Re: [LAD] Any package builders here?

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To: <paul@...>, <ralf.mardorf@...>
Cc: <linux-audio-dev@...>
Date: Wednesday, June 1, 2011 - 11:49 am

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I might get flamed for this however GUI should not really be run with rt pr=
iority=2C
that is an honour for the DSP engines. There are some reasonable arguments
however for leaning on the scheduler with renice for the user interfaces to=
give
them a bit of a bias over other system operations. Admittedly a big topic s=
ince
the GUI probably sits on top of the windowing system anyway.

So I have not used renice on graphics/GUI processes but I have worked on=20
systems where the RT DSP code is happily chewing up 75% of CPU to churn=20
out 32 unified synth voices and the GUI response can then give a bad impres=
sion
of an application. Renice will help the sometime intensive graphics manipul=
ation
code (which is surprisingly close to DSP anyway if you are doing subpixel i=
mage
transforms with shadow rendering) to get a little more of the now starved s=
ystem=20
resources.

I don't see any point to advise not giving the audio group access to this o=
ption
since you can argue that=2C whilst it does not do anything very spectacular=
=2C it is not=20
going to damage system integrity any further than the already active RT pri=
ority=20
rights. Low latency audio systems are all about tuning and this remains one=
of
the tools available to you.

Regards=2C cnik.

"we have to make sure the old choice [Windows] doesn't disappear=94.
Jim Wong=2C president of IT products=2C Acer

> Date: Wed=2C 1 Jun 2011 07:27:39 -0400

=

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I might get flamed for this however GUI should not really be run with rt pr=
iority=2Cthat is an honour for the DSP engines. There are some reasonab=
le argumentshowever for leaning on the scheduler with renice for the us=
er interfaces to givethem a bit of a bias over other system operations.=
Admittedly a big topic sincethe GUI probably sits on top of the window=
ing system anyway.So I have not used renice on graphics/GUI process=
es but I have worked on systems where the RT DSP code is happily chewin=
g up 75% of CPU to churn out 32 unified synth voices and the GUI respon=
se can then give a bad impressionof an application. Renice will help th=
e sometime intensive graphics manipulationcode (which is surprisingly c=
lose to DSP anyway if you are doing subpixel imagetransforms with shado=
w rendering) to get a little more of the now starved system resources.<=
br>I don't see any point to advise not giving the audio group access to=
this optionsince you can argue that=2C whilst it does not do anything =
very spectacular=2C it is not going to damage system integrity any furt=
her than the already active RT priority rights. Low latency audio syste=
ms are all about tuning and this remains one ofthe tools available to y=
ou.Regards=2C cnik."we have to make sure the old choice [Wi=
ndows] doesn't disappear=94.Jim Wong=2C president of IT products=2C Ace=
r&gt=3B Date: Wed=2C 1 Jun 2011 07:27:39 -0400&gt=
=3B From: paul@linuxaudiosystems.com&gt=3B To: ralf.mardorf@alice-dsl.n=
et&gt=3B CC: linux-audio-dev@lists.linuxaudio.org&gt=3B Subject: Re=
: [LAD] Any package builders here?&gt=3B &gt=3B On Wed=2C Jun 1=2C =
2011 at 5:50 AM=2C Ralf Mardorf &lt=3Bralf.mardorf@alice-dsl.net&gt=3B wrot=
e:&gt=3B &gt=3B Hi :)&gt=3B &gt=3B&gt=3B &gt=3B could you pleas=
e add a dependency to audio/MIDI app packages for your&gt=3B &gt=3B dis=
tros=2C that will set up real-time usage?&gt=3B &gt=3B&gt=3B &gt=3B=
The following issue is wide spread:&gt=3B &gt=3B&gt=3B &gt=3B &nbs=
p=3B &nbsp=3B &nbsp=3B &nbsp=3B-------- Forwarded Message --------&gt=
=3B &gt=3B &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=3B&gt=3B Be sure you are able t=
o run audio apps with the right&gt=3B &gt=3B &nbsp=3B &nbsp=3B &nbsp=3B=
&nbsp=3Bprivileges=2C eg.&gt=3B &gt=3B &nbsp=3B &nbsp=3B &nbsp=3B &nbs=
p=3B&gt=3B add your user to the "audio" group in /etc/groups and check&=
gt=3B &gt=3B &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=3B&gt=3B out /etc/security/li=
mits.conf for these lines&gt=3B &gt=3B &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=
=3B&gt=3B @audio &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=3B- &nbsp=3B &nb=
sp=3B &nbsp=3B rtprio &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=3B100&g=
t=3B &gt=3B &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=3B&gt=3B @audio &nbsp=3B &nbsp=
=3B &nbsp=3B &nbsp=3B &nbsp=3B- &nbsp=3B &nbsp=3B &nbsp=3B nice &nbsp=3B &n=
bsp=3B &nbsp=3B &nbsp=3B &nbsp=3B &nbsp=3B-10&gt=3B &gt=3B for the =
n-hundreth time: nice has no role to play in improving the&gt=3B perfor=
mance of pro-audio/music creation software.&gt=3B _____________________=
__________________________&gt=3B Linux-audio-dev mailing list&gt=3B=
Linux-audio-dev@lists.linuxaudio.org&gt=3B http://lists.linuxaudio.org=
/listinfo/linux-audio-dev
=

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Messages in current thread:
[LAD] Any package builders here?, Ralf Mardorf, (Wed Jun 1, 9:50 am)
Re: [LAD] Any package builders here?, Fernando Lopez-Lezcano, (Wed Jun 1, 5:14 pm)
Re: [LAD] Any package builders here?, Robin Gareus, (Wed Jun 1, 12:40 pm)
Re: [LAD] Any package builders here?, Ralf Mardorf, (Wed Jun 1, 3:38 pm)
Re: [LAD] Any package builders here?, Paul Davis, (Wed Jun 1, 11:27 am)
Re: [LAD] Any package builders here?, Ralf Mardorf, (Wed Jun 1, 4:10 pm)
Re: [LAD] Any package builders here?, David Robillard, (Wed Jun 1, 4:56 pm)
Re: [LAD] Any package builders here?, Nick Copeland, (Wed Jun 1, 4:38 pm)
Re: [LAD] Any package builders here?, Nick Copeland, (Wed Jun 1, 11:49 am)
Re: [LAD] Any package builders here?, Dominique Michel, (Wed Jun 1, 4:17 pm)
Re: [LAD] Any package builders here?, Ralf Mardorf, (Wed Jun 1, 4:24 pm)
Re: [LAD] Any package builders here?, Paul Davis, (Wed Jun 1, 12:06 pm)
Re: [LAD] Any package builders here?, David Robillard, (Wed Jun 1, 3:06 pm)
Re: [LAD] Any package builders here?, Nick Copeland, (Wed Jun 1, 1:11 pm)