[PD] Jack, Pd-extended, Lucid and me.

[Pedro Lopes]

I was on the train so I had to kill some time :)

I tried running jack with buffer size 4k and it worked a lot better, using
H4 usb audio. Just one instance dropped jack percentage from ~15%to 1/2 %.

It stopped giving A/D/A sync errors in pd console too. But when I fire the
second instance... the CPU just bursts to load the patch and once it run
with a lot of buffer glitches and another time it didn't even load and jack
got so slow that was zombified.

Weird thing is a lot of times, the second instance dies, and jack
survives... thus could imply that pd is actually crashing for some odd
reason. I should try this in my other Linux too, to see if I can get any
meaningful information - so far all I did was blab, sorry.

best of luck with this,
Pedro

p.s: I never got this behaviour with any other pd file, should be
interesting to see what others on this list report using your patch. I
usually never fire 4 pd instances, but sometimes I use two, on windows I had
a stupid habit of using zillions (like 5 or more) instances of pd because I
double clicked a file and he always opened a new instance for that =P But
never had any trouble.


On Wed, Jul 7, 2010 at 1:33 PM, Pedro Lopes <pedro.lopes at ist.utl.pt> wrote:

> Hi Olivier,
>
> I dont have much time on my hands now, but I tested your patch in my Ubuntu
> 9.10 using jack. results:
>
> 1) I lauched the first one, it took quite a while and CPU bursted as soon
> as the patch opened (meaning.. heavy patch :D)
> 1.1) I draw and played a sequence, audio is okay.
> 2) I launched the second. Major CPU burst, that pdextended went almost to
> 90% cpu all the time
> 2.1) The audio began to glitch. (but no xruns on jack)
> 3) I launched a pdextended just to play test audio sinewave, it launched
> fairly quick (of course the CPU was busy with other instances..so not as
> quick as usual) and played without glitch.
>
> I need to test more with more time on my hands, but it seems that its more
> related to how heavy the script is rather than the jack setup. But i really
> need to test it further, and change jack latency to see if it affects that
> much... jack never went past 10% os usage, which is normal for that many
> instances (sometimes i use pd and renoise, and it goes much higher).
>
> My jack setup was:
> - rt (I have rt kernel)
> - buffer at 512 and 3 period
> - using the onboard sound card which is sh*t
> - my laptop is also sh*t for nowadays standards (AMD 1.9 Turion X2)
>
> Best regards,
> Pedro
>
>
>
> On Wed, Jul 7, 2010 at 1:14 AM, Olivier Baudu <lamouraupeuple at gmail.com>wrote:
>
>> Hi.
>>
>> I'm going to try to expose the problems I've met during the last two month
>> dealing with the title of my post.
>> Sorry if it's confused.
>>
>> This winter, I used to work on an Ubuntu Hardy, Extended 0.41.4 and with
>> the jackd and qjackctl from the official repository (by the way, my sound
>> card is a firewire Presonus Firepod).
>> I had no problem to use 4 different instances of Pd at the same time using
>> jackd as sound server. (and I can precise I didn't need RT-kernel to do what
>> I wanted).
>>
>> I recently change for Ubuntu Lucid.
>> So I also change for Pd 0.42.5 (rc4) and the new official jackd and
>> qjackctl.
>>
>> If I use the kernel 2.6.32-23, I can play my patch on one instance, it's
>> stable but the sound crunch a little bit sometimes.
>> I also can execute my patch on 4 instances, but the sound is awful and 3
>> minutes later, Jack quit.
>>
>> So I've try the 2.6.31-11-rt.
>> In Pd-ext, If I change directly from ALSA to Jack, pd quit. Every time I
>> have to change to OSS before to choice Jack and I can't save the jack
>> configuration.
>> On one instance the sound is perfect and stable.
>> It's possible to launch 4 instances without patch and to hear
>> simultaneously the 4 tests tones on my sound card using jack.
>> But it's impossible to launch even 2 instances with my patch.
>> Both quit at the same time when I try to pass from OSS to Jack on the
>> second.
>> Console message just tell me that GUI of Pd have quited.
>>
>> My patch is the one you can find on this page :
>> http://yamatierea.org/papatchs/squareroom/OSR.htm
>> Direct link for the patch :
>> http://yamatierea.org/papatchs/squareroom/OSR.zip
>> But be careful if you look inside... it's still a little bit fuzzy...
>>
>> Do you think there is a way to solve my problem ?
>> --> Using my patch, simultaneously on 4 instances of Pd-extended using
>> Jack on Ubuntu 10.04?
>>
>> Thank you.
>>
>> 01ivier
>>
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>>
>
>
> --
> Pedro Lopes
> contacto: jazz at radiozero.pt
> website: http://web.ist.utl.pt/Pedro.Lopes
>



-- 
Pedro Lopes
contacto: jazz at radiozero.pt
website: http://web.ist.utl.pt/Pedro.Lopes
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