Re: [gentoo-user] new machine : start-up time

[Volker Armin Hemmann <volkerarmin@googlemail.com>]

Am Samstag, 13. Oktober 2012, 16:40:45 schrieb Canek Peláez Valdés:
> On Sat, Oct 13, 2012 at 4:14 PM, Volker Armin Hemmann
> 
> <volkerarmin@googlemail.com> wrote:
> > Am Samstag, 13. Oktober 2012, 15:57:31 schrieb Canek Peláez Valdés:
> >> On Sat, Oct 13, 2012 at 3:40 PM, Canek Peláez Valdés <caneko@gmail.com>
> > 
> > wrote:
> >> > On Sat, Oct 13, 2012 at 3:24 PM, Philip Webb <purslow@ca.inter.net> 
wrote:
> >> >> Regulars will remember the threads re the machine I built recently.
> >> >> I thought they mb interested in the start-up time now all is working :
> >> >> Gigabyte BIOS  10 s , Linux Lilo prompt - login prompt  8 s ,
> >> >> 'startx' - GUI ready  4 s : total  22 s  + entering userid+password ;
> >> >> I start the I/net connection (Dhcpcd) manually from the GUI ( 15 s ).
> >> >> I assume most of the speed is attributable to the SSD,
> >> >> perhaps a bit to the 1600 MHz memory; of course, Gentoo shares the
> >> >> honors;
> >> >> my desktop manager is Fluxbox & I start apps on desktops manually.
> >> > 
> >> > Toshiba Portégé Z830, with an iCore 5 at 1.60GHz, 6 GB of memory, and
> >> > a tiny 128 GB SSD. It takes 12 seconds from GRUB to GDM, and from the
> >> > time I enter my password and my GNOME 3 desktop is ready it takes
> >> > another 6 seconds, so 18 seconds in total (plus how much it takes for
> >> > me to click in my user and enter my password).
> >> > 
> >> > Like you, I attribute most of the speed gain to the SSD. The rest is
> >> > systemd.
> >> 
> >> Damn, is GNOME fat. I booted to text console (disabled GDM), and I
> >> also disabled plymouth. From GRUB2 to login prompt it takes less than
> >> 6 seconds, so the really slow part is starting GDM and then switching
> >> to GNOME 3. The BIOS is pretty fast, it takes 4 seconds from power on
> >> to the GRUB2 menu.
> >> 
> >> The fast part (GRUB2->login prompt) is because of systemd.
> > 
> > I doubt that,
> 
> Install systemd and do the test; I got the numbers to prove it.
> systemd is consistently faster than OpenRC (which doesn't even
> properly  support parallel starting of services), sometimes several
> times faster.
> 
> Luca Barbato mentioned about a way to make OpenRC use busybox in
> reentrant mode; the difference in speed in that case should be less.
> However, the fact is that OpenRC doesn't support parallel start of
> services; it said so in its own documentation:
> 
> https://bugs.gentoo.org/show_bug.cgi?id=391945#c10
> 
> "rc_parallel has never officially been declared a stable feature (see
> the comments in rc.conf regarding this)."
> 
> So no matter how fast the scripts could execute (which anyway will be
> slower than small highly optimized C programs), the lack of proper
> parallelization will make OpenRC slower than systemd.
> 
> So doubt as much as you want. It doesn't change the fact that (in this
> particular issue), you are wrong.
> 

and since I use openrc with parallel startup, I just doubt it even more.

The place where I lose time is starting of my five md-raids. And that is 
something not even systemd can speed up. 

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