4 ms·

Here's some compile benchmarks from the LLVM update which is the main reason for compile time changes: https://perf.rust-lang.org/compare.html?start=ef9549b6c0

by Macha 5y ago

Here's some compile benchmarks from the LLVM update which is the main reason for compile time changes: https://perf.rust-lang.org/compare.html?start=ef9549b6c0efb7525c9b012148689c8d070f9bc0&end=0983094463497eec22d550dad25576a894687002 https://perf.rust-lang.org/compare.html?start=ef9549b6c0efb7... Some things compile decently faster (~ 10%), some things compile a little faster or slower (~ +/- 3%), some things have a bigger perf hit but not as many as had a bigger perf gain (~ -10%). So it's faster on average but the data is muddy enough that you probably wouldn't stick it front and center on your release notes.

dralley 5y ago
Does anyone know what change was responsible for the big improvement from a few days ago? https://perf.rust-lang.org https://perf.rust-lang.org It's less of a universal improvement than the pass manager, but for most of the benchmarks that it does impact it seems just as large, or larger.
- kzrdude 5y ago
  From the graph, it points out this commit. And from the description, I think it's exactly that commit and not just one close to it. I heard it was a big improvement. https://github.com/rust-lang/rust/commit/63cc2bb https://github.com/rust-lang/rust/commit/63cc2bb > Enable new pass manager with LLVM 13 > https://github.com/rust-lang/rust/pull/88243 https://github.com/rust-lang/rust/pull/88243
  - dralley 5y ago
    I'm talking about the change on the 17th of October, only a couple of days ago, not the one from a month ago which I know (and mentioned) is the new pass manager. The change doesn't show up in all of the graphs, but for the cases where it does show, it's a similar size improvement to the new pass manager. Maybe it was enabling PGO rather than any code change, I've heard it mentioned that happened recently.