BOLT Alternatives

BOLT reviews and mentions

• Squeezing a Little More Performance Out of Bytecode Interpreters
  1 project | /r/Compilers | 7 Jun 2023

  Hi Stephen, congrats for the nice work! Have you guys considered using BOLT to optimize the interpreter? what it does is pretty much what has been suggested in this thread: profile + code reordering.

• I didn't find any post-link binary optimizers for Windows executables. Why?
  1 project | /r/optimization | 5 May 2023

  For Linux unstripped ELFs there is the BOLT project (BOLT/bolt at main · facebookincubator/BOLT (github.com)). For PE files I found nothing. I would like to know if there are any or why there are none.

• Why is Rosetta 2 fast?
  5 projects | news.ycombinator.com | 9 Nov 2022
• The Rust compiler is now compiled with (thin) LTO (finally) for 5-10% improvements
  4 projects | /r/rust | 24 Oct 2022

  Google automatically profiles everything running in their datacenters and compiles everything with LTO+PGO on by default. And beyond LTO, both Facebook's BOLT and Google's Propeller can perform additional binary optimizations on top of what regular LTO does.

• Related work on profiling reuse across program versions.
  1 project | /r/Compilers | 18 Oct 2022

  As an example, BOLT (Meta's binary optimizer) uses two strategies to map profiling information from one program onto another. First, it can use the address of branch instructions as anchor points for profiling data. Branches that share the same address (offset from the beginning of the function) can reuse profiling information. Another approach is to use the hashcode formed by the opcodes of instructions in basic blocks as anchor points. As long as the basic block is not modified, BOLT can reuse its profiling data. This approach was described in the paper "Bmat-a binary matching tool for stale profile propagation". If profiling information cannot be mapped onto the new program, then it is said to be stale.

• CFLAGS , LDFLAGS recommendation for making EMACS LIGHTENING FASTER?
  1 project | /r/emacs | 17 May 2022

  If you're just excited to try out some shiny things then you can take a look at https://github.com/facebookincubator/BOLT, which is like PGO AFAIU. But again, in would definitely help if you have some elisp snippet that would measure the performance you care about so that you can see how much things improved after you enable a flag like -O3 or apply a tool like BOLT.

• Bolt - Optimize Linux Image - Has Anyone Tried at Home?
  1 project | /r/archlinux | 16 Jan 2022
• What would it take to get LLVM to align branch targets with memory pages (to double the spatial locality vs. if the targets straddle memory pages)?
  1 project | /r/LLVM | 22 Nov 2021

  The best tool we have for maximizing code locality is probably BOLT. They measure improvements in icache hit ratios.

• AI Benchmark - 11900 Intel Optimized Tensorflow Performance Test
  1 project | /r/hardware | 24 Sep 2021
• AV1 related job offer :O
  2 projects | /r/AV1 | 2 Jan 2021

  Imagine PGO, but taken up a notch: https://github.com/facebookincubator/BOLT

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