Using Datadog APM to improve the performance of Homebrew | Datadog

What this post added

This post details the application of Datadog APM to diagnose performance issues in Homebrew's `brew linkage` command. It describes the instrumentation process using the `ddtrace` gem, the identification of `LinkageChecker::check_dylibs` as the bottleneck, and the implementation and performance evaluation of two caching strategies: SQLite3 and `pstore`. The SQLite3 implementation achieved a performance improvement from 11.5 seconds to 182 milliseconds for 106 packages.