usr/lib/qjackctl/qjackctl.real
     - /usr/lib/qjackctl/qjackctl.real
     - /usr/lib/qjackctl/qjackctl.real
     - /usr/lib/qjackctl/qjackctl.real
     - /usr/bin/jackd -P1 -p128 -dalsa -r44100 -p256 -n4 -D -Chw:0,0 -Phw:0,0
     - /usr/bin/jackd -P1 -p128 -dalsa -r44100 -p256 -n4 -D -Chw:0,0 -Phw:0,0
     1 /usr/bin/jackd -P1 -p128 -dalsa -r44100 -p256 -n4 -D -Chw:0,0 -Phw:0,0
     - /usr/bin/jackd -P1 -p128 -dalsa -r44100 -p256 -n4 -D -Chw:0,0 -Phw:0,0
     - grep --color=auto jack


Code: Select all

~$ ps -eLo rtprio,cmd |grep yoshimi
     - yoshimi -j -l /home/me/audio/songs/mysong/preset.xmz
     - yoshimi -j -l /home/me/audio/songs/mysong/preset.xmz
     - yoshimi -j -l /home/me/audio/songs/mysong/preset.xmz
     - yoshimi -j -l /home/me/audio/songs/mysong/preset.xmz
     - yoshimi -j -l /home/me/audio/songs/mysong/preset.xmz
     - grep --color=auto yoshimi


By the looks of it, it seems that Jack is running in real time, but Yoshimi is not. Is there some other method I should be using to determine priority?

[Capoeira]

[code]~$ ps -eLo rtprio,cmd |grep jack

By the looks of it, it seems that Jack is running in real time, but Yoshimi is not. Is there some other method I should be using to determine priority?

you can use htop. by default the priority is disabled....enable in "setup"

[slowpick]

look at your .jackdrc file. In jackd1, the -R option enables realtime, if available.

In jackd2, this is reversed, realtime is the default, if available, and the -R option is
only used to turn it off, should the need exist.

Jackd2 is not automatically 'the best'. Linux users must go with the flow
of the hardware they have available, and what software works with it.
Very little is carved in stone.

As I recall, jackd 1.9.7, 1.9.8 and higher, is jackd2, while 0.116, 0.118, 0.121 are jackd1
It's easy to bork things with odd mixes of libjack0 variants, so double check synaptic
details, whenever installing audio software.