Weird behaviour... GPU faster than CPU when it should not...

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Dade
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Re: Weird behaviour... GPU faster than CPU when it should not...

Post by Dade » Tue Feb 11, 2020 8:17 pm

Thanks, it looks good, this fix may also have some unexpected implication like fixing the light tracing brightness variation on animations has been reported few times: light tracing is normalized by the total count of photons traced and if the total is wrong, the total brightness will be wrong too.

P.S. for other readers, jut keep in mind we are talking of CPUs with 64 threads or more, don't expect this kind of speed up on an 8 cores :!:
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Sharlybg
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Re: Weird behaviour... GPU faster than CPU when it should not...

Post by Sharlybg » Wed Feb 12, 2020 9:17 am

Can blendluxcore 2.3 beta1 be recompiled to include this fix so it easier for render farm to isntall the new build ?
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Dade
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Re: Weird behaviour... GPU faster than CPU when it should not...

Post by Dade » Wed Feb 12, 2020 12:24 pm

Sharlybg wrote:
Wed Feb 12, 2020 9:17 am
Can blendluxcore 2.3 beta1 be recompiled to include this fix so it easier for render farm to isntall the new build ?
We should release v2.3beta2 very soon.
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epilectrolytics
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Re: Weird behaviour... GPU faster than CPU when it should not...

Post by epilectrolytics » Wed Feb 12, 2020 12:57 pm

Dade wrote:
Tue Feb 11, 2020 8:17 pm
this fix may also have some unexpected implication like fixing the light tracing brightness variation on animations has been reported few times
Just rendered with the latest build from yesterday:
coronatest.mp4
(873.18 KiB) Downloaded 57 times
Light traced caustics still not constant :(

LordOdin
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Re: Weird behaviour... GPU faster than CPU when it should not...

Post by LordOdin » Thu Feb 13, 2020 3:24 pm

Dade wrote:
Tue Feb 11, 2020 8:17 pm
Thanks, it looks good, this fix may also have some unexpected implication like fixing the light tracing brightness variation on animations has been reported few times: light tracing is normalized by the total count of photons traced and if the total is wrong, the total brightness will be wrong too.

P.S. for other readers, jut keep in mind we are talking of CPUs with 64 threads or more, don't expect this kind of speed up on an 8 cores :!:
My 32 thread 3950x actually went from ~3:40 to ~2:30 so big improvements even with half the threads

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