Guillem Jover guil...@debian.org writes:
Hi Morten!
On Sat, 2009-09-05 at 01:34:50 +0200, Morten Hustveit wrote:
When running dpkg from a cold cache on a system where /var/lib/dpkg/info/
lies
on a harddisk, a lot of time is spent waiting for seeks between (typically)
thousands of files.
* Guillem Jover:
On kFreeBSD there's FIOGETLBA, but it seems to only be implemented for
the cd9660 file system, so not of much use. Also AFAIU from taking a
look at Linux, FIBMAP is being phased out by FIEMAP?
FIBMAP is the correct system call here because FIEMAP does unnecessary
work. It's
* Goswin von Brederlow:
Wouldn't it be better to read the files asynchronous and let the
underlying elevator code sort them into physical block order?
Linux doesn't support asynchronous I/O which doesn't bypass the cache,
so it's pretty much unusable for this purpose. It's also doubtful if
On Mon, 2009-10-05 at 11:56:25 +, Florian Weimer wrote:
* Guillem Jover:
On kFreeBSD there's FIOGETLBA, but it seems to only be implemented for
the cd9660 file system, so not of much use. Also AFAIU from taking a
look at Linux, FIBMAP is being phased out by FIEMAP?
FIBMAP is the
]] Goswin von Brederlow
| PS: How much does backup+restore of /var/lib/dpkg/info give you and
| how much does the ordering give you after that?
I tested a backup + restore on my laptop with ext4, and dpkg -S went
from ~30s to ~20s, so it's a significant improvement, but still slow.
(Sorry, I
Hi Morten!
On Sat, 2009-09-05 at 01:34:50 +0200, Morten Hustveit wrote:
When running dpkg from a cold cache on a system where /var/lib/dpkg/info/ lies
on a harddisk, a lot of time is spent waiting for seeks between (typically)
thousands of files. This patch ensures that the package iterator
* Morten Hustveit:
I haven't tried this, because it would require much more changes to
the dpkg code. The FIBMAP every .list file step takes less than
one second when operating from a cold disk cache, probably because
inodes aren't as scattered as file contents.
Very interesting. It turns
* Morten Hustveit:
When running dpkg from a cold cache on a system where
/var/lib/dpkg/info/ lies on a harddisk, a lot of time is spent
waiting for seeks between (typically) thousands of files. This
patch ensures that the package iterator used by
ensure_allinstfiles_available returns the
When running dpkg from a cold cache on a system where /var/lib/dpkg/info/ lies
on a harddisk, a lot of time is spent waiting for seeks between (typically)
thousands of files. This patch ensures that the package iterator used by
ensure_allinstfiles_available returns the packages sorted by their
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