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[ikiwiki.git] / doc / bugs / editing_gitbranch_template_is_really_slow.mdwn

diff --git a/doc/bugs/editing_gitbranch_template_is_really_slow.mdwn b/doc/bugs/editing_gitbranch_template_is_really_slow.mdwn
index 028a5b2fa57320c4cc25156b9700336743c8e3e5..713dcfa22f9ef6ac4874483e407e38114662d7a7 100644 (file)
--- a/doc/bugs/editing_gitbranch_template_is_really_slow.mdwn
+++ b/doc/bugs/editing_gitbranch_template_is_really_slow.mdwn
@@ -14,4 +14,18 @@ Easy to reproduce offline:
 * `touch templates/gitbranch.mdwn`
 * `/usr/bin/perl -Iblib/lib ikiwiki.in -setup docwiki.setup -refresh`
 
+NYTProf says:
+
+    # spent 279s (237+41.8) within IkiWiki::bestlink which was called 13988949 times, avg 20µs/call:
+    # 13150827 times (222s+37.2s) by IkiWiki::PageSpec::match_link at line 2692, avg 20µs/call
+    # 829606 times (14.9s+4.51s) by IkiWiki::PageSpec::match_link at line 2687, avg 23µs/call
+    ...
+    sub bestlink ($$) {
+
+which is about half the execution time (458s on my laptop).
+
+Adding code to log each call to match_backlink indicates that a large part
+of the problem is that there are about a million calls to
+`bestlink(plugins/goodstuff)` with various pages and locations.
+
 --[[smcv]]