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Diffstat (limited to 'doc/todo/optimisations.mdwn')
| -rw-r--r-- | doc/todo/optimisations.mdwn | 18 |
1 files changed, 3 insertions, 15 deletions
diff --git a/doc/todo/optimisations.mdwn b/doc/todo/optimisations.mdwn index 13a270b8f..0eb830cd0 100644 --- a/doc/todo/optimisations.mdwn +++ b/doc/todo/optimisations.mdwn @@ -4,18 +4,6 @@ * Look at splitting up CGI.pm. But note that too much splitting can slow perl down. -* The backlinks code turns out to scale badly to wikis with thousands of - pages. The code is O(N^2)! It's called for each page, and it loops - through all the pages to find backlinks. - - Need to find a way to calculate and cache all the backlinks in one pass, - which could be done in at worst O(N), and possibly less (if they're - stored in the index, it could be constant time). But to do this, there - would need to be a way to invalidate or update the cache in these - situations: - - - A page is added. Note that this can change a backlink to point to - the new page instead of the page it pointed to before. - - A page is deleted. This can also change backlinks that pointed to that - page. - - A page is modified. Links added/removed. +* The backlinks calculation code is still O(N^2) on the number of pages. + If backlinks info were stored in the index file, it would go down to + constant time for iterative builds, though still N^2 for rebuilds. |