[LAU] Jack vs. Alsa, PianoTeq demo: Alsa wins!

[Aaron Krister Johnson]

On Sun, Jun 12, 2011 at 3:23 PM, Paul Davis <paul at linuxaudiosystems.com>wrote:

> On Sun, Jun 12, 2011 at 12:48 PM, Aaron Krister Johnson
> <aaron at akjmusic.com> wrote:
> > Hi Paul-
> > I'm not sure if what you're saying matters, since the buffer settings,
> etc.
> > were the same between jack and alsa settings in the PianoTeq setup
> > dialogs....unless I'm missing something, the /proc directory info you are
> > asking me to compare with jackd settings verify that they were the same.
>
> oops, i somehow missed this in the thread. the settings cannot be the
> same because PianoTeq doesn't control the JACK settings. just run the
> command i mentioned and that will let you see how ALSA gets configured
> by PT and then we can compare it with the way JACK does it.
>
>
PianoTeq doesn't configure things when jack is running. It just detects and
runs with what jack's setting are. However, the *user* configures things
when Alsa is running. Things like sr, buffer sizes, and periods. I was
comparing apples to apples when I announced my results: for instance, if I
set PT to run Alsa @ 256 samples and 2 buffers per period, I also ran jackd
with those setting before starting PT.

I'd love your insight into what could have been going on; things seem quite
a bit better with jack2 (jackdmp-1.9.7) on my system---and, like I said, all
of a sudden weird MIDI stuff that was happening in fluidsynth is now solved,
too....I think the fluidsynth thing was actually related to a new codebase
in FS since 1.1.2 where they merged the scheduling of MIDI and audio being
handled by the same thread, IIRC...could be that the way jack1 in the
version I was running was structured caused some unforeseen voodoo.


> P.S. Did you get my email ever about jackctl.py? Not the one in the jack
> > source tree, but my CL utility of the same name that I wrote?
>
> yeah, its in the backlog at present. its functionality overlaps quite
> a lot of other stuff.
>


Hmmm....like what, Qjackctl? That's a GUI, this is CL. And the CL tools that
currently come with jack do the trick, but with needless typing and lack of
ease---that's what my-front end solves. What other CL tools for making jack
connections in an *easy* way are there?

AKJ

-- 
Aaron Krister Johnson
http://www.akjmusic.com
http://www.untwelve.org
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