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e1814ce372
This is a change of the underlying mechanism but it's not polished or optimized yet. The compare functions haven't been updated, so they work but produce compiler warnings because of type mismatches. - Makefile (OBJS): added jrb.o - id.h, id.c: use jrb instead of own dumb binary trees - TODO: brag about the efficiency improvement
36 lines
1.2 KiB
Plaintext
36 lines
1.2 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 lookup, so we'll get rid of
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some more lookups after further optimization.
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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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