mirror of
git://projects.qi-hardware.com/wernermisc.git
synced 2024-11-22 12:46:15 +02:00
03c5e4ffe7
- jrb.h, jrb.c (jrb_find_or_insert): new function to look for a node and to insert a new one if not found - id.c (make_id): use jrb_find_or_insert to avoid looking up new nodes twice - TODO: report the improvement
39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
- optimize the search trees. Right now, we have 81812 calls to make_id
|
|
for 14601 packages, resulting in 7420560 calls to comp_id.
|
|
|
|
There can be at most 2 new identifiers per package (package name and
|
|
version), so a perfectly balanced tree should have a depth of no more
|
|
than 14. If we assume that each call to make_id searches to the bottom,
|
|
we'd get 1145368 calls to comp_id, about 15% of the current number.
|
|
|
|
So the tree is clearly degenerated.
|
|
|
|
Update: after switching to red-black trees, we get only 1497604 calls
|
|
to comp_id. This is 130% of the "good case" estimate above. Insertion
|
|
of a new node is currently done with two lookups, so we'll get rid of
|
|
some more lookups after further optimization.
|
|
|
|
Update: after merging the two lookups per new node into one, we're at
|
|
1172642 calls to comp_id, or 102% of the predicted "good case".
|
|
|
|
- check whether introducing a new package would cause a conflict
|
|
|
|
- compile the list of conflicts of installed packages
|
|
|
|
- handle Provides:
|
|
|
|
- if there are multiple choices, try to prefer more recent versions
|
|
|
|
- sort prerequisites such that they can be installed in the specified order
|
|
|
|
- consider Architecture:
|
|
|
|
- what to do with explicit and implicit replacement ?
|
|
|
|
- if we can't resolve the prerequisites, give at least a hint of what one
|
|
can do to improve the situation
|
|
|
|
- check database for internal consistency
|
|
|
|
- implement keyword search
|