IPR limit threads ?

V-Ray V-Ray for 3ds Max General
1

Since ipr in cpu mode hogs all available cores making it impossible to work, is there some way we can limit the amount of threads ? lets say you are using a threadripper with 32 or 64 cores and only in ipr you want it to use 16 cores that way everything stays responsive

2

​Not that I know of. You can try using VFB’s test resolution to lower the requirements for rendering.

EDIT:
Forgot to mention you can manually set the VRAY_NUM_THREADS environment variable to limit the thread usage, however, it affects all rendering.

Another thing you can do is to create a button for this script:


oldthreads=renderers.current.system_numThreads
renderers.current.system_numThreads=16
vraystartIPR()
renderers.current.system_numThreads=oldthreads​

It will reduce the number of used threads, start IPR, and afterwards return the old value.
Or you can manually set the threads (renderers.current.system_numThreads=16) and when you’re done return it to its default (usually 0).