1 [[!meta author="""joey"""]]
3 [[!meta authorurl="""http://ikiwiki.info/ikiwiki.cgi?page=users%2Fjoey&do=goto"""]]
5 [[!meta title="""change to todo/Improving_the_efficiency_of_match__95__glob on ikiwiki"""]]
7 [[!meta permalink="http://ikiwiki.info/recentchanges/#change-9a7387a53be2b1e182003f3e86cb76d7f10c4b67"]]
9 <div id="change-9a7387a53be2b1e182003f3e86cb76d7f10c4b67" class="metadata">
10 <span class="desc"><br />Changed pages:</span>
11 <span class="pagelinks">
13 <a href="http://git.ikiwiki.info/?p=ikiwiki;a=blobdiff;f=doc/todo/Improving_the_efficiency_of_match__95__glob.mdwn;h=0fc059ad7d169c2e35f3ea869bdc2f69be649857;hp=43571ead77346a1c5528360eec0e369958f2de7c;hb=9a7387a53be2b1e182003f3e86cb76d7f10c4b67;hpb=ab96249d5ad8f3ee9275be3fef9e3467b8f3ffdf" title="diff" rel="nofollow">[[diff|wikiicons/diff.png]]</a><a href="http://ikiwiki.info/ikiwiki.cgi?page=todo%2FImproving_the_efficiency_of_match__95__glob&do=goto" rel="nofollow">todo/Improving the efficiency of match_glob</a>
17 <span class="desc"><br />Changed by:</span>
18 <span class="committer">
20 <a href="http://ikiwiki.info/ikiwiki.cgi?page=users%2Fjoey&do=goto" rel="nofollow">joey</a>
23 <span class="desc"><br />Commit type:</span>
24 <span class="committype">git</span>
25 <span class="desc"><br />Date:</span>
26 <span class="changedate"><span class="relativedate" title="Tue, 16 Nov 2010 13:19:13 -0400">13:19:13 11/16/10</span></span>
27 <span class="desc"><br /></span>
31 <a href="http://ikiwiki.info/ikiwiki.cgi?rev=9a7387a53be2b1e182003f3e86cb76d7f10c4b67&do=revert" title="revert" rel="nofollow">[[revert|wikiicons/revert.png]]</a>
34 <div class="changelog">
44 diff --git a/doc/todo/Improving_the_efficiency_of_match__95__glob.mdwn b/doc/todo/Improving_the_efficiency_of_match__95__glob.mdwn
45 index 43571ea..0fc059a 100644
46 --- a/doc/todo/Improving_the_efficiency_of_match__95__glob.mdwn
47 +++ b/doc/todo/Improving_the_efficiency_of_match__95__glob.mdwn
48 @@ -22,6 +22,23 @@ Here's my patch - please consider it! -- [[KathrynAndersen]]
50 >>>>> I think it's because my patch focuses on match_glob while the memoize patch focuses on `glob2re`, and `glob2re` is called in `filecheck`, `meta` and `po` as well as in `match_glob` and `match_user`; thus the memoized `glob2re` is dealing with a bigger set of globs to look up, and thus could be just that little bit slower. -- [[KathrynAndersen]]
52 +>>>>>> What may be going on is that glob2re is already a fairly fast
53 +>>>>>> function, so the overhead of memoizing it with the very generic
54 +>>>>>> `_memoizer` (see its source) swamps the memoization gain. Note
55 +>>>>>> that the few functions memoized with the Memoizer before were much
56 +>>>>>> more expensive, so that little overhead was acceptable then.
57 +>>>>>>
58 +>>>>>> It also may be that Kathryn's patch is slightly faster due to using
59 +>>>>>> the construct `$foo =~ $regexp` rather than `$foo =~ /$regexp/`
60 +>>>>>> (probably avoids a copy or something like that internally) --
61 +>>>>>> this despite checking both `exists` and `defined` on the hash, which
62 +>>>>>> should be reundant AFAICS.
63 +>>>>>>
64 +>>>>>> My guess is that the best of both worlds would be to move
65 +>>>>>> the byhand memoization to glob2re and have it return a compiled
66 +>>>>>> `/^/i` regexp that can be used without further modifiction in most
67 +>>>>>> cases. --[[Joey]]
69 --------------------------------------------------------------
70 Benchmarks done with Devel::Profile on the same testbed IkiWiki setup. I'm just showing the start of the profile output, since that's what's relevant.
76 <!-- 9a7387a53be2b1e182003f3e86cb76d7f10c4b67 -->