Flickr Technology

Over here you can find a (slightly outdated) presentation given about Flickr. Apparently it is implemented in PHP 4 using MySQL as a database. Some interesting stats from the presentation:

  • 60,000 lines of PHP4 code
  • 60,000 lines of templates
  • 70 custom smarty functions/modifiers
  • 25,000 DB transactions/second at peak
  • 1000 pages per second at peak

Note these are outdated probably, but it’s nice to know for an indication. Somehow you expect that these kinds of sites use very fancy C++, Java, or whatever languages or frameworks, but that does not have to be the case.

See the presentation here (PDF).