Good old fashioned userland priority is what so many people seem to forget. nice -10 sorted out many problems with dropouts when moving windows etc. I'm not 100% sure about all systems but for me if you start nice -10 pd <your normal rgs> the pd-gui and watchdog inherit the priority. That's not what you really want. So then doing renice -10 PID on just the running pd is best. But that means looking for the PID after launch. Basicaly - give pd engine and Jack plenty of priority but less tp the GUI.
On Sat, 12 Aug 2006 13:10:47 -0400 "Chuckk Hubbard" badmuthahubbard@gmail.com wrote:
Interesting. I was going to just write this off, but maybe someone can explain it to me: I compiled a real-time kernel, according to http://demudi.agnula.org/wiki/Low-latencyKernelBuildingHowto I run Jack with realtime enabled, and run Pd with realtime enabled, and bring up Pd's test tone. I then click and drag the bar on the Pd test tone window, and move it in circles, and immediately start getting clicks and xruns. It doesn't handle my sequencer too well, either. Every time I ask what needs to be done, I get one step, which takes me a day to complete, and then find out I have to do another step. Is it really possible to have Linux set up so that all audio always gets done before anything else, without exception? It's frustrating that it works better for me in Windows after all these unproductive days.
-Chuckk
On 8/11/06, Michael Berkowski michael@berkowski.net wrote:
Hi all,
It's taken me a bit to narrow this down, and I haven't seen much in the archive related to this specifically, but I wondered if someone could shed some light on this GUI weirdness.
While running Pd with Jack, the GUI redraw when using the mouse is highly erratic. Typically, it will start out fine and I can move a slider or numberbox smoothly, but if I hold onto it for more than a few seconds, the redraw will start to pause and hang behind by increasing intervals. Meanwhile, there aren't any audio dropouts or xruns, just the slow GUI. No CPU spikes, either.
I have found that if I constantly run a metro and a flashing button, the problem goes away since the GUI is forced to redraw at least as often as the metro beats, but I'd like to avoid doing this.
I initially noticed this problem with the planetCCRMA pd and jack rpms (which are older versions, I think). But I have since recompiled Pd, Jack, and tcl/tk from source and the problem persists.
I'm using: 2.6.16-1.2080.13.rdt.rhfc4.ccrmasmp (FC4 jackd -R -d alsa -dhw:0 -r44100 -p2048 -n2 (doesn't seem to matter what jack params are used, RT or not) pd 0.39-2 compiled with alsa and jack support.
I'd be thankful if anyone has an ideas before I try upgrading the kernel as a last resort.
Best, Michael Berkowski
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