| # pgo_tools |
| |
| This directory contains scripts used to generate and vet PGO profiles for LLVM. |
| |
| If you're a Mage who wants to generate a new PGO profile for the llvm-next |
| release, `./generate_llvm_next_pgo.py` is what you should run **outside of a |
| chroot**. It will create a new chroot, and generate a profile that's |
| backwards-compatible with our bootstrap chroot toolchains. This script takes a |
| few dozen minutes, and prints an "upload PGO profile" command at the end. |
| |
| If you're a user who wants to generate a bespoke PGO profile for LLVM, |
| `./generate_pgo_profile.py` is what you want. Run it **inside of a chroot**, and |
| it will generate a profile for you with a pretty comprehensive, predefined |
| workload (building absl's tests for arm32, arm64, and a few x86_64 configs). |
| |
| If you want to compare the rough performance of PGO profiles, |
| `./benchmark_pgo_profiles.py` may be useful. |
