Ubuntu(22.04)：systemd-analyze查看开机时间

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1.查看总的开机时间

$ systemd-analyze time
Startup finished in 2.266s (kernel) + 17.700s (userspace) = 19.966s
graphical.target reached after 17.682s in userspace

2.查看具体服务的启动时间

$ systemd-analyze blame
16.450s plymouth-quit-wait.service
14.254s vboxadd.service
 1.024s snapd.service
  997ms NetworkManager-wait-online.service
  906ms docker.service 

...

3.查看主要的时间消耗链路

$ systemd-analyze critical-chain
The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.

graphical.target @17.682s
└─multi-user.target @17.682s
  └─plymouth-quit-wait.service @1.231s +16.450s
    └─systemd-user-sessions.service @1.223s +7ms
      └─network.target @1.218s
... 

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