[pacman-dev] pacman -Qs first-run performance

[Philipp Überbacher]

Excerpts from Karol Blazewicz's message of 2011-09-01 20:40:52 +0200:
> On Thu, Sep 1, 2011 at 8:37 PM, Philipp Überbacher
> <hollunder at lavabit.com> wrote:
> > Excerpts from Dan McGee's message of 2011-09-01 20:17:47 +0200:
> >> On Thu, Sep 1, 2011 at 1:14 PM, Denis A. Altoé Falqueto
> >> <denisfalqueto at gmail.com> wrote:
> >> > On Thu, Sep 1, 2011 at 2:57 PM, Philipp Überbacher <hollunder at lavabit.com> wrote:
> >> >> It's really kind of weird that the web search takes longer than the
> >> >> local search, intuition dictates it should be the other way around.
> >> >
> >> > It is not a web search, though. -Ss searches in /var/lib/pacman/sync
> >> > and -Qs searches in /var/lib/pacman/local.
> >> Yes, this is definitely not a web search, I'm not sure where that idea
> >> came from? Is our documentation unclear?
> >
> > It simply arose because it searches for packages that aren't necessarily
> > installed. If it only searches everything it knows from the last 'y'
> > that's fine too.
> >
> >> > Both are limited by the
> >> > same I/O bus. Theoretically, you'll have less packages installed than
> >> > not installed, so the size of /var/lib/pacman/local should be smaller
> >> > than /var/lib/pacman/sync. Could you compare the sizes of those two
> >> > directories?
> >> This won't really be indicative of anything- the sync databases are
> >> both single-file and compressed, meaning there is no 4K filesystem
> >> block rounding per file and text compresses well, among other things.
> >> More useful numbers would be a lot of the commands I dropped in my
> >> last email.
> >>
> >> -Dan
> >
> > I ran ncdu anyway, local has 42MiB, sync 1.2MiB. The more interesting
> > numbers are: Items: 4606.
> > I don't know whether Items includes directories. sync accounts for 6
> > files, so from the file structure I assume I have either about 1500 or
> > 2300 packages installed, but there's probably a better way to find out.
> >
> > Regards,
> > Philipp
> >
> >
> >
> 
> 'pacman -Qq | wc -l' will tell you how many packages have you installed.
> My sync is 1.3 MB, local 8.1 MB, 1375 items.

$ pacman -Qq | wc -l
1429

Lots installed, few programs running.