Resolved How to interpret Cgroups limits

[klowet]

Server operating system version

Debian 12

Plesk version and microupdate number

18.0.68 Update #2

Hi

I have a question about Cgroups. See eg. the settings below.
When the 'period to check' is set to '1 hour', what exactly does that mean?

• May the CPU/RAM usage never exceed its limit?
• Or not more then x-minutes?
• Or not more than 1 full hour?

For example the RAM limit of 2 GB: is this subscription able to use 3 GB for 1 hour and does Cgroups kicks in after that hour?

 

[Sebahat.hadzhi]

"Period to check" is only related to the "Notify when exceeded" option. Cgroups Manager counts the average consumption for each 5-minute interval. So, if you set it to an hour that will make a total of 12 intervals. If the threshold is exceeded in all 12 intervals Cgroups Manager will send a notification. Here's the documentation for further reference:

• (Plesk for Linux) Cgroups Manager

 

[klowet]

Okay, so:

• 'Period to check CPU/RAM usage' is only related to the 'Notify when exceeded' threshold is exceeded for that period of time.
• The 'Limit' is checked for the consumption for the last 5 minutes and kills the processes consuming more CPU / RAM?

Correct?

 

[Sebahat.hadzhi]

'Period to check CPU/RAM usage' is only related to the 'Notify when exceeded' threshold is exceeded for that period of time.

Correct

The 'Limit' is checked for the consumption for the last 5 minutes and kills the processes consuming more CPU / RAM?

The 5 minute interval is applied for the monitoring/notification purposes. As far as I am aware, the limit enforcement is in real time.

 

[klowet]

Thanks!