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Mercury playback question
I’m running PP CS5 (v5.0.2) on Win7 x64 on an i7-970 (6 cores) with an Nvidia Quadro 4000 (Mercury Playback certified). I have Mercury Playback Engine GPU Acceleration selected in Project/Project Settings/General. When I preview the timeline via Sequence/Render the Entire Work Area, all 6 cores (12 w/ hyperthreading) approach 70% utilization. This is better than the 100% I get if I turn off GPU Acceleration, but I thought it would be less than 10% based on an Adobe video I saw of an A/B test (with and without GPU acceleration). I don’t know what card they were using, but mine has 256 GPUs and, supposedly, PP only uses 100 at the moment, so any more shouldn’t matter. Was I duped? Is there something else I’m supposed to do to get MPE to strut its stuff? Thanks.
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3 Replies
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> supposedly, PP only uses 100 at the moment
Where did you get that information? It’s false. Premiere Pro CS5 can use more than 100 CUDA cores.
To your general question:
CUDA acceleration and CPU usage vary _greatly_ depending on the footage, the effects, the blending modes, scaling, and many other factors. You won’t see the GPU maxed out in all cases, and you will still see lots of CPU utilization in some cases. Unless you’re doing exactly the same thing with exactly the same computer as used in a demo, your results aren’t going to look exactly the same.CUDA acceleration only applies to a few things, and a lot of people seem to miss this point and expect magic across-the-board processing on the GPU.
Here’s what can be processed using CUDA by Premiere Pro CS5:
– some effects
– scaling
– blending modes
– interlacing/deinterlacingAnd even within those areas there are caveats, such as described here.
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Todd Kopriva, Adobe Systems Incorporated
Technical Support for professional video software
After Effects Help & Support
Premiere Pro Help & Support
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Hi, Todd. As you may have noticed on the Adobe PP CS5 forum, I’m trying (under another nickname) to track down the source, but without much success. I’m not trying to add to the rumor (of 100 CUDA cores cutoff), just trying to nail down the truth, and I’m happy to defer to you. As for the i7 cores getting a workout in my case, I suspect it’s due to my performing an h.264 encode which I gather leans more on the CPU than the GPU.
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> As for the i7 cores getting a workout in my case, I suspect it’s due to my performing an h.264 encode which I gather leans more on the CPU than the GPU.
All encoding is done on the CPU.
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Todd Kopriva, Adobe Systems Incorporated
Technical Support for professional video software
After Effects Help & Support
Premiere Pro Help & Support
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