[systemd-devel] Strange output of `systemd-analyze critical-chain`

[Michael Biebl]

systemd-analyze and systemd-analyze critical-chain output can be
misleading sometimes.
Would it be possible for you to install systemd-bootchart.
This will give you a much better picture of which process uses IO/CPU
ressources.

2016-11-15 21:40 GMT+01:00 Paul Menzel <paulepanter at users.sourceforge.net>:
> Dear systemd folks,
>
>
> I am using systemd 232-3 from Debian sid/unstable.
>
> ```
> $ systemd --version
> systemd 232
> +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDNar systemd folks,
> ```
>
> On the underpowered ASRock E350M1, startup is quite slow.
>
> The output of `systemd-analyze blame` also looks quite strange.
>
> ```
> $ systemd-analyze critical-chain
> The time after the unit is active or started is printed after the "@" character.
> The time the unit takes to start is printed after the "+" character.
>
> graphical.target @3min 6.269s
> └─acct.service @6min 32.163s +55ms
>   └─basic.target @1min 29.644s
>     └─paths.target @1min 29.639s
>       └─cups.path @1min 29.634s
>         └─sysinit.target @1min 29.554s
>           └─systemd-timesyncd.service @1min 29.275s +263ms
>             └─systemd-tmpfiles-setup.service @1min 28.575s +620ms
>               └─systemd-journal-flush.service @13.493s +1min 15.054s
>                 └─var.mount @12.408s +1.057s
>                   └─systemd-fsck at dev-map\x2dvar.service @12.377s +17ms
>                     └─dev-mapper-speicher\x2dvar.device @12.205s
> ```
>
> It jumps from 1:30 to 6:32 minutes but the difference is shown as 55
> ms.
>
> As written, the systemd is quite underpowered. Might that be the
> reason?
>
> Here is the output of `systemd-analyze blame`.
>
> ```
>     5min 39.610s apt-daily.service
>     1min 21.012s tor at default.service
>     1min 15.054s systemd-journal-flush.service
>      1min 9.497s NetworkManager-wait-online.service
>          53.514s libvirt-guests.service
>          20.218s libvirtd.service
>          16.227s timidity.service
>          15.682s accounts-daemon.service
>          12.913s NetworkManager.service
>          12.889s vdr.service
>          11.915s apache2.service
>          11.143s ModemManager.service
>          10.434s dev-mapper-speicher\x2dusr.device
>          10.349s lirc.service
>           9.904s dev-mapper-speicher\x2droot.device
>           8.397s irqbalance.service
>           7.531s exim4.service
>           7.164s srv-bilder.mount
>           6.602s tor.service
>           6.568s lm-sensors.service
>           6.542s klogd.service
>           6.539s restorecond.service
>           6.518s rsyslog.service
>           6.509s pppd-dns.service
>           6.241s minissdpd.service
>           5.343s colord.service
>           4.982s ebtables.service
>           4.702s kdump-tools.service
>           4.631s polkit.service
>           4.620s rc-local.service
>           3.853s srv-filme.mount
>           3.302s binfmt-support.service
>           3.235s networking.service
>           3.157s lvm2-monitor.service
>           3.063s ssh.service
>           2.732s keyboard-setup.service
>           2.281s boot.mount
>           2.151s systemd-tmpfiles-setup-dev.service
>           1.915s gdm.service
>           1.857s systemd-tmpfiles-clean.service
>           1.788s console-setup.service
>           1.687s dev-mapper-speicher\x2dswap.swap
>           1.681s systemd-cryptsetup at md1_crypt.service
>           1.603s home.mount
>           1.270s iio-sensor-proxy.service
>           1.258s systemd-sysctl.service
>           1.063s systemd-random-seed.service
>           1.058s systemd-udevd.service
>           1.057s var.mount
>           1.049s speech-dispatcher.service
>           1.031s udhcpd.service
> […]
> ```
>
> Do you know what is going on?
>
>
> Thanks,
>
> Paul
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