How to limit IIS worker process memory and CPU consumption on a Plesk server?

1. Go to Service Plan > SERVICE_PLAN_NAME > Performance tab

• The maximum number of worker processes
• The Idle timeout in minutes
• The idle timeout action
• Maximum CPU usage (%)
• The action (Limit action) that IIS performs when a worker process exceeds the configured maximum CPU usage
• The reset period (Limit interval in minutes) for monitoring of CPU usage on an application pool
• Recycling at regular time intervals (minutes)
• Recycling when the maximum number of requests is reached
• Recycling when the maximum amount of virtual memory is used
• Recycling when the maximum amount of private memory is used

2. Set required values for the options below:

As an example, the command below sets the memory usage of application pool to 128MB for example.com :

1. Log in to the server via RDP

   Note: if direct RDP access to the server is not possible, contact server administrator for further assistance.

2. Execute the following command in command prompt

   C:\> plesk bin site.exe --set-iis-app-pool-settings example.com -iis-app-pool-turned-on true -recycling-by-virtual-memory 131072 -recycling-by-private-memory 131072

   Note: Values for memory limits set in kilobytes

   Note: The changes will be reflected in Plesk database, in iisapppools table, where iisapppools.ownerId refers to domain's ID.

3. To apply new limits application pool have to be re-cycled manually as below or automatically by timeout:

   C:\> "C:\Windows\SysWOW64\inetsrv\appcmd.exe" recycle apppool /apppool.name:"example.com(domain)(4.0)(pool)"

Additional information and options can be found on the following page of the Plesk Obsidian documentation:

site.exe: Sites | Plesk Obsidian documentation