Re: [linux-audio-dev] maximum ports -problem

On Wed, Jul 13, 2005 at 08:39:53 -0400, Brett McCoy wrote:
> Last night I was setting up a session in Ardour. I had three tracks for
> keyboard parts that were from imported audio files, so they did not have
> any input ports set. I wanted to bring in drum parts from Hydrogen, and
> started setting up tracks to correspond with the tracks I was using in
> Hydrogen. I got maybe 3 or 4 tracks set up, with the correct inputs,
> and then suddenly Ardour kept telling me that I was out of jack ports
> and needed to reset jack. What is this? I had used maybe 4 stereo
> ports total. My sound card has 12 in/10 out (but I was wasn't using
> them), and Hydrogen presented 32 stereo tracks via Jack, and I was no
> where near the limit. I looked at my jack settings via qjackctl and it
> was set for 128 ports (assuming this is the same thing).

back of the envelope maths:

soundcard ports are always assigned,
even if theres nothing connected: 22
hydrogen, 32*2: 64
ardour uses something like 4 per mono track,
plus 2 more? 34

so thats getting to 120ish, so you could easily have run out.

> After I restarted jackd (and not making any changes in qjackctl),
> Hydrogen refused to start (it would segfault on startup, but if I
> started Hydrogen without jackd it would startup fine), and when I
> reopened the same session in Ardour, the entire screen would freeze
> (except the mouse).

Thats not good, and I dont know why its doing tht offhand, it could be
because theres some stale files or pipes in your jack tmp directory?

strace-ing or gdb-ing hydrogen might give a clue.

- Steve
Received on Wed Jul 13 20:15:05 2005