Hi Phil,
just to keep this in people's minds... I have exact same problem described in these emails with my Particle Chamber granular synthesis patch. It has 32 "switch~ed" voices. Using one instance seems to be OK, but two or more leads to exponentially-growing CPU usage that eventually makes PD unresponsive to the GUI (and eventually would probably crash PD if I let it go on...) I guess this could relate to the "isn't the GUI supposed to have lower priority than process?" thread, since this particular problem makes PD a bit unusable for the kind of performances I want to be doing with it. The fact that PD lacks a usable voice-allocation method (i.e. CPU resources can be allocated and de-allocated to a voice, something which switch~ has a bug with, and which Nqpoly~ and so on does not do at all) means that I must start looking into SuperCollider to work with my polyphonic granular synthesis stuff. Sad but true...
d.
Phil Stone wrote:
Hi,
I'm getting a slow-but-steady climbing CPU when running some synthesis patches. I (like the poster below) have sub-modules that can be switch~ed on and off. An archive search turned up the following un-replied post:
Hi all
Okay. I'm stumped.
Recently, I've noticed that my cpu meter has been steadily rising. I
think I may have found the culprit.A while back I thought I'd put a power switch (just a switch~ object)
on my poor-man's granular delay line, as my performance patches are
getting a bit bulky.Try this (if you have the time):
http://www.sideshowmedia.ca/cputest.zip
cputest.pd: (needs expr, but I think that's all)
- turn on audio in pd, but leave the power (p toggle) in "lois"
off. Watch the cpu meter climb (over a period of 5 minutes or so -
the toggle prints the cputime every 10 seconds). On my computer (G4
Powerbook, HCS extended 0.38.4) it starts around 5% and hits 10%
after 5 minutes.
- Do the same with "lois" on. For me, cpu hovers around 13-14%. No
increase.
- Repeat step 1. After 10-15 minutes, cputime is higher than with
"lois" on. Switch "lois" on, and cpu drops. Huh?
I have no idea what's going on, but am I missing something
important? Thanks in advance.cheers dafydd
Does anybody have any insight on this? I don't remember this happening until fairly recently, but don't know if it dates to when I started switch~ing modules. I'm currently running 0.39.2-extended RC1 on a MacBook Pro.
Phil Stone
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