what if native systemd service is slower than old sysvinit script?

Ralf Corsepius rc040203 at freenet.de
Thu Sep 15 15:54:11 UTC 2011


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.

Ralf




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