V-Ray resetting affinity on each render

[LudvikKoutny]

Hi,

I just noticed that V-Ray resets 3dsmax.exe process affinity on start of each render. Is this expected behavior? And if so, is there any way to prevent it?

Thanks.

[Morbid Angel]

yeah its set to utilize the threads on systems with more then 64. I think there is a env setting called VRAY_USE_THREAD_AFFINITY=0 that will disable this option.

[vlado]

Yes, it is expected. You can disable this behavior with the environment variable VRAY_USE_THREAD_AFFINITY=0 but you will lose the ability to use more that 64 threads.

Best regards,
Vlado

[LudvikKoutny]

Thank you very much. I am too poor to ever even see 64thread machine from the distance out of the window of quickly passing train, so this won't bother me much

[Morbid Angel]

Well I have a 48 thread machine, but i prefere to reserve 1 or 2 threads for other tasks, or else vray aggressively consumes machine's cpu and I'm unable to do anything else.

[vlado]

The correct way to do it is to limit the number of threads that V-Ray uses, f.e. using the VRAY_NUM_THREADS environment variable, instead of dabbling with processor and thread affinity.

Best regards,
Vlado

[Pixelcon]

Yes, it is expected. You can disable this behavior with the environment variable VRAY_USE_THREAD_AFFINITY=0 but you will lose the ability to use more that 64 threads.

Best regards,
Vlado

I've been looking and looking on how to actually do this, but I can't for the life of me find any information. Is this done thru windows, or maxscipt for example? Would love some guidance

[^Lele^]

System environment variables.

https://www.google.it/search?q=windo...hrome&ie=UTF-8

[Vizioen]

With progressive, even if you change the affinity, it doesn't really change, cause if you check it again, it's been reset to all cores.

[Pixelcon]

With progressive, even if you change the affinity, it doesn't really change, cause if you check it again, it's been reset to all cores.

Even with the affinity env variable set?

[Vizioen]

Even with the affinity env variable set?

That, I haven't tried yet, I tried it the "old-fashioned" way.

[Pixelcon]

Yes, it is expected. You can disable this behavior with the environment variable VRAY_USE_THREAD_AFFINITY=0 but you will lose the ability to use more that 64 threads.

Best regards,
Vlado

Vizoen, can confirm this works for me.