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Slow rendering - CPU at 85% idle

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Bruce Wittman
Slow rendering - CPU at 85% idle
on May 21, 2013 at 7:59:38 pm

Hello Cowhands,

I am looking for some tech heads who can explain my issue.
FCPX is starting to render very slowly. Urrrrg!
FYI, I edit all my projects on external 1TB Gtech hard drives.

So I have been trying all the usual tricks, to no avail.
Then I looked at the CPU usage while rendering FCPX.

Look at this picture of my Activity Monitor.




I am confused by the fact that the CPU usage 85% idle. All the time it is rendering.
What gives?

Bruce Wittman
Executive Producer

Eagle Video Productions, Inc.
2201 Woodnell Drive
Raleigh, NC 27603-5240

Website: http://www.eaglevideo.com
Email: bruce@eaglevideo.com

pho: 919-779-7891
cel: 919-818-5556


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James Cude
Re: Slow rendering - CPU at 85% idle
on May 21, 2013 at 10:28:44 pm

FCPX uses the GPU to render, not the CPU so that's normal...


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Mark Dobson
Re: Slow rendering - CPU at 85% idle
on May 22, 2013 at 6:29:30 am

[James Cude] "FCPX uses the GPU to render, not the CPU so that's normal..."

And how does the RAM help out?

Is there an efficiency equation between RAM, GPU and CPU?

I fitted out my old 2008 MacPro with 22Gbs of Ram and bought the 5770 graphics card and noticed almost no improvement in performance.

It was only on buying the new 3.4Ghz iMac with 32Gbs of Ram and a NVIDIA GeForce GTX 680MX graphics card that things started to get better, probably as good as they get.

Export time ( Share ) is now phenomenal and complex renders are also a lot faster.

I think its important to not underestimate the complexity of whats actually going on under the hood when one is rendering layered full HD clips and the only way to really speed workflow up would be to work with proxies, something I've yet to try out.


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Bruce Wittman
Re: Slow rendering - CPU at 85% idle
on May 22, 2013 at 12:54:20 pm

So how do I see the GPU efficiency? Can I view it like I did with the CPU? Do I need a better card?

Bruce Wittman
Executive Producer

Eagle Video Productions, Inc.
2201 Woodnell Drive
Raleigh, NC 27603-5240

Website: http://www.eaglevideo.com
Email: bruce@eaglevideo.com

pho: 919-779-7891
cel: 919-818-5556


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James Cude
Re: Slow rendering - CPU at 85% idle
on May 22, 2013 at 11:43:41 pm

What are your system specs?


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Bruce Wittman
Re: Slow rendering - CPU at 85% idle
on May 23, 2013 at 12:42:08 pm

My 17" MacBookPro specs are:

Model Name: MacBook Pro
Model Identifier: MacBookPro8,3
Processor Name: Intel Core i7
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 16 GB
Boot ROM Version: MBP81.0047.B27
SMC Version (system): 1.70f5
Hardware UUID: 9D90DF9A-FFBF-5B3C-81BA-7881CAEA8E92
Sudden Motion Sensor:
State: Enabled

VIDEO CARD
AMD Radeon HD 6770M:
Chipset Model: AMD Radeon HD 6770M
Type: GPU
Bus: PCIe
PCIe Lane Width: x8
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x6740
Revision ID: 0x0000
ROM Revision: 113-C0170L-573
gMux Version: 1.9.24
EFI Driver Version: 01.00.573

I have just upgraded my RAM to 16 GB.
I am curious about upgrading my graphics card
since I was told the GPU is used for rendering, not the CPU RAM.

Thanks for any help and insight.

Bruce Wittman
Executive Producer

Eagle Video Productions, Inc.
2201 Woodnell Drive
Raleigh, NC 27603-5240

Website: http://www.eaglevideo.com
Email: bruce@eaglevideo.com

pho: 919-779-7891
cel: 919-818-5556


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