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GPU+CPU Processing slower than GPU/CPU only (OS X 10.8)

 
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valleo



Joined: 17 Aug 2011
Posts: 50

PostPosted: Sun Jul 29, 2012 2:37 pm    Post subject: GPU+CPU Processing slower than GPU/CPU only (OS X 10.8) Reply with quote

I'm on Retina MacBook Pro (OS X 10.8, CUDA drivers 5.0.17) and when I activate CPU+GPU processing in Neat Video (latest version 3.2) the speed is much slower than CPU/GPU only.

Is this a known bug?
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NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Sun Jul 29, 2012 9:30 pm    Post subject: Reply with quote

Please post the log from Optimize window in NV preferences.

Thank you,
Vlad
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valleo



Joined: 17 Aug 2011
Posts: 50

PostPosted: Sun Jul 29, 2012 9:58 pm    Post subject: Reply with quote

Frame: 1920x1080 progressive, 32 bits per channel, Radius: 1 frame
Running the test data set on up to 8 CPU cores and on up to 1 GPU

CPU only (1 core): 1.71 frames/sec
CPU only (2 cores): 3.4 frames/sec
CPU only (3 cores): 4.69 frames/sec
CPU only (4 cores): 5.41 frames/sec
CPU only (5 cores): 5.18 frames/sec
CPU only (6 cores): 5.15 frames/sec
CPU only (7 cores): 4.93 frames/sec
CPU only (8 cores): 4.9 frames/sec
GPU only (GeForce GT 650M): 2.42 frames/sec
CPU (1 core) and GPU (GeForce GT 650M): 2.17 frames/sec
CPU (2 cores) and GPU (GeForce GT 650M): 3.76 frames/sec
CPU (3 cores) and GPU (GeForce GT 650M): 4.95 frames/sec
CPU (4 cores) and GPU (GeForce GT 650M): 5.65 frames/sec
CPU (5 cores) and GPU (GeForce GT 650M): 5.62 frames/sec
CPU (6 cores) and GPU (GeForce GT 650M): 5.41 frames/sec
CPU (7 cores) and GPU (GeForce GT 650M): 5.32 frames/sec
CPU (8 cores) and GPU (GeForce GT 650M): 5.26 frames/sec

Best combination: CPU (4 cores) and GPU (GeForce GT 650M)

Hm...now it's faster. One minute ago, GPU speed was about 1 fps, CPU speed is just constant. Crazy!
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NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Sun Jul 29, 2012 11:08 pm    Post subject: Reply with quote

The CPU seems to be twice faster than that GPU, so it is probably better to use the CPU alone. Mobile GPUs are typically not very fast (as compared with desktop versions) so it is not abnormal for a modern CPU to be that faster than GPU.

Vlad
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valleo



Joined: 17 Aug 2011
Posts: 50

PostPosted: Thu Aug 02, 2012 8:27 am    Post subject: Reply with quote

Okay, thank you very much.
But there is still a problem with the GTX 650M and Neat Video. Everytime I start denoising, the Terminal jumps in and says I'm out of memory.
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NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Thu Aug 02, 2012 8:40 am    Post subject: Reply with quote

Does that happen even if you disable use of GPU in NV Preferences?

Vlad
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valleo



Joined: 17 Aug 2011
Posts: 50

PostPosted: Thu Aug 02, 2012 8:46 am    Post subject: Reply with quote

No, just when I use GPU only or both together.
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NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Thu Aug 02, 2012 9:08 am    Post subject: Reply with quote

Apparently there is some problem with that GPU, perhaps the CUDA driver needs to be updated by NVidia.

Anyway, since that specific GPU is slower than CPU, I recommend to simply disable GPU and use the CPU alone.

Vlad
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