X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/9adb841c92be53fd1af796e4aae4437d3c098b54..b6774bc6afac48e2c0a122647edc1485e7174a6e:/doc/todo/optimisations.mdwn

diff --git a/doc/todo/optimisations.mdwn b/doc/todo/optimisations.mdwn
index 4e8118756..b8c4fa0da 100644
--- a/doc/todo/optimisations.mdwn
+++ b/doc/todo/optimisations.mdwn
@@ -1,25 +1,15 @@
-* Render each changed page only once. Currently pages are rendered up to 4
-  times in worst case (8 times if there's an rss feed).
+Ikiwiki has already been optimised a lot, however..
 
-  The issue is that rendering a page is used to gather info like the links
-  on the page (and other stuff) that can effect rendering other pages. So it
-  needs a multi-pass system. But rendering the whole page in each pass is
-  rather obscene.
-  
-  It would be better to have the first pass be a data gathering pass. Such
-  a pass would still need to load and parse the page contents etc, but
-  wouldn't need to generate html or write anything to disk.
+* Look at splitting up CGI.pm. But note that too much splitting can slow
+  perl down.
 
-  One problem with this idea is that it could turn into 2x the work in
-  cases where ikiwiki currently efficiently renders a page just once. And
-  caching between the passes to avoid that wouldn't do good things to the
-  memory footprint.
+  > It's split enough, or possibly more than enough, now. :-)
 
-  Might be best to just do a partial first pass, getting eg, the page links
-  up-to-date, and then multiple, but generally fewer, rendering passes.
+* 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.
 
-* Don't render blog archive pages unless a page is added/removed. Just
-  changing a page doesn't affect the archives as they show only the title.
+  > Seems to be O(Num Pages * Num Links in Page), or effectively O(N)
+  > pages for most wikis.
 
-* Look at splitting up CGI.pm. But note that too much splitting can slow
-  perl down.
+[[done]]