# facebookarchive/BOLT

Binary Optimization and Layout Tool - A linux command-line utility used for optimizing performance of binaries

Repository: https://github.com/facebookarchive/BOLT
Canonical: https://ross.abutalabs.com/products/facebookarchive-bolt
License Family: other
Archived: true
Last push: 2023-04-24T02:48:15+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3053, "days_push": 1227, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2532, forks 183 (observed 2026-08-28T04:06:58.936318+00:00)

## What it is
BOLT (Binary Optimization and Layout Tool) is a Linux command-line utility that optimizes the performance of native binaries by rearranging code layout post-linking. This archived repository has been merged into the LLVM project, where development continues.

## Use cases
- optimize performance of compiled binaries
- improve instruction cache locality of executables
- reorder code layout after linking
- speed up large C++ applications without recompiling
- profile-guided binary post-link optimization

## When to choose
- you want to optimize an existing binary's code layout without source changes
- you have LBR perf profiles and want faster instruction cache/i-TLB behavior
- you are already in the LLVM ecosystem and can use the maintained bolt in llvm-project

## When to avoid
- you need updates or bug fixes - this repo is frozen and unmaintained
- you target platforms other than Linux x86-64/aarch64 ELF binaries
- you want a general-purpose compiler or linker rather than a post-link optimizer

## Facets
- artifact type: cli-tool
- maturity: abandoned
- function: compiler, developer-tools, benchmarking
- domain: developer-tools, performance, compilers
- platform: cli, cpp
- tags: binary-optimization, post-link-optimizer, llvm, code-layout, archived-repo, linux

## Member repositories
- facebookarchive/BOLT (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:58.936318+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:25:17.936871+00:00, confidence not recorded.
  - readme: https://github.com/facebookarchive/BOLT (fetched 2026-08-28T04:06:58.936318+00:00, sha e201c58fddaf)
- Data as of 2026-08-30T08:39:29.467469+00:00.