"Profiling live Wikipedia traffic with near-zero overhead"

> Each day of Wikipedia backend traffic yields about 3 million stack trace samples, as collected by Excimer, a new a low-overhead sampling profiler for PHP.

I wrote all about it in this year's Performance Calendar:

👉 calendar.perfplanet.com/2020/p

A collegue of mine ran into this some interesting code behaviour today. I encountered this before, but didn't realize it was still a thing. Fun times!

Can you guess what caused the string to become an integer?

👉 3v4l.org/odIiW

"Impact of using HTTP connection pooling for PHP applications at scale", by Giuseppe Lavagetto (Wikimedia)

- using Envoy,
- backend service's CPU usage went from 2.5 CPU cores to circa 0.8 CPU cores,
- PHP application's latency histogram bucket for <= 100ms went up by 12 percentage points.


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