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2019 Sep 12
6
PGO is ineffective for Rust - but why?
Hi everyone,
As part of my work for Mozilla's Low Level Tools team I've
implemented PGO in the Rust compiler. The feature is
available since Rust 1.37 [1]. However, so far we have not
seen any actual performance gains from enabling PGO for
Rust code. Performance even seems to drop 1-3% with PGO
enabled. I wonder why that is and I'm hoping that someone
here might have experience