[falcolas]

This isn't backed up by Lennart's own blog post about the initial Systemd development:

> Unfortunately, the traditional SysV init system was not particularly fast.

> Another thing we can learn from the MacOS boot-up logic is that shell scripts are [...] slow in execution.

> it is also our plan to experiment with systemd not only for optimizing boot times

It seems like the real motivation was exactly reversed from your comment - speed first, and correctness as a happy accident.

He does put up a later post (biggest myths about systemd) some three years later which tries to change this impression, but that reads much more like an attempt to move the goalposts than an actual design goal.

http://0pointer.de/blog/projects/systemd.html

[the_why_of_y]

You have a point - clearly my comment over-stated it - let's say that both correctness and performance were design goals.

At the time Upstart was considered "the future" ... read the comment from Scott James Remnant on this post (unfortunately there doesn't seem to be a way to link to a G+ comment directly?):

https://plus.google.com/+KaySievers/posts/C3chC26khpq

The point is that Upstart's event model was found to be flawed, and the copyright assignment policy meant that fixing Upstart was undesirable.

This explains the filesystem problem (both relevant for reliability and performance) and claims that systemd solves it but Upstart cannot:

https://plus.google.com/+LennartPoetteringTheOneAndOnly/post...