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 Post subject: Help with slow computing
PostPosted: Tue May 05, 2015 10:28 pm 

Joined: Wed Apr 29, 2015 11:18 pm
Posts: 8
Forum,
Looking for help and tips on very slow computing. My computer speeds up as it crumches data, but is still very slow. With Head tracking, I am getting 8.0 to 2.8 secs/frame. GPU loading for both GPUs is always less than 27%, CPU loading is always under 12%.

Any thoughts on how to make this faster are very appreciated. The only strange thing on my system is both monitors rotated to portrait (tall).

iPi Pro + Biomech 3.2.0.182

Manufacturer Dell Inc. ------------------------------------------------------
Model Precision T7610
Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz, 12 core (2x, 24 core total)
Total amount of system memory 16.0 GB RAM
Windows 7 Professional 64-bit operating system

Storage --------------------------------------------------------------------------------
Total size of hard disk(s) 745 GB
Disk partition (C:) 220 GB Free (279 GB Total) OS
Disk partition (D:) 439 GB Free (466 GB Total) Data Disk

Graphics--------------------------------------------------------------------------------
Display adapter type NVIDIA GeForce GTX 770 (2x)
Total available graphics memory 4096 MB
Dedicated graphics memory 2048 MB
Dedicated system memory 0 MB
Shared system memory 2048 MB
Display adapter driver version 9.18.13.4752
Primary monitor resolution 1200x1920
Secondary monitor resolution 1200x1920
DirectX version DirectX 10

???????????????????????


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PostPosted: Wed May 06, 2015 3:45 am 
iPi Soft

Joined: Wed Jan 11, 2012 6:12 am
Posts: 2085
Location: Moscow, Russia
Hi
What are the performance numbers when using a single GPU in Mocap Studio?


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PostPosted: Wed May 06, 2015 3:14 pm 

Joined: Wed Apr 29, 2015 11:18 pm
Posts: 8
Do I need to physically take the card out, or just uncheck it in iPi Mocap studio?


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PostPosted: Wed May 06, 2015 3:38 pm 

Joined: Wed Apr 29, 2015 11:18 pm
Posts: 8
With the 2nd card unchecked, processing is much better.

Head Tracking
2.051-1.161 Secs/frame

No Head Tracking
0.809-0.631 Secs/frame


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PostPosted: Thu May 07, 2015 1:15 pm 

Joined: Wed Apr 29, 2015 11:18 pm
Posts: 8
GPU loading was up to 65.5% as well.


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PostPosted: Fri May 08, 2015 2:20 pm 
iPi Soft

Joined: Wed Jan 11, 2012 6:12 am
Posts: 2085
Location: Moscow, Russia
Thank you for the feedback.
We have already noticed a decrease of performance on one of our dual-GPU configurations and are working on a fix currently. We'll notify you when we have a beta version for testing.


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PostPosted: Thu May 14, 2015 11:07 am 

Joined: Wed Apr 29, 2015 11:18 pm
Posts: 8
Vasili,
Thank you for the response. Please let me know if there is any data I can post, or tests or Beta's I can help you with.

Also, a question of philosophy and your programming methods:

In general, do you recommend 1x $400 GPU or 2 $200 GPUs for performance and speed of processing?

I am not sure if this question has an answer without knowing how your team thinks about distributing load across the GPUs, and then re-combining and re-sync'ing the work streams.

I assumed 2x cards at half the price would be a better option, and built my system that way.


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PostPosted: Fri May 15, 2015 1:20 am 
iPi Soft

Joined: Wed Jan 11, 2012 6:12 am
Posts: 2085
Location: Moscow, Russia
Generally, we recommend the opposite: one high-end GPU is better than two mid-range GPUs.
With current algorithms in our software 2 GPUs provide at most 1.6 times improvement over 1 GPU of the same model. Moreover, with "light" camera configs like 1 Kinect or 3-4 PS Eyes dual GPUs give no advantage and may actually perform worse. Because in this case computations are not so intensive to fully utilize even a single GPU, and multiple GPUs always require some overhead to distribute the payload.


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PostPosted: Sat Aug 08, 2015 7:01 am 
iPi Soft

Joined: Wed Jan 11, 2012 6:12 am
Posts: 2085
Location: Moscow, Russia
V3.2.3.190 contains performance improvements for multiple GPUs which may solve this issue.


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