Better core scaling?

Started by Kadri, June 15, 2020, 07:14:20 am

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Hi Matt. If you compare Blenders core scaling to Terragen's i wanted to ask if there is anything new you can say.
With so much new and relatively affordable AMD CPU's it is more important then it was i think.
Can we expect better core scaling in the near future?


Is Cycles now NUMA aware? It wasn't last year in 2019. A EPYC only saw half cores being used, while it was still tiering the top of the list.

I do think our benchmarks are interesting and I wonder if there is bias in how TG handles the CPUs compared to Blender, or if people's systems benchmarking TG aren't well optimized, like lower end MBs etc.


June 20, 2020, 12:51:35 pm #2 Last Edit: June 20, 2020, 12:54:52 pm by Kadri
I don't know Jordan.

With both SMT ON i will do a basic test with Lightwave one with 16 and 32 cores.
It is an older (v.11.63) version but it had multi core support since many years.
Just curious.


I tried with Lightwave with 4,8,16 and 32 cores restricted within Lightwave and with task manager affinity setting:


I tried the same with a basic scene in terragen with the same method:


I expected worse actually with Terragen. It isn't so bad as i thought it would be. Not sure what to say. A longer benchmark (with the benchmark scene) might be better maybe. After 16 cores it looks like it is getting a little worse but i can live with that.


There is some added time with both situations but it seems TG is a little worse.


Yes. Curious how much worse it is with more cores.