what if native systemd service is slower than old sysvinit script?
awilliam at redhat.com
Thu Sep 15 22:26:42 UTC 2011
On Thu, 2011-09-15 at 17:54 +0200, Ralf Corsepius wrote:
> On 09/15/2011 09:42 AM, "Jóhann B. Guðmundsson" wrote:
> > On 09/15/2011 05:25 AM, Ralf Corsepius wrote:
> >> In general, there are other factors coming into play, such as parallel
> >> startup using more memory, parallelization not providing many advantages
> >> on systems with a small number of CPU cores, hard synchronisation points
> >> in the bootup process, poorly configured "services", ... and finally ...
> >> bugs.
> >> Anyway, some more figures: On the same machine, bootup times when
> >> booting from a (slow) external (IDE) USB2 HD:
> >> - Fedora 15/i386: ca. 135 secs.
> >> - Ubuntu 11.04/i386: ca. 70 secs.
> >> [Here bootup time: Wirst watch measured time from "grub prompt" to
> >> "login screen"]
> >> It shows the effect of slow disks (60secs w/ internal HD vs. 2.15
> >> minutes w/ USB HD), but raises questions on why Ubuntu appears to be so
> >> much faster in this configuration.
> > Could you run systemd-analyze plot> bootup.svg and post it somewhere
> > online
> See: http://corsepiu.fedorapeople.org/scratch/bootup-20110915.1.svg
> FWIW: Though the log says 110s, the wrist watch measured bootup time is
> ca. 120-140 secs.
OS-side boot measurement tools cannot know how long the BIOS/EFI and
bootloader stages of boot took.
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