Hardware Problem

[radiosity1980]

Hello everyone, I have a problem with my Epyc 7702p (64 Core \ 128 thread) when simulating PhoenixFd it does not use all cores, but uses 50% of the cores. Can I solve this problem? (sorry for my poor language)
thanks

[georgi.zhekov]

Hey,

Can you tell us which versions of Phoenix and Windows are you using?

Thanks!

[Svetlin.Nikolov]

Hey,

I believe this CPU is using NUMA, which is, to put it simply, very bad for simulations. Check the "Hardware Advice for Faster Simulating" here https://docs.chaos.com/display/PHX4M...d+Installation (it's also a sticky topic here in the forums, check "Recommended Simulation hardware").

I also did some improvements over the last year for NUMA CPUs, so make sure to get a latest nightly build from here: https://nightlies.chaosgroup.com/#/phoenix4max/nightly (or if you are using Maya, from here: https://nightlies.chaosgroup.com/#/phoenix4maya/nightly)

Lastly, there is a NUMA Nodes field in the Simulation rollout of the Simulator, check here: https://docs.chaos.com/display/PHX4M...oke+Simulation. Using just one NUMA node could sometimes make the simulation even faster than using all nodes, so try this and see if it makes a difference for your scenes.

Hope this helps, cheers!

[radiosity1980]

Thanks for your help.
Now I download the latest version and try if the problem is solved. Today I realized that even during the calculation of the simulation render, the cpu does not go to 100%. Meter in a normal Vray render, it goes to 100%. Thanks and good job
Note: I have to admit that my CPU, Epyc7702P, gives me various problems, even in the benchmarks it has strange results, so maybe the problem is not the software but the hardware
Sorry for my poor language