Good utility, thanks. 2011/3/31 Lennart Poettering <lenn...@poettering.net>
> Heya, > > I just added "systemd-analyze" to git. It's a little Python tool which > can help you figuring out why your boot is not as fast as it could be. > > If you run "systemd-analyze blame" it will print a list of all units > that have been started since boot, ordered by the time they took to > start up. If your service appears right at the top of the list, then > there's probably something to fix. But don't misunderstand this tool. It > will simply look how long each service took to start, it doesn't give > you any hint on why it did take so long. For example it could be because > the service was waiting for another service or for user input (for > example in the cryptsetup case). So, take the output with a grain of > salt and then it is quite interesting. Let the blame game begin! > > If you run "systemd-analyze plot > plot.svg && eog plot.svg" then you'll > look at a graphical plot of the boot processes showing how long we had > to had to wait for which unit to start up. The startup time will be > visible as a bright red bar. The runtime of a unit will be shown in > light pink. The output is a bit like bootchart, but on a very different > level, as this tells you something about the ordering and the units in > systemd. To optimize your boot process you probably want to look at both > outputs. > > For this to work properly you need to run systemd from git. Older > versions of systemd do not keep track of timestamps properly, and this > is fixed in git. > > On an older X300 with SSD and a reasonably complete Linux installation > systemd needs less than 1s to spawn all services at boot and enter idle > mode. If your installation takes longer, then you probably have a lot of > room for optimization. (1s to idle does not mean the bootup was > complete. It just means systemd started all processes it needed to start > and the machine might still be busy with those. But early boot/fsck and > stuff is all finished as are all SysV scripts, and graphical.target is > reached). > > Lennart > > -- > Lennart Poettering - Red Hat, Inc. > _______________________________________________ > systemd-devel mailing list > systemd-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/systemd-devel >
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