What must I do with the systemd-analyze critical chain informations

What must I do with the systemd-analyze critical chain informations - Printable Version

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What must I do with the systemd-analyze critical chain informations - lolo75 - 10-20-2020

Hello,

Very slow start, over 3 minutes...

=> cmd: sudo systemd-analyze time

Startup finished in 37.291s (kernel) + 2min 23.334s (userspace) = 3min 625ms
graphical.target reached after 2min 23.280s in userspace

After read many answers on the same slow start subjects, try few solutions without succes.

=> cmd: sudo systemd-analyze critical chain

graphical.target @2min 23.280s
└─lightdm.service @2min 22.412s +867ms
└─systemd-user-sessions.service @56.566s +494ms
└─network.target @56.562s
└─NetworkManager.service @40.913s +15.648s
└─dbus.service @32.538s
└─basic.target @31.724s
└─sockets.target @31.724s
└─snapd.socket @31.553s +170ms
└─sysinit.target @31.532s
└─snapd.apparmor.service @31.466s +64ms
└─apparmor.service @17.074s +14.228s
└─local-fs.target @17.021s
└─local-fs-pre.target @16.467s
└─keyboard-setup.service @6.033s +10.433s
└─systemd-journald.socket @6.000s
└─system.slice @5.999s
└─-.slice @5.109s

=> cmd: sudo systemd-analyze blame

1min 50.318s vboxadd.service
1min 26.211s plymouth-quit-wait.service
43.699s resolvconf-pull-resolved.service
36.044s dev-sda1.device
23.630s udisks2.service
23.536s mysql.service
23.234s snapd.service
22.225s networkd-dispatcher.service
19.626s systemd-journal-flush.service
15.648s NetworkManager.service
15.449s accounts-daemon.service
14.636s laptop-mode.service
14.228s apparmor.service
13.446s gpu-manager.service
12.104s apport.service
11.692s ModemManager.service
11.525s devolonetsvc.service
10.634s etc-setserial.service
10.433s keyboard-setup.service
9.958s lm-sensors.service
9.685s [email protected]
9.608s networking.service
9.541s console-kit-log-system-start.service

So what seems the solution at your opinion ?

(haveged solution already tested without success)

Many thanks

Laurent

Re: What must I do with the systemd-analyze critical chain informations - Moltke - 10-20-2020

Quote:lolo75[/member]]Very slow start, over 3 minutes...So what seems the solution at your opinion ?

Sometimes, most of times actually, the

Code:
systemd-analyze

output doesn't point the culprit of a "slow start", it just shows how much time each process takes to start but that doesn't neccesarily mean they're causing it, could be something else; old, low powered hardware, files system error and yes, it may be that one process is taking to long to start thus slowing down the whole boot up process. In your case,

Code:
vboxadd.service

seems to be taking too long to start, if you don't use virtualbox or don't need that service to start at boot, you can disable it

Code:
sudo systemctl stop vboxadd.service

enter your password when asked, hit enter, then do

Code:
sudo systemctl disable vboxadd.service

Reboot and check whether LL keeps starting slow or not.

Hope this helps! Smile

Re: What must I do with the systemd-analyze critical chain informations - lolo75 - 10-20-2020

Hello Moltke,

Understood the informations coming from systemd-analyze time.
Done your advices

=> cmd systemd-analyze blame

1min 30.243s nmbd.service
57.570s resolvconf-pull-resolved.service
28.391s systemd-journal-flush.service
27.938s dev-sda1.device
24.810s mysql.service
19.786s keyboard-setup.service
17.993s ufw.service
16.123s lvm2-monitor.service
16.070s snapd.service
15.289s systemd-modules-load.service
15.232s systemd-tmpfiles-setup-dev.service
14.623s [email protected]
11.954s NetworkManager.service
11.368s udisks2.service
10.065s ModemManager.service
10.027s NetworkManager-wait-online.service
9.007s apparmor.service
6.220s accounts-daemon.service
4.621s networking.service
4.454s console-kit-log-system-start.service
4.393s lmt-poll.service
4.379s rsyslog.service
4.353s networkd-dispatcher.service
4.241s grub-common.service
3.478s lightdm.service
3.472s plymouth-quit-wait.service

So results are faster boot.

I now note than
- "vboxadd.service" has disappeared, as expected
- "plymouth-quit-wait.service" now takes 3.5 sec compared with 1min26...
- "nmbd.service" is now the longuest process with 1min 30sec...

Now, shutdown the computer and restart again...

Results are :

=> cmd sudo systemd-analyze time

Startup finished in 37.363s (kernel) + 1min 22.578s (userspace) = 1min 59.942s
graphical.target reached after 1min 22.505s in userspace

=> cmd sudo systemd-analyze blame

42.724s resolvconf-pull-resolved.service
32.790s mysql.service
28.599s dev-sda1.device
28.486s systemd-journal-flush.service
20.695s snapd.service
18.441s keyboard-setup.service
17.515s ufw.service
15.258s lvm2-monitor.service
15.034s systemd-tmpfiles-setup-dev.service
14.522s systemd-modules-load.service
10.506s NetworkManager.service
9.950s [email protected]
8.839s ModemManager.service
7.541s accounts-daemon.service
7.013s apparmor.service
5.669s smbd.service
5.495s NetworkManager-wait-online.service
5.437s rsyslog.service
5.325s udisks2.service
5.109s nmbd.service
4.890s devolonetsvc.service
4.681s systemd-resolved.service
4.426s apport.service

See also : https://askubuntu.com/questions/1247213/resolvconf-pull-resolved-service-and-plymouth-quit-wait-service-slows-down-my-ub

and then : https://doc.ubuntu-fr.org/snap
specially the 5. and 6.

i.e with an other computer, i5-6200U @ 2.3GHz, same LL4.8 : kernel 4.259sec and userspace 40.5 sec...
Same order process : vboxadd.service 34 sec and plymouth-quit-wait.service for 33 sec then 6sec and less for all the others process...

Thanks

Laurent

Re: What must I do with the systemd-analyze critical chain informations - Moltke - 10-21-2020

(10-20-2020, 02:40 PM)lolo75 link Wrote: Hello Moltke,

Understood the informations coming from systemd-analyze time.
Done your advices

So results are faster boot.

I now note than
- "vboxadd.service" has disappeared, as expected
- "plymouth-quit-wait.service" now takes 3.5 sec compared with 1min26...
- "nmbd.service" is now the longuest process with 1min 30sec...

i.e with an other computer, i5-6200U @ 2.3GHz, same LL4.8 : kernel 4.259sec and userspace 40.5 sec...
Same order process : vboxadd.service 34 sec and plymouth-quit-wait.service for 33 sec then 6sec and less for all the others process...

Thanks

Laurent

Do any of those computer have a SSD or a HDD? If a SSD then it should definitely start faster than that, if a HDD then it's likely normal since those tend to be slower. By the way, when pasting terminal output in the forum, try using bbcodes, just click on the [Image: CAjnSm7.png]

symbol from the menu above, it helps readbility so it looks like this

Code:

systemd-analyze blame



1min 30.243s nmbd.service

         57.570s resolvconf-pull-resolved.service

         28.391s systemd-journal-flush.service

         27.938s dev-sda1.device

         24.810s mysql.service

         19.786s keyboard-setup.service

         17.993s ufw.service

         16.123s lvm2-monitor.service

         16.070s snapd.service

         15.289s systemd-modules-load.service

         15.232s systemd-tmpfiles-setup-dev.service

         14.623s [email protected]

         11.954s NetworkManager.service

         11.368s udisks2.service

         10.065s ModemManager.service

         10.027s NetworkManager-wait-online.service

          9.007s apparmor.service

          6.220s accounts-daemon.service

          4.621s networking.service

          4.454s console-kit-log-system-start.service

          4.393s lmt-poll.service

          4.379s rsyslog.service

          4.353s networkd-dispatcher.service

          4.241s grub-common.service

          3.478s lightdm.service

          3.472s plymouth-quit-wait.service

It's a lot nicer and easier to read Smile