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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
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for 14601 packages, resulting in 7420560 calls to comp_id.
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There can be at most 2 new identifiers per package (package name and
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version), so a perfectly balanced tree should have a depth of no more
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than 14. If we assume that each call to make_id searches to the bottom,
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we'd get 1145368 calls to comp_id, about 15% of the current number.
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So the tree is clearly degenerated.
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Update: after switching to red-black trees, we get only 1497604 calls
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to comp_id. This is 130% of the "good case" estimate above. Insertion
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of a new node is currently done with two lookups, so we'll get rid of
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some more lookups after further optimization.
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Update: after merging the two lookups per new node into one, we're at
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1172642 calls to comp_id, or 102% of the predicted "good case".
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- check whether introducing a new package would cause a conflict
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- compile the list of conflicts of installed packages
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- handle Provides:
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- if there are multiple choices, try to prefer more recent versions
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- sort prerequisites such that they can be installed in the specified order
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- consider Architecture:
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- what to do with explicit and implicit replacement ?
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- if we can't resolve the prerequisites, give at least a hint of what one
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can do to improve the situation
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- check database for internal consistency
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- implement keyword search
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