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Try to enable PGO #25500

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@zamazan4ik

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@zamazan4ik

Title: Enable PGO for Envoy

Description:
Profile-Guided Optimization (PGO) allows gaining additional performance for the software since it uses runtime profile information to perform more advanced optimization during the compilation process. I guess it could be useful for Envoy.

Possible steps:

  • Prepare Envoy build with PGO and bench it compared to the non-PGO Envoy. I expect it will help to boost Envoy performance.
  • At least consider adding PGO to CI. Yes, it has a LOT of caveats like a huge bump in a build time, good profile preparation, profile stability between releases, and much more other stuff but in my opinion, it could be worth it.
  • For some users, who want "cheaply" try to boost their Envoy performance. Maybe will be a good idea to leave a note somewhere in the Envoy documentation about this "advanced" option?

Possible future steps for improving:

  • Try to play with BOLT. BOLT also could help with gaining more performance even from LTO + PGO build (but it's not guaranteed). This way has drawbacks like BOLT on some platforms is too unstable; BOLT could not support some architectures, etc. But it definitely a good tool to think about :)

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