On Sat, 12 May 2007, Kris Kennaway wrote:
On Sat, May 12, 2007 at 01:33:40PM -0500, Stephen Montgomery-Smith wrote:
I've done a little poking around. As of right now, I think that the
registering takes a huge amount of time inside of a function called
"sortdeps" which may be found in /usr/src/usr.sbin/pkg_install/lib/deps.c.
That function certainly looks like it can be optimized.
I believe that if this function is optimized, that practically all of the
slowness issues we have seen with pkg_add, pkg_deinstall, etc, will be
solved. Give me a few days. I think I will be able to make it work very
much faster. For starters it uses a bubble sort. I can understand why
they don't want to use a quicksort, because they want to check complete
integrety of comparison tree (i.e. that there are no internal loops), but
I recall seeing an algorithm due perhaps to one of or both of Hopcroft and
Tarjan that uses a depth first search, maybe 20 years ago, that should be
much faster, and I think I could reproduce it.
(But if someone else decides to work on it instead, email me immediately
so that I don't have to do it.)
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