Your message dated Tue, 15 Dec 2009 11:44:53 +0100
with message-id <[email protected]>
and subject line Re: Bug#561104: dpkg: Add --readahead-db option to preload the
database
has caused the Debian Bug report #561104,
regarding dpkg: Add --readahead-db option to preload the database
to be marked as done.
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Bug report if necessary, and/or fix the problem forthwith.
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561104: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=561104
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--- Begin Message ---
Package: dpkg
Version: 1.15.5.4
Severity: wishlist
Currently, running dpkg on my system is rather slow and can take 10 seconds
or something to read the database. I propose an option --readahead-db which
uses readahead(2) on all database files; and would be called by APT during
package retrieval or dependency solving, so that the database is already
cached when dpkg is started to install packages.
-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (990, 'unstable'), (350, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.31-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages dpkg depends on:
ii coreutils 8.0-2 GNU core utilities
ii libc6 2.10.2-2 GNU C Library: Shared libraries
ii lzma 4.43-14 Compression method of 7z format in
dpkg recommends no packages.
Versions of packages dpkg suggests:
ii apt 0.7.24 Advanced front-end for dpkg
-- no debconf information
--
Julian Andres Klode - Debian Developer, Ubuntu Member
See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.
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--- End Message ---
--- Begin Message ---
Hi!
On Mon, 2009-12-14 at 16:50:10 +0100, Julian Andres Klode wrote:
> Package: dpkg
> Version: 1.15.5.4
> Severity: wishlist
>
> Currently, running dpkg on my system is rather slow and can take 10 seconds
> or something to read the database. I propose an option --readahead-db which
> uses readahead(2) on all database files; and would be called by APT during
> package retrieval or dependency solving, so that the database is already
> cached when dpkg is started to install packages.
The correct solution to the db slowness, is to make it faster, instead
of adding this specific hack for front-ends only.
There's several issues involved, one is the amount of *.list files,
that's going to be solved using the patch in 557560, and the one on
the mailing list to use FIEMAP, which I'll be merging for 1.15.6.
Further improvements might happen on this in the future, by using
either a cache, or by storing the files in a single archive or similar.
Then there's the problem of mostly always loading the available db,
which there's another bug report with patch which I'm also going to
merge for 1.15.6.
Those two should give a visible boost, for now. Thus I'm closing this
request, as it's being addressed already elsewhere.
regards,
guillem
--- End Message ---
