BOLT

BOLT is a post-link optimizer developed to speed up large applications. It achieves the improvements by optimizing application’s code layout based on execution profile gathered by sampling profiler, such as Linux perf tool. An overview of the ideas implemented in BOLT along with a discussion of its potential and current results is available in CGO’19 paper.

User Guides

• Getting Started with BOLT
• Optimizing Clang : A Practical Example of Applying BOLT
• Appendix
• Optimizing Linux Kernel with BOLT
• Code Heatmaps

Reference

• BOLT - a post-link optimizer developed to speed up large applications
• BOLT Profile Formats
• Unsymbolized profiles
• Symbolized profiles
• AArch64 Optimization and Flags Status

Design Documentation

• BOLT Address Translation (BAT)
• Purpose
• Overview
• Usage
• Internals
• BOLT-based binary analysis
• Optimizing binaries with pac-ret hardening
• BOLT ORC-based linker