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Evaluate using Profile-Guided Optimization (PGO) and LLVM BOLT #305

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zamazan4ik opened this issue Oct 23, 2023 · 0 comments
Open

Evaluate using Profile-Guided Optimization (PGO) and LLVM BOLT #305

zamazan4ik opened this issue Oct 23, 2023 · 0 comments

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@zamazan4ik
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Hi!

Recently I checked Profile-Guided Optimization (PGO) improvements on multiple projects. The results are here. E.g. PGO results for LLVM-related tooling are here. According to the tests, PGO usually helps with the compiler and compiler-like workloads (like static analysis) - e.g. Clang gets +20% compilation speed with PGO. That's why I think trying to optimize the Intel Graphics Compiler (IGC) with PGO can be a good idea.

I can suggest the following action points:

  • Perform PGO benchmarks on IGC. And if it shows improvements - add a note about possible improvements in IGC's performance with PGO.
  • Providing an easier way (e.g. a build option) to build scripts with PGO can be helpful for the end-users and maintainers since they will be able to optimize IGC according to their own workloads.
  • Optimize pre-built binaries with PGO

Testing Post-Link Optimization techniques (like LLVM BOLT) would be interesting too (Clang and Rustc already use BOLT as an addition to PGO) but I recommend starting from the usual PGO.

Here are some examples of how PGO optimization is integrated in other projects:

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