Forwarded to devs CGroups / systemd scope units slowing down

[B4c4rd1]

TITLE:

CGroups / systemd scope units slowing down​

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE:

Plesk Onyx, Version 17.5.3 Update #25, Ubuntu 16.04.2 LTS‬, x64​

PROBLEM DESCRIPTION:

Hi,

I can identify a new problem.

Systemd always creates a separate folder per visitor/session under /run/systemd/system.

For example:

1. session-c288942.scope.d
   
2. session-c288940.scope.d
   
3. session-c288939.scope.d

The biggest problem is that systemd deletes this folder does not automatically once the connection has been disconnected.

The more folders are present here, takes the longer the restart of systemd.

Now, with CGroups enabled, the process may take a long time.

My workaround:

Create a cronjob with the following command:

systemctl |grep "abandoned" |sed "s/\.scope.*/.scope/" |xargs systemctl stop

And do the job every hour.​

STEPS TO REPRODUCE:

Open many connections until you have about 30,000 objects in the folder /run/systemd/system. Yes, that takes a long time! But then you can check exactly how long a domain update takes.

Only test this with HDD! Dont test this with SSD drives.​

ACTUAL RESULT:

No automatic clean the folder: /run/systemd/system.​

EXPECTED RESULT:

Automatic clean the folder over time?​

ANY ADDITIONAL INFORMATION:

Is this a bug of ubuntu? Systemd? Plesk? But I know that it is a problem.​

YOUR EXPECTATIONS FROM PLESK SERVICE TEAM:

Help with sorting out​

 

[B4c4rd1]

Further information: Leak of scope units slowing down "systemctl list-unit-files" and delaying logins · Issue #1961 · systemd/systemd · GitHub

 

[IgorG]

Thank you for report.
Developers have confirmed that it is known issue, already submitted as PPPM-7414

 

[Gio Nalla]

Hi,

Good day!
Is there already a fix for PPPM-7414?

 

[IgorG]

Is there already a fix for PPPM-7414?

The fix is expected in the next Plesk version.

 

[B4c4rd1]

The fix is expected in the next Plesk version.

How does this look like? How is the problem solved?

 

[IgorG]

How does this look like? How is the problem solved?

Sorry, no additional details.