PGO (Profile-Guided Optimisation)

Purpose

Guide agents through the full PGO workflow: instrument build → representative workload → collect profile → optimised build, covering both GCC and Clang, plus BOLT for post-link optimisation.

Triggers

• "How do I use PGO to speed up my binary?"
• "What is profile-guided optimization and when should I use it?"
• "How do I use -fprofile-generate and -fprofile-use?"
• "My -O3 build isn't fast enough — what next?"
• "How does BOLT differ from PGO?"
• "How do I collect representative profile data?"

Workflow

1. When to use PGO