On Fri, 24 Nov 2006, Gilboa Davara wrote:
Solution wise - yes, yum and apt are different - but target-wise, they
both designed to serve the same purpose.
Question is - can yum be optimized (E.g. by replacing the XML parser to
a faster/leaner one) - bringing it to a point where the performance
difference between Debian's apt and Fedora's yum is less staggering?
(Especially in query tasks)
The XML is already parsed by a module written in C and is fast enough not
to be a bottleneck I think. The XML files are only read during importing
the data into sqlite database, which is then used for all operations
(depsolving, querying etc).
FWIW, I don't think 'yum search foo' and such are slow at all these days,
only the depsolve stage remains a bit of a sore point speedwise. Where
exactly the time is spent and how to improve things .. profiling needed :)
BTW, Debian packages have far less dependency data in them than an average
rpm package does because automatic dependencies and provides are not used
there. Just an example:
$ dpkg -f libc6_2.3.6.ds1-8_amd64.deb |grep Provides
Provides: glibc-2.3.6.ds1-1, glibc-2.3.6-2
Contras that with FC6 glibc:
$ rpm -qp --provides glibc-2.5-3.x86_64.rpm |wc -l
300
Looking through 300 provides for matches is more expensive than going
through 2 provides :) glibc is a bit of an extreme case of course, not
every package is *that* bloated with soname-provides but it adds up pretty
fast and doesn't help speeding things. OTOH Debian has a larger
repository... my point is that there are lots of differences between deb
and rpm systems, comparing them in any sane way is not trivial.
- Panu -
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