Optimizing Rust Programs with PGO and BOLT using cargo-pgo

2023/07/28

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The article discusses the use of Profile-guided optimization (PGO) and BOLT in optimizing Rust programs. The author shares their experience in improving the PGO workflow for building the Rust compiler and introduces cargo-pgo, a Cargo subcommand that simplifies the process of optimizing Rust binaries with PGO and BOLT. PGO is a program optimization technique that allows compilers to better optimize code based on real-world workloads. It involves recording program behavior in a profile and using that information to recompile the program. The article explains the steps involved in the PGO workflow and highlights the support for PGO in Rust. However, the author acknowledges that the process can be complex and not as user-friendly as desired. To address this, cargo-pgo automates the PGO process, making it easier for developers to apply PGO to Rust crates. The article provides instructions on installing and using cargo-pgo, which integrates seamlessly with Cargo's subcommand feature. Overall, cargo-pgo offers a frictionless experience for optimizing Rust programs with PGO and BOLT.