NOTE: this guide is appliable only if you owe a Plesk Windows server (dedicated server or VPS); does not apply if you just owe a reseller or user account on a shhared Plesk server.

In Plesk it is possible to restrict CPU overload for any domain, but to do it you need to setup for it a dedicated IIS application pool.

  1. Enable the option Maximum CPU usage (%):

    Service Plans > Example Plan > Performance > Maximum CPU usage (%).

     

  2. Set up an action, which will be taken, when CPU limit is exceeded (Limit action):

    • Log Only: No action is taken when the CPU limit is exceeded. Only a warning will be written to the Windows Event Viewer (Custom Views > Administrative Events).

    • Shut Down: The process that exceeds its CPU limit will be forced to shut down. New process will be spawned.

    • Throttle: Reduce the CPU consumption to the value set for limit. It cannot be exceeded.

    • Throttle Under Load: Reduce the CPU consumption to the value set for the limit, but only if there are other processes that demand CPU time.

  3. Specify the time, the reset interval for monitoring of CPU usage by worker processes. (Limit Interval):

 

Monitoring CPU usage in IIS Manager

CPU usage of every application pool can be tracked in IIS Manager:

  1. Connect to your Plesk server via RDP.

  2. Start Internet Information Services (IIS) Manager at Windows Start > All Programs.

  3. In IIS Manager, click SERVER NAME > Worker Processes.

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