Paul Dickin
1
COW Coin
Forum Replies Created
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[Tom Sefton] “A strange move from apple then.”
Hi
Blame it on Intel:
https://images.anandtech.com/reviews/mac/MacPro2013/MPsystemarch_north.png
https://images.anandtech.com/reviews/mac/MacPro2013/MPsystemarch_south.png
Or they could have eliminated the GigE and WiFi… -
Hi
I find it extraordinary – with 30 years hindsight 😉 – that Apple’s 0th Mac anniversary (= birthday) announcement presentation contains NO video at all, except the 1984 Super Bowl ad, and a SLIDESHOW and animated screen grabs !!!!! All recorded on VHS (or 3/4″).I truly hadn’t remembered how the huge expense of video production in 1984 ruled it out for everyone except the extreme elite…. Even Apple could only afford 60 seconds.
https://content.time.com/time/video/player/0,32068,3105676330001_2163928,00.htmlWatch it – much of the time Jobs could have been talking about the new MP…
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[Marcus Moore] “The other place will be the 8-core vs 12-core processor. Unless I see a substantive performance increase application test…”
Hi
Not a test, but this analysis of Intel’s spec sheet is informative over the turbo boost constraints on the 12-core versus 8-core and lower:
https://www.marco.org/2013/11/26/new-mac-pro-cpus -
[Jeremy Garchow] “This is a test. I am going to delete it.
“
Hi
Gone from the thread navigation below each post.
Still there on the main View posts by Newest Posts (Date) list page. -
Hi
Does this reason for only one CPU stand up to scrutiny?Quote:
I suspect the real reason is that Apple still {can’t be bothered|can’t figure out how} to add NUMA (non-uniform memory access) support to OS X. The existing 2-socket Mac Pros have been crippled by the interleaved-mode NUMA. (which, interestingly enough, is even hardcoded in the firmware, so when running OSes that support NUMA on a Mac Pro, you can’t benefit from that support, presumably so the benchmarks don’t shine a bad light on OS X – of course it’s blindingly obvious when compared to a same-spec workstation from HP, Dell, etc.)…with PCIe 3, the controller for the bus is now in the CPU, which means that if you have two GPUs, you’ll start to see GPU affinity problems as well.
I’ve seen this with linux and nvidia cards, with two CPUs we would get a maximum CPU->GPU transfer of around 7-8gigs, take out a CPU and it’d bump up to 10-13.
https://news.ycombinator.com/item?id=5923300Quote:
This gets worse under the i7/newer Xeon architecture as each PCIe card is also associated with a different CPU. So if you have a program on the wrong CPU trying to talk to the GPU, you’ll see diminished performance. One commentator noted an almost 30% speed loss in GPU performance with a dual CPU machine vs. a single CPU machine.
…this might provide some insight on why Apple might be willing to sacrifice dual CPU configurations if it could net them at least better GPU and memory performance.
Apple could have possibly recoded Mach to support a more robust NUMA implementation, but think of the risk that could introduce, and the small number of dual processor Mac users out there. Probably wasn’t worth the stability risk.
https://forums.macrumors.com/showthread.php?t=1601942 -
[Jeremy Garchow] “Where did this quote originate?”
Hi
The link in the last para:
https://forums.creativecow.net/readpost/197/859623 -
Hi
Quote about OS X 10.9:
QTMovieModernizer automatically run by QuickTime Player upon discovery of (over 36) legacy codecs.
Produces a new copy in an AV Foundation-supported format:
H264 + AAC
Apple ProRes 422
Apple ProRes 4444 (for alpha channel).Legacy codecs include:
Animation (“RLE”)
Sorenson Video 3
Motion JPEG A
Motion JPEG B
JPEG 2000
BMP
PNG
TGA
TIFF etc etc -
[Joseph W. Bourke] ” It appears that the Mac Pro “chimney” is passive cooling “
Hi
Big fan on top:
https://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_article_large/public/2013/06/13/mac-pro-11.png -
Hi
Here’s the direct link to the web page summary of the presentation:
https://www.pixarpost.com/2013/06/pixars-speech-at-apple-wwdc.htmlFrom the video:
“You’re going to be wanting to process huge amounts of data on one device (GPU) while you’re displaying it fluidly at 60fps on a second.”Put another way:
You’re going to be wanting to process A on one device while you’re doing B on a second.
Where A = Decoding/compositing/rendering etc etc
and B = Displaying/running fancy GUI animations – scopes etc/playing the timeline/encoding/exporting etc etc
And with the CPU there are three+ devices.
Seems like a whole lot of that goes on in editing or running Motion 😉 -
Hi
Pixar have just announced that the video “Painting the Future” is now on Apple’s dev site:
https://forums.macrumors.com/showpost.php?p=17419555&postcount=47https://developer.apple.com/wwdc/videos/
https://www.pixarpost.com/2013/06/pixar-to-conduct-special-lunchtime.html