On Fri, 6 Jul 2007, Michel Talon wrote:
Tim Kientzle said:
One approach I prototyped sometime back was to use
libarchive in pkg_add as follows:
* Open the archive
* Read +CONTENTS directly into memory (it's
guaranteed to always be first in the archive)
I can only concur with that. In my program
http://www.lpthe.jussieu.fr/~talon/check_pkg.py
i discovered that memory mapping +CONTENTS and then working
in memory before rewriting it was around 5 times faster
than reading line by line and parsing each line. See function
fix_pkg_database(). By the way i am writing a new +CONTENTS
fileand then renaming it, which avoids leaving a mess if
something goes astray like portupgrade does.
--
Michel TALON
Ok, excellent I'll try that then.
I'll work on an improved parser this weekend and probably will have more
conclusive results for next week, but for the immediate point in time I'll post
results on how slow / fast the critical sections were once I return home and
post process my data again for averages and standard deviations. I'll use this
as my basis for further conclusions this summer.
-Garrett
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