Hello,
I wonder if there is an easy way to reduce the number of cores being used by V-Ray when activeshade rendering in 3ds Max? or to reduce the priority of those cores/threads.
It would be ideal to have a cores/threads control in the Render Settings. I have seen this with other render engines and it works well.
I can’t find them in V-Ray 
Regards
Mark
I usually set 3dsmax to low priority
With task manager, you can set each max session (and child V-Ray session) to the core affinity and priority you desire.
Thank you for you help guys. I will try that.
This forum is great, always fast and helpful responces 
It is actually not recommended to change 3dsMax affinity and priority from Windows Task Manager since it could affect the stability of the application.
3dsMax has a internal command for controlling the number of cores used for rendering, V-Ray also have such option via VRAY_NUM_THREADS environment variable, and it also have Low Thread Priority option in System and in ActiveShade settings:
http://ftp.chaosgroup.com/support/sc…9_15-13-29.jpg
http://ftp.chaosgroup.com/support/sc…9_15-14-08.jpg
None of the “proper” options actually gets the system in as good a multitasking state as the low priority in the task manager.
Opening Nuke while rendering, f.e., won’t happen with any of those options set (well, ofc if i sacrifice a thread at all times it will. But who’d want that by default? Also, often the need for a core isn’t planned, and a sys var change and relog is really not possible.), and the only way to dynamically reassign cores to a task as needed is the task manager.
I am not sure where the instability reports come from, for max, but i’ve had it in low-priority for the longest time, without any issue which wasn’t present in standard priority mode.
I stand to be corrected, ofc.
