[PD] Performance Drop at 35 simultaneous [tabplay~]

[Dan Wilken]

The project aim is to play back the loops of different length, so 
mixing down channels doesn't work.

Sample 1 ===|===|===|===|===|===|===|===|===|===|
Sample 2 ====|====|====|====|====|====|====|====|
Sample 3 =====|=====|=====|=====|=====|=====|

This is why we've gone with PD, it seems to me the only recorder that 
can reasonably handle this. I hadn't found VASP though, will see what 
it does.

-Dan

On Saturday, January 10, 2004, at 06:36  PM, Josh Steiner wrote:

> so if i understand correctly, you are recording successive loops of 
> sound and then playing them back all together?  if so, you might 
> consider using VASP or something similar.  so instead of having 200 
> separate arrays, record the new sound into one array, then copy/mix 
> the new sound with the exisitng sound pool array, and then have one 
> tabread playing from that new array.  if that makes any sense :)
>
> http://www.parasitaere-kapazitaeten.net/Pd/ext/vasp/
>
> good luck,
>
> -josh
>


> Dan Wilken wrote:
>
>> List,
>>
>> I have a patch, it records an event into an array event(x), when 
>> recording is stopped, it crops the array to the recorded sample size 
>> and starts a playback [tabplay~ event(x)] -- [bang] [tabplay~] loop.
>>
>> Then we record the second event, until track 200 or so.
>>
>> I was expecting to have to use 2 or three machines, but on my G4 350 
>> I'm starting to have hickups around 35 tracks in. It performs up to 
>> 90 tracks, my current beta, but not well.
>>
>> How can I improve things. I've used tabplay~ because it's supposed to 
>> be cheaper than tabplay4~, correct?
>>
>> Can (and should) both my recording and playback be down-sampled from 
>> default 44.1?
>>
>> Is there any way to change the 32 bit floating point in PD to 16 bit? 
>> Would this help?
>>
>> I used renice to bump pd up to level -19 and Wish to level -17, I 
>> think that helped a bit.
>> Does tabplay have an invisible trigger?
>>
>> I haven't tried no gui yet, will do so next. Will it help?
>>
>> Any ways to allocate more memory? Where does PD store my arrays? RAM 
>> or Hard Drive. The patch currently does not do any writing to or 
>> reading from disk, though I imagine it may have to, especially for 
>> crash recovery and/or network load sharing.
>>
>> Tips for both Linux and OS X Welcome.
>>
>> Is there a good "optimize system for PD" howto out there?
>>
>> Is Panther working better with 0.37 than Jaguar? I'm running Jaguar, 
>> though happy to switch if it's encouraged.
>>
>>
>> A little off topic, but
>> At random points, I get 90 "~error: tabplay~: event0: no such array"s
>>
>> The arrays don't exist, at least not called event0. The arrays are 
>> created at setup time to reduce load during performance, but the 
>> [tabplay~]s are renamed only when triggered. There is nothing that I 
>> can see that's triggering these [tabplay~]s, they're all hidden 
>> behind a [route] and by definition only fire off one at a time, and 
>> named at that point.  Does tabplay have an invisible trigger? This 
>> must be costing me CPU time.
>>
>> This happens whenever I close a subpatch, every time I start and stop 
>> the tabwrite~.
>>
>> Thanks in advance,
>>
>> Dan
>>
>>
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