3.08 - 15.2.3 speed

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3.08 - 15.2.3 speed

Postby dktw » Sun Jun 03, 2018 8:56 pm

dktw Sun Jun 03, 2018 8:56 pm
Hi,
Recently i wanted to catch up with octane new releases and I've install 3.08 - 15.2.3, last version I was using was 3.05.3 so it was a bit old :)
but basically what i saw was that the new version is actually slower for me ... 3.05.3 rendered a scene at 15min 10sec and 3.08 renders at same settings in 16min 44sec ...
not using adaptive sampling function, just max samples set to 1000, is it normal or am I doing something wrong ?
thanks in advance for any suggestions
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Re: 3.08 - 15.2.3 speed

Postby J.C » Mon Jun 04, 2018 9:03 pm

J.C Mon Jun 04, 2018 9:03 pm
Increasing Parallel samples to max value cam speed up rendering a bit at the cost of used memory.
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Re: 3.08 - 15.2.3 speed

Postby dktw » Wed Jun 06, 2018 9:01 pm

dktw Wed Jun 06, 2018 9:01 pm
Thanks for the reply J. C., for comparision I was using the same value, that is 16, in both renders
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Re: 3.08 - 15.2.3 speed

Postby grimm » Wed Jun 06, 2018 9:18 pm

grimm Wed Jun 06, 2018 9:18 pm
This is a tough one to answer because of the number of variables in it. In general with GPU coding, the more you add, the slower it runs. Every additional feature can slow down the render in many different ways. The reason is that GPUs hate branching, they need you to bundle as much as you can together so each individual processor accesses memory at the same time, etc. The more complex the program becomes the harder it is to do this and everything slows down.

Now this is just my 2 cents, I have no idea if the dev team will be able to optimize more or refactor the code, or it's a bug, etc., etc.
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Re: 3.08 - 15.2.3 speed

Postby J.C » Thu Jun 07, 2018 7:34 am

J.C Thu Jun 07, 2018 7:34 am
Have you compared standalone versions like 3.07 vs 3.08? Is it the same speed difference?
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Re: 3.08 - 15.2.3 speed

Postby dktw » Thu Jun 07, 2018 8:57 pm

dktw Thu Jun 07, 2018 8:57 pm
thanks for sugestions, grimm and J.C, grimm what You say makes sense, maby it is the way that it suposed to be, J.C i wasn't comparing standalone times just blender plugin, i dont really use standalone but I'll try to play with it on weekend
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