I know in mantra node, here is a parameter “use max processors”. but I don't think it can control CPU usage very well and PC still lag.
so I go to the windows task manager(WIN7 64bit) to turn off some CPU for mantra. but it will turn on all CPU automatically…

any idea? please.

I am not sure, if I understood you correctly…

As an alternative to restricting the number of used cores (in the mantra node, as you mentioned), you could switch the priority of houdinifx.exe-process to “lower than normal” via right-click the process in the task manager. All mantra.exe processes, started by this houdini session will inherit that setting.

In windows task manager, go to the ‘Processes’ tab and right click on the mantra.exe task. You should see ‘Set Affinity’ (just below ‘Set Priority’ ). Click ‘Set Affinity’ and you will get a popup window that allows you to select which processors you want to allow mantra to use.

thank you tow. switch the priority of houdinifx is work!