Profile-guided optimisation (PGO) is a technique where CPU profile data for an application is collected and fed back into the next compiler build of Go application. The compiler then uses this CPU profile data to optimise the performance of that build by around 2-14% currently (future releases could likely improve this figure further).

In this article, the Grab tech folks show off their wins and learnings, along with the Dockerfile used to make it happen.

https://engineering.grab.com/profile-guided-optimisation

Enjoy!