Introduction to PGO

Profile-guided optimization (PGO) is a compiler optimization technology. It collects performance data during program runtime and uses the data during compilation to optimize program performance. PGO requires two compilation processes. During the first compilation, PGO performs application code instrumentation. By running typical cases and services, PGO collects the number of execution times of functions and branches in the application code. During the second compilation, PGO performs further optimization based on the running statistics to generate a high-performance application. FDO technologies, such as PGO, have obvious effects in scenarios with high frontend bound, such as databases and distributed storage. The performance can be improved by 10% to 30%. It effectively reduces computing time and resource consumption, improves application performance, significantly reduces operation costs, and improves user experience.