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Using 24 cores rather than 16 does not reduce render times. Why?

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Message 1 of 4
Paul_Gregory
288 Views, 3 Replies

Using 24 cores rather than 16 does not reduce render times. Why?

Using MaxToArnold 2.3.33.2019 and backburner. 16 cores is only twice as fast as 6 cores and 24 cores seems to be the same render times. I can see 24 buckets, but the time stays the same. Any suggestions?

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Message 2 of 4

Can you monitor the load on the threads?

Try setting the threads manually. Should you not see 2 threads per core?

Also Windows scheduler is a issue with a lot of cores, there is software for a work around.

Message 3 of 4

Please post Arnold logs for both renders.



// Stephen Blair
// Arnold Renderer Support
Message 4 of 4
thiago.ize
in reply to: Paul_Gregory

If you have a 12 physical core machine, then with hyper threading (HT) you have 24 logical cores. HT usually only gives a small improvement of about 10-20%. That means going from 6->12 physical cores should be about 2x faster because these are real cores being used. Past 12 threads you're not going to get much of a speedup which explains why 16 is still only twice as fast as 6 and 24 is about the same as 16.

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