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On 15.11.2010 23:06, Raphael Raccuia wrote:
<blockquote cite="mid:4CE1AED7.6080200@blindekinder.com" type="cite">
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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>
it does add latency in most cases. you specify the amount of latency
by using different period sizes and numbers of periods settings. But
you can use very small buffers on some systems with good audio
hardware, so they have the same size you would use inside pd in
standalone (64samples). In this case you will not have more latency
using jack than using pd standalone. (I'm also only 99.9% sure about
this, beware.).<br>
<br>
Practically speaking - on systems I used until now I could always
achieve lower buffer sizes using pd standalone and thus get lower
round trip delays too.<br>
<blockquote cite="mid:4CE1AED7.6080200@blindekinder.com" type="cite">
<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>
</blockquote>
you can run pd with the -rt flag, without jack. fo me it has proven
to be far more stable at the lowest possible latencies than using
jack. but this depends on your setup too. I don't use jack when I
don't need it.<br>
<br>
Martin<br>
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