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Comment by 1oooqooq | Hacker News Reader

it was only faster if you started with bloated redhat systems to begin with. but yes, it was the beginning of parallelism on init...

but the "faster boot" you're remembering are actually a joke at the time. since the team working on it were probably booting vms all the time, the system was incredible aggressive on shutdown and that was the source of it. something like it reboots so fast because it just throws everything out and reboot, or something. i don't really care much for the jokes but that was why everyone today remembers "systemd is fast".

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It mandates strict session termination, unlike the unsustainable wild west approach of older Unix systems. Proper resource deallocation is crucial for modern service management. When a user exits without approval of "lingering user processes," all their processes should be signaled to quit and subsequently killed.

i think the "unsustainable wild west" of sending sigterm, waiting and sending sighup was very good because it was adaptable (you were on your own if you had non standard stuff, but at least you could expect a contract)

Nowadays if you start anything more serious from your user session (e.g. start a qemu vm from your user shell) it will get SIGHUP asap on shutdown, because systemd doesn't care about non service pids. but oh well.

...which is where the jokes about "systemd is good for really fast reboots" came from mostly.

The old way has literally no way to differentiate between a frozen process and one that just simply wants to keep on running after the session's end, e.g. tmux, screen.

It's trivial to run these as a user service, which can linger afterwards. Also, systemd has a configurable wait time before it kills a process (the "dreaded" 2 mins timer is usually something similar)

which was fine for everything that didn't need a watchdog. systemd on the other hand still lacks most common usecase and people bend over backwards to implement them with what's available. ask distro maintainers who know the difference between the main types of service files...

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