12 Dec
2010
12 Dec
'10
3:10 p.m.
Greetings,
Trying to hammer down the current recommendations for the limits.conf
file. Ardour advises that 'memlock unlimited' is a bad idea, but what's
the formula for setting that value ?
Also, is the 'nice' line still needed ? If so, is there an optimal value ?
TIA,
dp
12 Dec
12 Dec
3:20 p.m.
Dave Phillips a écrit :
Greetings,
Trying to hammer down the current recommendations for the limits.conf
file. Ardour advises that 'memlock unlimited' is a bad idea, but
what's the formula for setting that value ?
Also, is the 'nice' line still needed ? If so, is there an optimal
value ?
TIA,
dp
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Hi Dave,
Do you faced a problem with unlimited memory ?
In Qjackctl it sometimes recommend to set memory to 3/4 of RAM, but I
never listen to that and everything almost cool here !
HTH,
Fred
3:37 p.m.
fred wrote:
Do you faced a problem with unlimited memory ?
In Qjackctl it sometimes recommend to set memory to 3/4 of RAM, but I
never listen to that and everything almost cool here !
I'm not experiencing any problems, I just wondered what to advise other
users. Ardour warns me about the memlock setting, but it performs
without problems. Am I just lucky or is there a disaster waiting to
happen because I have the wrong setting ?
Best,
dp
4:11 p.m.
On Sunday 12 December 2010 16:37:04 Dave Phillips wrote:
fred wrote:
Unlimited locked memory has the problem that one process can lock all your
available ram. Which in itself will almost kill your system as everything has
to be swapped out. And adding more swap will not help then to get your system
back as all ram-memory is locked in place. Instant doom.
Distributions seem to add unlimited memory-lock as default but I think that is
only because they don't know your memory. Would be fun if they created the
limit to 1/2 or 3/4 at installation time.
Have fun,
Arnold
Do you faced a problem with unlimited memory ?
In Qjackctl it sometimes recommend to set memory to 3/4 of RAM, but I
never listen to that and everything almost cool here !
I'm not experiencing any problems, I just wondered what to advise other
users. Ardour warns me about the memlock setting, but it performs
without problems. Am I just lucky or is there a disaster waiting to
happen because I have the wrong setting ? 
13 Dec
13 Dec
2:49 a.m.
The current "official" position is at
http://jackaudio.org/linux_rt_config
and it would be really helpful if other replies to similar questions
in the future just point people there.
It is also true that (oddly) JACK and Ardour do not see eye-to-eye on
the correct setting for memlock. I will rectify that in the next
release of one of them. Its also true that Ardour's message only kicks
in if you memlock less than 75% of your physical RAM, which it uses a
very vague heuristic for a "reasonable setting".
To expand (again) on something mentioned on that FAQ page and earlier
in thread and in other threads: nice(1) is not just "no longer
necessary", it was NEVER necessary, NEVER had anything to with proper
scheduling of realtime threads, and should NEVER be discussed in
connection with JACK and its clients. It is very unfortunate that the
myth that nice is somehow related to all this stuff has propagated so
far and wide - the myth is false, was always false and will always be
false. Please do not mention nice to people in connection with audio
application scheduling and please correct other people when they do.
Its unfortunate that even people like Linus Torvalds fall into this
bad habit, although he will at least admit the mistake when pushed.
3:27 a.m.
On Sun, Dec 12, 2010 at 6:49 PM, Paul Davis <paul(a)linuxaudiosystems.com> wrote:
<SNIP> Its also true that Ardour's message only kicks
in if you memlock less than 75% of your physical RAM,
which it uses a
very vague heuristic for a "reasonable setting".
Humm... 18GB? I must check that one of these days... ;-)
- Mark
3:47 a.m.
On Sun, Dec 12, 2010 at 10:27 PM, Mark Knecht <markknecht(a)gmail.com> wrote:
On Sun, Dec 12, 2010 at 6:49 PM, Paul Davis
<paul(a)linuxaudiosystems.com> wrote:
<SNIP> Its also true that Ardour's message only kicks
just to be clear, i meant to say "
if your limits.conf configuration specifies less than 75% of physical RAM
not
if ardour memlocks ....
--p
in if you memlock less than 75% of your physical
RAM, which it uses a
very vague heuristic for a "reasonable setting".
Humm... 18GB? I must check that one of these days... ;-) 
12 Dec
12 Dec
3:25 p.m.
On Sun, 12 Dec 2010 10:10:29 -0500
Dave Phillips <dlphillips(a)woh.rr.com> wrote:
Greetings,
Trying to hammer down the current recommendations for the limits.conf
file. Ardour advises that 'memlock unlimited' is a bad idea, but what's
the formula for setting that value ?
Also, is the 'nice' line still needed ? If so, is there an optimal value ?
TIA,
dp
My understanding is that Nice has been unnecessary for some time. Also, a lot
of distros are moving away from the use of limits.conf - don't know what they
use instead, just that my latest (squeeze) install asked me if I wanted it to
set up audio when I installed qjackctl and a lot of other audio stuff. I said
yes, and it did everything for me!
--
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.
3:31 p.m.
I think that would make sense that jack's installation automatically
changes limits.conf to whatever they already recommend, wouldn't it? I
think ubuntu package is doing something like this.
2010/12/12 Folderol <folderol(a)ukfsn.org>rg>:
On Sun, 12 Dec 2010 10:10:29 -0500
Dave Phillips <dlphillips(a)woh.rr.com> wrote:
Greetings,
Trying to hammer down the current recommendations for the limits.conf
file. Ardour advises that 'memlock unlimited' is a bad idea, but what's
the formula for setting that value ?
Also, is the 'nice' line still needed ? If so, is there an optimal value ?
TIA,
dp
My understanding is that Nice has been unnecessary for some time. Also, a lot
of distros are moving away from the use of limits.conf - don't know what they
use instead, just that my latest (squeeze) install asked me if I wanted it to
set up audio when I installed qjackctl and a lot of other audio stuff. I said
yes, and it did everything for me!
--
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
3:41 p.m.
On 12/12/2010 04:31 PM, Bernardo Barros wrote:
I think that would make sense that jack's
installation automatically
changes limits.conf to whatever they already recommend, wouldn't it? I
think ubuntu package is doing something like this.
Those settings are in /etc/security/limits.d/audio.conf in recent
Debian-like distro's.
Nice setting:
http://lists.linuxaudio.org/pipermail/linux-audio-user/2010-March/067902.ht…
Iirc Paul Davis mailed a while ago that setting memlock to unlimited is
ok regarding Ardour and that is indeed kinda weird Jack complains about
it. Can't find that mail back that fast.
Best,
Jeremy
3:38 p.m.
Am 12.12.2010 16:25, schrieb Folderol:
My understanding is that Nice has been unnecessary for
some time. Also, a lot
of distros are moving away from the use of limits.conf - don't know what they
use instead, just that my latest (squeeze) install asked me if I wanted it to
set up audio when I installed qjackctl and a lot of other audio stuff. I said
yes, and it did everything for me!
Hi, my debian sid uses /etc/security/limits.d/*.conf files, e.g. audio.conf:
# Provided by the jackd package.
#
# Changes to this file will be preserved.
#
# If you want to enable/disable realtime permissions, run
#
# dpkg-reconfigure -p high jackd
@audio - rtprio 95
@audio - memlock unlimited
#@audio - nice -19
Ciao, Martin
3:39 p.m.
Folderol wrote:
My understanding is that Nice has been unnecessary for
some time. Also, a lot
of distros are moving away from the use of limits.conf - don't know what they
use instead, just that my latest (squeeze) install asked me if I wanted it to
set up audio when I installed qjackctl and a lot of other audio stuff. I said
yes, and it did everything for me!
Hi Will,
Interesting. Things are getting easier. I prepared a fresh install of
Ubuntu 10.04 for audio in only a few minutes, everything works fine.
Best,
dp
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days inactive
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11 comments
9 participants
participants (9)
-
Arnold Krille -
Bernardo Barros -
Dave Phillips -
Folderol -
fred -
Jeremy Jongepier -
Mark Knecht -
Martin Homuth-Rosemann -
Paul Davis