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From: Chris Meyer <chris@crishdesign.com>
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Subject: Re: [AE] (OT) An example of a PC version of a Mac Pro with today's tech for AE
Date: Wed, 13 Jun 2012 16:58:22 -0600
In-Reply-To: <list-4746055@media-motion.tv>
To: "After Effects Mail List" <AE-List@media-motion.tv>
References: <list-4746055@media-motion.tv>
Message-Id: <8CDB02AD-43DC-4A5F-9A79-A4167B013522@crishdesign.com>


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You may be seeing individual functions in After Effects take advantage =
of multiple cores, regardless of how many "CPUs" you've assigned for =
background rendering. When I have multiprocessing disabled, I still see =
12 of my cores pop when I do a normal "single CPU" preview.

 - Chris


On Jun 13, 2012, at 3:49 PM, Greg Balint wrote:

> Forgive me for the constant questioning of this statement from the =
product manager, but if I have a 6 core cpu with hyperthreading on, and =
I can choose in the preferences to use 9 cores, and it launches 9 =
separate processes in my OS with 2 Gb of RAM reserved for each. And I =
can see those processes all running when I render, and those 9 "cores" =
that windows or OSX shows are all maxed out at 100% usage, and the =
render shows 9 frames at a time being rendered in chunks, how is AE only =
using the 6 physical cores and not also utilizing the extra cores =
available due to hyperthreading?
>=20
> By the statement made, Wouldn't I see only 6 of them pegged at 100% =
usage, while the other 6 aren't doing anything?
>=20
> ////Greg Balint
> ///Art Director / Motion Graphics Designer
> delRAZOR.com/
>=20
> On Jun 13, 2012, at 4:28 PM, Chris Meyer <chris@crishdesign.com> =
wrote:
>=20
>> I probably have my terminology on hyperthreading vs. multithreading =
wrong, and for that I apologize.
>>=20
>> But this does not change the fact - confirmed by the AE product =
manager, fer crissakes - that when you enable the preference for =
multiprocessor rendering, this specific feature can only really use the =
physical cores, and one should not spend more than needed buying RAM =
strictly to feed virtual cores during multiprocessor rendering, as you =
won't see a gain.=20
>>=20
>> To give an example: With my 12 real + 12 virtual core Mac (which the =
OS reports as being 24 cores), a sweet spot would have been 36 or so GB =
of memory so I could reserve the recommended 3 GB per 10 cores =
(reserving 2 cores and 6 GB of RAM for other functions), rather than =
spending money to install (22 x 3) + 6 =3D 72 GB when it would not be =
taken advantage of for multiproc rendering. (Me, I underspent and only =
put 24 GB in it, riffing on outdated recommended practices that you only =
needed 1.5 or maybe 2 GB per process. I regret that, as I'm not getting =
the multiproc boost I should have. OTOH, running two Quadro 4000 cards =
has been nice, but that's a separate well-tread discussion.)
>>=20
>> Aside from that specific use case, in general more RAM is good (esp. =
for large format work like SV2's, as well as more caching etc.), and =
more cores - both real and virtual - are good to accelerate other parts =
of the program. I never said otherwise.=20
>>=20
>> I understand various people have real empirical data that changing =
certain numbers gave certain results, and I don't dispute that. But =
there's a difference between speculating at how the two may be =
connected, and learning what is actually going on underneath the hood.
>>=20
>> Hey - I'm just trying to share some obscure (and unexpectedly =
controversial!) knowledge to help fellow users spend their money wisely.
>>=20
>> back to work -=20
>> Chris


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<html><head></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">You =
may be seeing individual functions in After Effects take advantage of =
multiple cores, regardless of how many "CPUs" you've assigned for =
background rendering. When I have multiprocessing disabled, I still see =
12 of my cores pop when I do a normal "single CPU" =
preview.<div><br></div><div>&nbsp;- =
Chris</div><div><br><div><br></div><div><br><div><div>On Jun 13, 2012, =
at 3:49 PM, Greg Balint wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><div =
bgcolor=3D"#FFFFFF"><div>Forgive me for the constant questioning of this =
statement from the product manager, but if I have a 6 core cpu with =
hyperthreading on, and I can choose in the preferences to use 9 cores, =
and it launches 9 separate processes in my OS with 2 Gb of RAM reserved =
for each. And I can see those processes all running when I render, and =
those 9 "cores" that windows or OSX shows are all maxed out at 100% =
usage, and the render shows 9 frames at a time being rendered in chunks, =
how is AE only using the 6 physical cores and not also utilizing the =
extra cores available due to hyperthreading?</div><div><br></div><div>By =
the statement made, Wouldn't I see only 6 of them pegged at 100% usage, =
while the other 6 aren't doing anything?<br><br>////Greg =
Balint<div>///Art Director / Motion Graphics Designer</div><div><a =
href=3D"http://delRAZOR.com/">delRAZOR.com/</a></div></div><div><br>On =
Jun 13, 2012, at 4:28 PM, Chris Meyer &lt;<a =
href=3D"mailto:chris@crishdesign.com">chris@crishdesign.com</a>&gt; =
wrote:<br><br></div><div></div><blockquote type=3D"cite"><div>I probably =
have my terminology on hyperthreading vs. multithreading wrong, and for =
that I apologize.<div><br></div><div>But this does not change the fact - =
confirmed by the AE product manager, fer crissakes - that when you =
enable the preference for multiprocessor rendering, this specific =
feature can only really use the physical cores, and one should not spend =
more than needed buying RAM strictly to feed virtual cores during =
multiprocessor rendering, as you won't see a =
gain.&nbsp;</div><div><br></div><div>To give an example: With my 12 real =
+ 12 virtual core Mac (which the OS reports as being 24 cores), a sweet =
spot would have been 36 or so GB of memory so I could reserve the =
recommended 3 GB per 10 cores (reserving 2 cores and 6 GB of RAM for =
other functions), rather than spending money to install (22 x 3) + 6 =3D =
72 GB when it would not be taken advantage of for multiproc rendering. =
(Me, I underspent and only put 24 GB in it, riffing on outdated =
recommended practices that you only needed 1.5 or maybe 2 GB per =
process. I regret that, as I'm not getting the multiproc boost I should =
have. OTOH, running two Quadro 4000 cards has been nice, but that's a =
separate well-tread discussion.)</div><div><br></div><div><i>Aside from =
that specific use case</i>, in general more RAM is good (esp. for large =
format work like SV2's, as well as more caching etc.), and more cores - =
both real and virtual - are good to accelerate other parts of the =
program. I never said otherwise.&nbsp;</div><div><br></div><div>I =
understand various people have real empirical data that changing certain =
numbers gave certain results, and I don't dispute that. But there's a =
difference between speculating at how the two may be connected, and =
learning what is actually going on underneath the =
hood.</div><div><br></div><div>Hey - I'm just trying to share some =
obscure (and unexpectedly controversial!) knowledge to help fellow users =
spend their money wisely.</div><div><br></div><div>back to work =
-&nbsp;</div><div>Chris</div></div></blockquote></div></blockquote></div><=
br></div></div></body></html>=

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