Tag: Performance

At Wikipedia, we built an efficient sampling profiler for PHP, and use it to instrument live requests. The trace logs and flame graphs are powered by a simple setup that involves only free open-source software, and runs at low infrastructure cost.

This week saw the conclusion of a project I've been shepherding since September of last year. The goal was for the initialisation code for our JavaScript pipeline to fit within a budget of 28 KB.

This post shows how we measure and interpret load times on Wikipedia. It also explains what real-user metrics are, and how percentiles work.