Package: python-moinmoin Version: 1.9.3-3~bpo60+1 Severity: important Tags: upstream
We've been experiencing performance problems for a while on wiki.debian.org, which uses moin. Specifically, page saves take a *very* long time, on the order of 90 seconds on a system that is otherwise performing well. I've debugged into this and I've found the problem: the code that works out which users need notifying about page changes. We've currently got 10,686 registered users on wiki.debian.org. strace shows that moin is opening the user data file for every one of those users in turn to check the subscribed_pages array. That takes a long time! I've verified this is the problem - hacking saveText to disable the notification code reduces the page save time from ~90 seconds to ~3 seconds. This is clearly an upstream issue - it's a scalability bug in moin's design. This area needs fixing in some way - maybe add a cache in front of the user lookup here, or store the subscribed_pages information differently. I might be able to help with coding this, but I'd want to see what upstream plans might be first. -- System Information: Debian Release: 6.0.4 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Versions of packages python-moinmoin depends on: ii python 2.6.6-3+squeeze6 interactive high-level object-orie ii python-parsedatetime 0.8.7-2 Python module to parse human-reada ii python-pygments 1.3.1+dfsg-1 syntax highlighting package writte ii python-recaptcha 1.0.5-1+squeeze1 client library for reCAPTCHA and M ii python-werkzeug 0.6.2-1 collection of utilities for WSGI a ii python2.5 2.5.5-11 An interactive high-level object-o ii python2.6 2.6.6-8+b1 An interactive high-level object-o Versions of packages python-moinmoin recommends: ii apache2-mpm-worker [ht 2.2.16-6+squeeze6 Apache HTTP Server - high speed th ii exim4-daemon-light [ma 4.72-6+squeeze2 lightweight Exim MTA (v4) daemon ii fckeditor 1:2.6.6-1 rich text format javascript web ed ii python-xapian 1.2.3-3 Xapian search engine interface for ii python-xappy 0.5-4 easy-to-use interface to the Xapia Versions of packages python-moinmoin suggests: ii antiword 0.37-6 Converts MS Word files to text, PS pn catdoc <none> (no description available) pn cifs-utils <none> (no description available) pn docbook-dsssl <none> (no description available) ii miscfiles [wordlist] 1.4.2.dfsg.1-9 Dictionaries and other interesting ii poppler-utils [xpdf-utils 0.12.4-1.2 PDF utilitites (based on libpopple pn python-4suite-xml <none> (no description available) ii python-docutils 0.7-2 utilities for the documentation of pn python-flup <none> (no description available) pn python-gdchart <none> (no description available) pn python-ldap <none> (no description available) pn python-mysqldb <none> (no description available) pn python-openid <none> (no description available) pn python-pyxmpp <none> (no description available) ii python-tz 2010b-1 Python version of the Olson timezo pn python-xml <none> (no description available) ii wamerican [wordlist] 6-3 American English dictionary words ii wbritish [wordlist] 6-3 British English dictionary words f -- Configuration Files: /etc/moin/mywiki.py changed [not included] -- no debconf information -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
