Tag: Wikipedia

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Profiling PHP in production at scale

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.

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Wikipedia's JavaScript initialisation on a budget

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.

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Measuring Wikipedia page load times

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

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