[Phpwiki-talk] todo, [confirmed] PCRE memory problem at php core found

[Reini U. <ru...@x-...>]

Reini Urban schrieb:

> finally someone found a PCRE memory problem at php core.
> 
> http://viewcvs.php.net/viewcvs.cgi/php-src/NEWS.diff?r1=1.1247.2.724&r2=1.1247.2.714 
> 
> (php-4.3.9RC2)
> 
> Hope this fixes our ConvertOldMarkup problem.
> I'm investigating.

Yes, it was indeed our problem. 4.3.9 or later is recommended.
   http://www.php.net/release_4_3_9.php

It only happens on low memory systems (esp. --with-memory-limit),
and actions which require a lot of memory.
The php GC is no GC, not even their reference counting is reliable.

There are known workarounds (turning off html caching) described at
http://phpwiki.org/KnowBugs

config.ini:
   USECACHE = 0
   WIKIDB_NOCACHE_MARKUP = 1

The system tries to avoid most such issues in broken systems by 
automatically turning on paging with limit=50, when there are more then 
400 pages. But we don't turn off html caching so far automatically. 
you'll see it when you are hit by this problem, and then just turn it off.
There's still some room for improvements memory-wise.
(avoiding meta data and content retrieval, when not requested)

now only a few minor things are left:
   == TODO ==
fix:
* javascript search&replace
* test httpauth, and reported personalpage auth problems
* test against php-5.0.2
* test against apache2
do all unit tests:
   all langs, all db backends, all pages import and export
improvements:
* PageChangeNotification other actions also (rename, remove).
   better subject on create.
* collapse page change notification on LoadAny
* restrict certain action to groups: RawHtml (could be a define)
* db.timeout: force mysql.connect_timeout = 60
* rewrite OldTextFormattingRules, AnciennesR%E8glesDeFormatage
   for proper importing
* test WikiPluginCached support for image maps and svg, swf, eps, ...
   defer header logic
* don't print php notices and warnings as red errors.
   just green or grey
maybe (probably defer):
* iniconfig helpers (create config.ini, installer)
* and and fix more wikilens libs and plugins, layout improvements
* format=rdf and a new owl PageType (similar to InterWikiMap)
   to statically define predicates used by PhpWiki:SemanticWeb
   (semantically enriched links, like interwiki links).
* SqlResult paging
* plugin\WikiAdminSetAclSimple
* plugin\NewUserWelcomePage.php
* plugin\SearchHighlight
* logfile stuff:
*   plugin\RecentReferrers
*   WikiAccessRestrictions
* PageModeration
* SpamAssassinIntegration

already done lately:
* pdf button when an external html2pdf app is defined
   (enabled at PhpWikiDemo)
* enhanced WikiPluginCached (static, ondemand)
* added LdapSearchPlugin

shout now or be quiet until 1.4.0
-- 
Reini Urban
http://xarch.tu-graz.ac.at/home/rurban/