On Mon, Aug 19, 2024 at 10:11 AM Barry <ba...@barrys-emacs.org> wrote: > > > > On 19 Aug 2024, at 06:55, Windl, Ulrich <u.wi...@ukr.de> wrote: > > > Despite of the fact that my version of systemd does not know that setting, > can you explain what the effect of AccuracySec= really is? > > > The docs https://www.man7.org/linux/man-pages/man5/systemd.timer.5.html say > this > > Note that this setting is primarily a power saving option > that allows coalescing CPU wake-ups. It should not be > confused with RandomizedDelaySec= (see below) which adds a > random value to the time the timer shall elapse next and > whose purpose is the opposite: to stretch elapsing of timer > events over a longer period to reduce workload spikes. For > further details and explanations and how both settings play > together, see below. > > So if you have 5 timers that expire about the same time this allows them to > all run at the sane time thus saving power.
It does explain why timers are run at the same time. It does not explain why "daily" + accuracy 6h runs at midnight, not close to 6am
