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Mildly interesting multiprocessing quirk

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Paul RoperMildly interesting multiprocessing quirk
by on Jan 21, 2011 at 6:03:57 pm


I just performed a render from AE CS5 using multiprocessing (AE used 10 cores), and the resulting movie had 8 good frames, 2 frames with the 'footage missing' color bars on one of the elements (a PSD file), then 8 good frames, the 2 bad ones, 8 good, 2 bad...etc. etc. It was as if 8 cores loaded the PSD file successfully but 2 cores didn't.

Not really a problem - I just re-rendered it with multiprocessing off and it was fine. Just kinda interesting...although would have been a pain if it was a huge, hours-long render! 'Twas only a 3 minute render.

So there you go. That's the highlight of my morning so far. Other than a chocolate chip bagel.

Oh yes, forgot to mention - OpenGL is off.

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Dave LaRondeRe: Mildly interesting multiprocessing quirk
by on Jan 21, 2011 at 6:08:23 pm

I don't think you mentioned how much memory you have, so you might want to see how your current memory & processor allocations square with this:

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA

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Paul RoperRe: Mildly interesting multiprocessing quirk
by on Jan 21, 2011 at 7:18:33 pm

I've got 12GB (it's going to be a much more AE-friendly 32GB very soon), with 0.75 GB per processor.

Thanks for the link to that recommended memory page - I'd seen it before and thought "when I get around to it I'll check that out and run some tests". Well, now's the time!

I'm not going to be using my previous settings - my test render came in at 6m 44sec + 15sec prepping background tasks before the render started. Multiprocessing OFF = 5m 52, but with the recommended settings (and multiprocessing ON) it took just 4min 45secs - a third off!

Most of my projects are kinda similar, so these settings should work for me from now on. Thanks, Dave for prompting me to do this!

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Brian CharlesRe: Mildly interesting multiprocessing quirk
by on Jan 22, 2011 at 12:12:25 am

I've been experimenting with settings on my 12 core with 32 GB. Most Comps render and preview faster when I use multiples of 3 for the number of cores (12, 15, 18 etc) and give After Effects RAM in multiples of 3 GB. Each proc gets 1 gb at the higher settings (wish I had 64 :| )

This may be due to the memory pipeline inherent in the Nehalem processors, 3 channels of memory.

Not sure whether these settings are just voodoo or whether this is fact, however tests on the same comp with a variety of MP settings bear this out for me.

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