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A comment on Back end of Meta Threads is built with Python 3.10 with some interesting tweaks. Parent comment

Re:Back end of Meta Threads is built with Python 3.10 with s... by yuliyp on Thursday July 06, 2023 @05:05PM (#36623037)
Facebook actually does some compile-time optimizations, but also ships some of the profiling data for JITing between early deploy phases and the rest of the fleet: https://engineering.fb.com/2021/03/03/developer-tools/hhvm-j...

Also, Facebook used to do ahead of time compilation (HPHPc) but eventually HHVM managed to outperform it.

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