DevConf.CZ 2019

The 'recorder' library is a small library that replaces your printf or log entries and can turn them into real-time graphs giving you insights into a running application. It started as a way to improve logging, but when confronted with a real project, namely SPICE, it evolved and morphed into something much more interesting.

At first sight, it may seem like it tries to do too many things: logging, tracing, configuring, tweaking, graphing… what else?

Step by step, retracing the evolution of the recorder, this session will show how each feature appeared, why it was indispensable, how a better design emerged under somewhat intense external pressure, and offer more general insights on how software designs crystalize.