linuxaudio.org

On Sun, Jun 12, 2011 at 8:30 PM, Aaron Krister Johnson

 wrote:
> PianoTeq doesn't configure things when jack is running. It just detects and

quoted text
> 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

would it be so hard to just run that very simple command i asked

about? you have absolutely no guarantee that the parameters presented

by Pianoteq translate directly into ALSA driver parameters, though

they probably do. i gave you a very, very simple way to make sure of

this but we still seem to be arguing about whether to run it or not.
JACK requires context switching out of the program woken by the device

driver (jackd) to the client (pianoteq) and back again. This tends to

expose just any weakness in your system setup that relates to process

scheduling. When an app (pianoteq) deals directly with ALSA, this

context switching is avoided. Its very cheap computationally

(relatively speaking), but it is subject to system-induced snafus.
>> yeah, its in the backlog at present. its functionality overlaps quite

quoted text
>> 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?

well, JACK Session springs to mind. this should be taken up on the

jack mailing list rather than here.

_______________________________________________

Linux-audio-user mailing list

Linux-audio-user@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-user