Questions answered by this recipe
- How do I make my wiki run faster?
Tips for improving your wiki's performance.
PmWiki is quite fast for most setups and needs, however some customizations can slow performance:
- Anything that reads pages from disk slows the processing - e.g. Conditional Markup, Markup Expressions, or Custom Markup that calls the functions PageVar, ReadPage, RetrieveAuthPage, PageTextVar, CondAuth...
- PageLists can slow performance. For example, a menu/sidebar with a static bullet list is much faster than a menu populated dynamically by a pagelist -- and as a menu doesn't change often, it is usually better to update it by hand.
- Adding a group=Main or a name=Main.*-Talk filter to a pagelist speeds it up.
- A dynamic wiki trail from a pagelist is slower than a normal Wiki Trail, same as the menus.
$EnablePageListProtect= 0; speeds significantly pagelists. Look at the docs though, before setting this: PagelistVariables
- Including other pages and PTVs from other pages require opening the disk files of the other pages -- so use sparingly.
- If you don't often change a site header/footer, it will be faster to have the content in the skin template instead of in wiki pages.
- Some recipes such as realtime visitor counters read and write to disk files on every page view -- that could be significantly slower.
- If a recipe manipulates session data, a session file is read/written. Reading a file takes time, writing to a file usually takes much more time.
- Using too many recipes requires opening all their cookbook *.php files, which adds some milli-seconds.
- Using Rewrite Rules/CleanUrls is slightly slower than not using it.
$EnableIMSCaching= 1; makes everything faster, in the period between one edit and another edit (in the whole wiki) -- so if you have such long periods and many visitors between them, it may be useful.
- Loading external content - for example inline RSS feeds, Flickr/Twitter updates, Weather, Maps etc. -- is slower unless the recipe caches the remote data for a while and displays the cached version to many visitors.
- PmWiki on PHP 5 runs noticeably faster than on PHP 4.
- There are recipes (FastCache...) which speed the processing and the wiki should run faster for non-logged-in visitors.
- The SQLite PageStore recipe was reported to dramatically speed up a wiki including pagelists. It is very likely faster - but as of this writing (Feburary 2010) it's not yet tested on a wiki with hundreds of pages, hundreds of visitors a day and many editors, so consider it experimental.
If you run a dedicated hardware server and have some expertise (or can afford to hire an expert), you can do even more optimizations:
- Use a local hard disk rather than network storage.
- Use a faster filesystem such as Reiser4 or a less-CPU-intensive one such as JFS.
- Use fast SSD hard-disks -- even a Flash memory card with the program files could improve speeds (only use for limited, rarely modified files, not for wiki.d or uploads; needs testing - speed could also be worse).
- Use not Apache but a smaller/faster http server such as Nginx.
- Use PHP with FastCGI.
- Use a PHP cache such as APC. (See http://en.wikipedia.org/wiki/PHP_accelerator.)
- Copy all the program files, skins, css... into the RAM of the server and run the wiki from there.
- This page was started after this post by Petko (5ko [snail] 5ko [period] fr).
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