CUDA32 vs CUDA50


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Message boards : Number crunching : CUDA32 vs CUDA50

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Profile Michael Banta
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Message 1458567 - Posted: 29 Dec 2013, 21:50:32 UTC
Last modified: 29 Dec 2013, 21:52:49 UTC

Are cuda50 work units bigger/more complex than cuda42 work units? I assume so but don't know.

My GTX 560 runs cuda42 WUs faster than my GTX 780 run cuda50 WUs. Both machines are 'optimized'.

Any thoughts?

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Profile Mike
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Message 1458569 - Posted: 29 Dec 2013, 22:02:43 UTC

No the work units are similar.
Just different angle ranges.
But has nothing to do with the cuda version.
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Richard Haselgrove
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Message 1458570 - Posted: 29 Dec 2013, 22:02:59 UTC - in response to Message 1458567.
Last modified: 29 Dec 2013, 22:03:39 UTC

The work units are identical.

The cuda42 application is better matched to the GTX 560 hardware: the cuda50 application is 'better' (but not ideally) matched to the GTX 780 hardware.

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Message 1458571 - Posted: 29 Dec 2013, 22:03:39 UTC - in response to Message 1458569.

The cuda42 units are smaller?
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Message 1458581 - Posted: 29 Dec 2013, 22:21:44 UTC

No, there is no difference in size, but there are short, medium and long workunits which all depend on the angle range contained in them.

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Message 1458595 - Posted: 29 Dec 2013, 23:44:27 UTC - in response to Message 1458581.
Last modified: 29 Dec 2013, 23:44:57 UTC

Which means they can take longer to process?
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Message 1458597 - Posted: 29 Dec 2013, 23:52:00 UTC
Last modified: 29 Dec 2013, 23:53:54 UTC

Yes, Vlars take the longest while Vhars are the shortest while the rest fall somewhere in between the 2.

[edit] Currently Vlars are not sent to GPU's though it has been suggested many times that there should be an "opt in" for these. [/edit]

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Message 1458626 - Posted: 30 Dec 2013, 2:11:04 UTC

What is the current AR limit for for a task to be labelled as vlar?
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Josef W. Segur
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Message 1458634 - Posted: 30 Dec 2013, 3:34:06 UTC - in response to Message 1458626.

What is the current AR limit for for a task to be labelled as vlar?

AR less than 0.120000, and that's hard coded in the splitter source so could only be changed by modifying the source and recompiling.
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Message boards : Number crunching : CUDA32 vs CUDA50

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