The systemd is a new addition to the linux system which is a replacement to the older initscripts. In earlier versions of arch linux (and on all other distros) the various daemons where started sequentially in the order in which the occure in the deamon array in rc.conf file. The systemd is an agressive parallization technique to start various deamons thus reducing you boot up time.Today I tried systemd and it was good.The system booted in less than 10 sec.
The arch community has dropped their support to the older method and insist users to use only systemd. So I gave it a try. The newer installtions come with systemd by default.
systemd can be installed by pacman -S systemd. Once installed the system can be booted using systemd by adding kernel parameter as /usr/lib/systemd/systemd
The systemd provides various tweaking facilites.
for example systemd-analyze returns the boot time of the system
systemd-analyze blame provides a verbose output of time taken by various services.
A simple graph can be ploted as
systemd-analyse plot tem.svg
eog tem.svg to view the graph.
More tips can be found at http://freedesktop.org/wiki/Software/systemd
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