Re: [Jack-Devel] jack 1.9.8 + many many connections = problems?

On Tue, Dec 27, 2011 at 06:03:23PM -0800, Fernando Lopez-Lezcano wrote:

> It would seem that something bad is happening when all ports are being  
> connected and the end result is that inside jack some of the soundcard  
> ports seem to go nowhere.
>
> The aj-snapshot process that connects everything takes a bit to run and  
> as it progresses jack reports more and more xruns until it finishes. It  
> would seem that something is running inside jack when ports are  
> connected that is proportional to the number of existing connections  
> (the graph reordering?, that would make sense - but it should not  
> generate xruns, right?).
>
> It also appears to be that if I minimize the number of ports I'm  
> connecting the problem goes away (but then of course the system is not  
> completely functional :-).
>
> Clues?
> Ways to debug?

The complexity of the graph doesn't directly depend on the number
of ports - all that matters is if app A is driving app B or not.
The algorithms used to manage the graph should take advantage
of that, but I don't know if they do. Anyway I'd suspect the 
problem to be with individual port/conncection management.

Suggestions:

- If you have any apps using port/connection callbacks, remove
  these.

- Patch aj-snapshot so it delivers a fixed number of requests
  per unit time instead of running as-fast-as-possible.

Ciao,

-- 
FA

Vor uns liegt ein weites Tal, die Sonne scheint - ein Glitzerstrahl.

1325071615.20554_0.ltw:2,a <20111228112644.GA9063 at linuxaudio dot org>