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LAB 2.6 foo.slice doesn't have any impact

Posts: 3
in LFS211 Class Forum - Discontinued

Somehow CPU usage stays 100%.
I also tried to make a [Slice] in foo.service.
I did the stop / reload-deamon /start.
I tried reboot once.
I tried to make /usr/lib/systemd/system/foo.slice
Operating System is Manjaro.

  1. /etc/systemd/system >>> cat foo.service foo.slice
  2.  
  3. [Unit]
  4. Description=Example service unit to run stress]
  5. Slice=foo.slice
  6. [Service]
  7. ExecStart=/usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  8. [Install]
  9. WantedBy=multi-user.target
  10.  
  11.  
  12. [Unit]
  13. Description="stress slice"
  14. [Slice]
  15. CPUQuota=30%

It just stays under the system.slice

  1. /etc/systemd/system >>> sudo systemctl status -l foo.service                                                                                       [1]
  2. ● foo.service - Example service unit to run stress]
  3.      Loaded: loaded (/etc/systemd/system/foo.service; disabled; vendor preset: disabled)
  4.      Active: active (running) since Fri 2021-02-26 17:12:40 CET; 57s ago
  5.    Main PID: 22562 (stress)
  6.       Tasks: 9 (limit: 4555)
  7.      Memory: 697.5M
  8.      CGroup: /system.slice/foo.service
  9.              ├─22562 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  10.              ├─22563 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  11.              ├─22564 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  12.              ├─22565 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  13.              ├─22566 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  14.              ├─22567 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  15.              ├─22568 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  16.              ├─22569 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  17.              └─22570 /usr/bin/stress --cpu 2 --io 2 --vm 4 --vm-bytes 256M
  18.  
  19. Feb 26 17:12:40 blabla systemd[1]: Started Example service unit to run stress].
  20. Feb 26 17:12:40 blabla stress[22562]: stress: info: [22562] dispatching hogs: 2 cpu, 2 io, 4 vm, 0 hdd

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Comments

  • Posts: 380

    Thank you for bringing this to our attention, investigating.
    Lee

  • Posts: 3

    Hi Lee

    I just tied to add the connection of the .slice under [Service] as in the Arch Wiki but it's not working either.
    https://wiki.archlinux.org/index.php/Cgroups#Grouping_unit_under_a_slice

    I also checked the solutions of the lab exercise but the Slice=foo.slice entry is missing completely. (Solutions are attached to the post)

    1. /usr/.../systemd/system >>> cat foo.service foo.slice   
    2.  
    3. [Unit]
    4. Description=Example service unit to run stress
    5. [Service]
    6. Slice=foo.slice
    7. ExecStart=/usr/bin/stress --cpu 4 --io 4 --vm 2 --vm-bytes 256M
    8. [Install]
    9. WantedBy=multi-user.target
    10.  
    11. [Unit]
    12. Description="stress slice"
    13. [Slice]
    14. CPUQuota=30%
  • Posts: 380

    Is the script track-STRESS.sh showing system.slice or foo.slice in the output?
    There may have been a default config option change causing cgroupsV2 to be activated.

    Thanks Lee

  • Posts: 3

    system.slice as in the systemctl status -l foo under CGroup: CGroup: /system.slice/foo.service

  • Posts: 380

    That may be the clue I was looking for, it should be foo.slice. I'll check it out and get back to you.

    Lee

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