I would actually *expect* the two separate instances of 8 threads apiece to
outperform a single instance using 16, for a couple reasons:
1) Not everything in Nuke is multithreaded. Throwing more threads at some
things won’t get you anywhere, but throwing (effectively) two machines at them
will.
2) There have been test results both from within The Foundry (albeit some time
ago) and from end users reporting performance degradation when trying to get
Nuke to make full use of virtual CPUs. Single-threaded operators
notwithstanding, a performance increase using two 8-thread processes (even
though they’re technically utilizing the virtual cores) could be the result of
letting the OS kernel handle the CPU scheduling for the virtual cores between
the two processes.
-Nathan
From: Randy Little
Sent: Friday, February 03, 2012 4:07 PM
To: Nuke user discussion
Subject: Re: [Nuke-users] Threads
dual quad xeon 8 cores real 8 virtual. (westmers?) running 2 instances with 8
shouldn't be faster then a single 16 especially if you take all the extra
memory and i/o thats happening since its doubled. (this just goes back to that
previous thread where they where asking to change the default threads to
include the virtual cores.
Randy S. Little
http://reel.rslittle.com
http://imdb.com/name/nm2325729/
On Fri, Feb 3, 2012 at 15:54, Nathan Rusch <[email protected]> wrote:
How many physical cores do you have?
-Nathan
From: Randy Little
Sent: Friday, February 03, 2012 3:47 PM
To: Nuke user discussion
Subject: [Nuke-users] Threads
ok after the previous conversation I did some test here. on current gen xeon
MACS. literally I can render 2 of the same comp with interleaved frames
significantly faster then the same comp set to 16 threads. Its not even close.
LIke 30% faster to render 2 instances of nuke on the same comp with 8 threads
vs one version on 16. Are we still having threading issues on the Mac side.
Randy S. Little
http://www.rslittle.com
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