Accelerate large-scale applications with BOLT
Jun 19, 2018Maxim Panchenko
Summary
Introduced BOLT, a binary optimization and layout tool that addresses instruction starvation by optimizing instruction placement in memory. BOLT reconstructs control flow graphs, uses LLVM's MCInst format, and supports Linux binaries (x86-64, AArch64). It leverages sample-based profiling from Linux `perf` tool. BOLT achieved 3-8% performance improvement on HHVM and 2-15% for other services, by isolating frequently executed code and optimizing for hardware features like macro-fusion. BOLT also performs advanced jump table placement, identical code folding, PLT optimization, and constant load elimination.
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