I profiled the current CVS in single-user mode on my laptop this weekend. I'm not really concerned about any one specific site, just the framework and general behavior. If I can speed that up, I'll have met my goal.
I'm not terribly concerned about the XML, though using XML::DOM is a performance killer. That's mostly during the installation, though, so it's a low priority along the performance axis. The only place it's really used internally in the live system is in the workspacing code, and I don't think there's any of that on Perl Monks at the moment.
Caching is complicated by the fact that the current CVS has subrefs in it. That's why I'm betting my managed-forking approach will have better performance in certain circumstances.
The performance killers, as I see them:
- pages are optimized for writing -- parsing links every time, processing page templates on every hit. This is ameliorated somewhat by code caching in the 1.0 series
- nodelets are cached for the whole site or not at all -- they could be cached per user for a speed improvement
- nodes have a custom inheritance scheme to deal with nodemethods, which was between 10 and 20% of the profiled time in my tests -- this could be reduced further
- inefficient database queries, fetching hashrefs when bound scalars and explicit column names are 20-50% faster -- I'm working on this
- inefficient code -- we're better programmers now
I'm working on all of these, but it's at the tip of CVS. My goal is to make migrating to Everything 1.2 an attractive option for Perl Monks.
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