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Jeremy Bingham, DailyKos

Learn how Jeremy Bingham's site faced initial challenges, handled MySQL issues, implemented caching strategies, upgraded hardware, and resolved performance issues for efficient web operations.

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Jeremy Bingham, DailyKos

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  1. Jeremy Bingham, DailyKos.com

  2. Initial Problems • Site tipped over way too often • Required intensive administration • Load times needed to be faster

  3. MySQL Issues Table design didn't scale Redesigned tables with more sensible primary keys Lots of MySQL 3.23isms everywhere Re-engineered tables & code to take advantage of new features Had to stop assuming stuff was there for “a good reason”

  4. Caching and proxying • Started off with apache 1.3 as proxy • Cached front page & recent posts to disk every 5 minutes for anonymous readers • Caused problems during the Iowa caucuses when all servers updated their file caches simultaneously. • Memcached • Using since 2006 • Used even more in 2008

  5. Lighttpd as proxy • Spent weekend with K&R • Added memcached support to mod_magnet • Hacked up mod_magnet had issues with flexibility, also did way more than needed • Enter mod_mcpage • Only caches pages, nothing else • Gzips large pages • Works entirely in lighttpd • Greatly lowered stress on servers

  6. Hardware, before • Before: 10 dual Xeons w/ 2GB RAM, 2 dual Operons w/ 8GB RAM & 2 73 GB SCSI disks, image server, memcached server, combined search & SMTP server • Each webhead independent; all updates had to be applied to each server. • Inconvenient, nerve-wracking possibilities for error

  7. Hardware, after • After: 6 quad Xeons w/ 8GB RAM, SATA scratch disks, 2 octocore Xeons w/ 16 GB RAM, 2 73 GB SCSI for / and /tmp, 6x73GB RAID-10 w/ finely tuned XFS for DB files, consolidated image origin/search/SMTP, Xen VM for db backup, CDN for images • Webheads netboot with NFS root, run as cluster • Lower costs, better performance • New webheads pop right in

  8. DK Monthly Traffic, by Year

  9. How It Worked Out • Performance good overall • Unexpected issues w/ the Flash electoral map - 100 mbit switch no one noticed • Webhead load generally between 0.5 and 1.8 • Some slowdowns from ads and the map

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