rustc_mir: buffer -Zdump-mir output instead of pestering the kernel constantly. #64344
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…kernel, r=oli-obk rustc_mir: buffer -Zdump-mir output instead of pestering the kernel constantly. This brings `mir-opt` tests from `197s` (over 3 minutes!) to `2.85s`, on my build server. That's a nice speedup of about `69x` and so it definitely fixes rust-lang#58485, for me. It's such a beginner mistake I feel like maybe `clippy` should lint against it? (cc @Manishearth @oli-obk)
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Rollup of 8 pull requests Successful merges: - #63786 (Make `abs`, `wrapping_abs`, `overflowing_abs` const functions) - #63989 (Add Yaah to clippy toolstain notification list) - #64256 (test/c-variadic: Fix patterns on powerpc64) - #64292 (lowering: extend temporary lifetimes around await) - #64311 (lldb: avoid mixing "Hit breakpoint" message with other output.) - #64330 (Clarify E0507 to note Fn/FnMut relationship to borrowing) - #64331 (Changed instant is earlier to instant is later) - #64344 (rustc_mir: buffer -Zdump-mir output instead of pestering the kernel constantly.) Failed merges: r? @ghost
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…mulacrum Use BufWriter for emitting MIR I noticed that `--emit=mir` takes long time on a large crate. rust-lang#64344 seem to have fixed `-Zdump-mir`, but not `--emit=mir`.
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…mulacrum Use BufWriter for emitting MIR I noticed that `--emit=mir` takes long time on a large crate. rust-lang#64344 seem to have fixed `-Zdump-mir`, but not `--emit=mir`.
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…mulacrum Use BufWriter for emitting MIR I noticed that `--emit=mir` takes long time on a large crate. rust-lang#64344 seem to have fixed `-Zdump-mir`, but not `--emit=mir`.
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This brings
mir-opttests from197s(over 3 minutes!) to2.85s, on my build server.That's a nice speedup of about
69xand so it definitely fixes #58485, for me.It's such a beginner mistake I feel like maybe
clippyshould lint against it?(cc @Manishearth @oli-obk)