Here are the slides of an internal presentation at Dailymotion. This is an introduction to SystemTap and our usage of it. It was quite instrumental to improve the performance of the website by finding various bottlenecks in production. I did publish a cookbook containing various scripts, including the distribution of response times for PHP requests with the top offenders, and the distribution of client cookie sizes. The cookbook is compiling Jinja templates to build SystemTap scripts. I never blogged about it but, at the time, this was quite innovative.