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Le 15. 11. 10 22:21, Pierre Massat a écrit :
<blockquote
cite="mid:AANLkTi=6KieF5kE4xM2n_5N5VVBqATkbsXOUQMZ40BOJ@mail.gmail.com"
type="cite">Hi,<br>
I have installed Ubuntu 10.04 LTS, plus some ubuntu studio stuff
(the audio packages and the plugins). I also tried the rt-kernel.
It didn't work.<br>
But i am amazed, blown away, baffled, etc. Because the generic
kernel does have some crazy rt capabilities indeed. I guess the
ubuntu studio packages must have created the audio group and jack
must have written the proper things in the limit file, but still,
it works surprisingly well. Jack can run in rt with a latency as
low 4 ms without any xruns, although it crashes.It works just fine
at 5.33 ms. Even pd itself work with an extremely low latency (I'd
say below 7 ms), I'm assuming that's because it was configured to
run in rt during the install. <br>
I don't even know if i need JACK anymore.</blockquote>
jack don't add latency, and it's a powerfull sound server... you can
connect pd to the outputs of your sound device and/or other
sound/midi softwares, then you can save a patchbay to recover your
patch... it's one of the most interesting stuffs on linux.<br>
<br>
<blockquote
cite="mid:AANLkTi=6KieF5kE4xM2n_5N5VVBqATkbsXOUQMZ40BOJ@mail.gmail.com"
type="cite"> Does any of you know how i can measure the actual
latency in Pd?</blockquote>
have a look on jdelay: a simple jack command-line latency-meter.
when you start it, a new client appears in jack: connect it between
pd out and in, connect in and out in a pd patch, you'll get a time
in frame: frame/frequency = t in sec (ex 480 / 48000 = 0.010 = 10
ms). You can connect it between sound device in and out and plug a
jack between out and in, you'll get the real round latency...<br>
you will have to compile it, README explains all...<br>
<blockquote
cite="mid:AANLkTi=6KieF5kE4xM2n_5N5VVBqATkbsXOUQMZ40BOJ@mail.gmail.com"
type="cite"> I couldn't tell by ear which config was faster, Pd
alone or Pd plus JACK. <br>
</blockquote>
maybe I'm wrong, but I thing only jack can provide rt...<br>
cheers,<br>
r<br>
<blockquote
cite="mid:AANLkTi=6KieF5kE4xM2n_5N5VVBqATkbsXOUQMZ40BOJ@mail.gmail.com"
type="cite">Looks like it time to say goodbye to rt-kernels...<br>
<br>
This makes me happy. <br>
<br>
Cheers!<br>
<br>
Pierre<br>
<br>
<div class="gmail_quote">2010/11/15 András Murányi <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:muranyia@gmail.com">muranyia@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
So, running the aforementioned RT kernel, managed to patch the
latest nvidia driver following these general instructions: <a
moz-do-not-send="true"
href="http://ubuntuforums.org/showpost.php?p=9233282&postcount=5"
target="_blank">http://ubuntuforums.org/showpost.php?p=9233282&postcount=5</a><br>
I'm already happy because it's quite some time that i haven't
had the RT kernel!<br>
<br>
As i don't use GEM i cannot tell about it, but Pd got faster.
Almost as fast as the 32-bit Pd was (on 64-bit Ubuntu - Hardy
that time). It means i can almost use my MIDI sequencer patch
without the GUI dropping out. Promising! Now i can dig into
the patch for optimisation possibilities, and at the same
time, keep on bugging the community for speeding up the GUI
:o)<br>
<br>
Do you guys think i shall try it with a current 32-bit Pd to
see if the 64-bit version is really slower...?<br>
<br>
(on a side note to RT kernel experiences: the CPU got hotter
indeed, looks like i'll have to tweak the cooling fans
again...)<br>
<br>
Andras
<div>
<div class="h5"><br>
<br>
<div class="gmail_quote">On Mon, Nov 15, 2010 at 9:27 AM,
cyrille henry <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:ch@chnry.net"
target="_blank">ch@chnry.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt
0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
hello,<br>
195.36.24 is the nvidia driver version i'm using.
mainly because it's the version shiped with ubuntu
10.04.<br>
i don't know what 260 would offer better, but i think
it's not impressive.<br>
most of nvidia upgrade is adding support for new card.<br>
anyway, if you don't use graphics for any important
stuff, then you probably don't care.<br>
<br>
i'll be interested to know your impression if you try
this kernel for pd/Gem.<br>
<br>
Cyrille<br>
<br>
Le 14/11/2010 18:02, András Murányi a écrit :<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt
0pt 0.8ex; border-left: 1px solid rgb(204, 204,
204); padding-left: 1ex;">
<div>
i'm using Ubuntu Lucid with standard kernel
(64-bit), and performance in<br>
Pd hasn't really impressed me lately... and WHOA
i've just found a PPA<br>
with RT kernel (<a moz-do-not-send="true"
href="https://launchpad.net/%7Eabogani/+archive/ppa/"
target="_blank">https://launchpad.net/~abogani/+archive/ppa/</a>),
which i'm<br>
very interested in - it's just that it comes with
older Nvidia drivers<br>
195.36.24 while the latest drivers from Nvidia are
260.19.21. Now does<br>
anyone know if i'll loose anything important with
this older (but<br>
appropriately patched for RT) graphics driver?
(btw i don't use graphics<br>
for anything important...)<br>
<br>
Andras<br>
<br>
On Sun, Nov 14, 2010 at 3:25 PM, cyrille henry
<<a moz-do-not-send="true"
href="mailto:ch@chnry.net" target="_blank">ch@chnry.net</a><br>
</div>
<div>
<mailto:<a moz-do-not-send="true"
href="mailto:ch@chnry.net" target="_blank">ch@chnry.net</a>>>
wrote:<br>
<br>
hello,<br>
<br>
you say that you need a RT kernel : did you
benchmarck the<br>
difference between a RT kernel and a standard
kernel?<br>
<br>
anyway, i'm using ubuntu 10.04 with no
optimisation.<br>
compiling pd/Gem is very fast and easy, so i
don't wait the official<br>
package...<br>
<br>
cyrille<br>
<br>
Le 14/11/2010 13:48, Pierre Massat a écrit :<br>
<br>
Hi all!<br>
<br>
I have realized lately that
Fedora/PlanetCCRMA may not be the<br>
best linux<br>
rt distro out there in terms of updates for
Pd. So I wanted to<br>
conduct a<br>
survey among pd-list members to know who is
using what. It seems<br>
like<br>
Ubuntu Studio is the distro that's most
frequently updated. Too bed<br>
because the last time i tried to install it
on my laptop it<br>
didn't work...<br>
Any advice would be appreciated.<br>
I need a rt kernel, of course...<br>
<br>
Pierre<br>
<br>
<br>
<br>
<br>
<br>
</div>
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<font color="#888888">-- <br>
Muranyi Andras<br>
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