Do fewer passes and generally be more efficient when filtering tests #103689
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Hey! It looks like you've submitted a new PR for the library teams! If this PR contains changes to any Examples of
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thomcc
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Oct 29, 2022
Wonderful. @bors r+ |
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Rollup of 5 pull requests Successful merges: - rust-lang#93582 (Allow `impl Fn() -> impl Trait` in return position) - rust-lang#103560 (Point only to the identifiers in the typo suggestions of shadowed names instead of the entire struct) - rust-lang#103588 (rustdoc: add missing URL redirect) - rust-lang#103689 (Do fewer passes and generally be more efficient when filtering tests) - rust-lang#103740 (rustdoc: remove unnecessary CSS `.search-results { padding-bottom }`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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I do not think so. I glanced at a profile of Miri at the time and saw an oddly large amount of time spent in |
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Do fewer passes and generally be more efficient when filtering tests Follow-on of the work I started with this PR: rust-lang#99939 Basically, the startup code for libtest is really inefficient, but that's not usually a problem because it is distributed in release and workloads are small. But under Miri which can be 100x slower than a debug build, these inefficiencies explode. Most of the diff here is making test filtering single-pass. There are a few other small optimizations as well, but they are more straightforward. With this PR, the startup time of the `iced` tests with `--features=code_asm,mvex` drops from 17 to 2 minutes (I think Miri has gotten slower under this workload since rust-lang#99939). The easiest way to try this out is to set `MIRI_LIB_SRC` to a checkout of this branch when running `cargo +nightly miri test --features=code_asm,mvex`. r? `@thomcc`
Aaron1011
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Jan 6, 2023
Rollup of 5 pull requests Successful merges: - rust-lang#93582 (Allow `impl Fn() -> impl Trait` in return position) - rust-lang#103560 (Point only to the identifiers in the typo suggestions of shadowed names instead of the entire struct) - rust-lang#103588 (rustdoc: add missing URL redirect) - rust-lang#103689 (Do fewer passes and generally be more efficient when filtering tests) - rust-lang#103740 (rustdoc: remove unnecessary CSS `.search-results { padding-bottom }`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Follow-on of the work I started with this PR: #99939
Basically, the startup code for libtest is really inefficient, but that's not usually a problem because it is distributed in release and workloads are small. But under Miri which can be 100x slower than a debug build, these inefficiencies explode.
Most of the diff here is making test filtering single-pass. There are a few other small optimizations as well, but they are more straightforward.
With this PR, the startup time of the
icedtests with--features=code_asm,mvexdrops from 17 to 2 minutes (I think Miri has gotten slower under this workload since #99939). The easiest way to try this out is to setMIRI_LIB_SRCto a checkout of this branch when runningcargo +nightly miri test --features=code_asm,mvex.r? @thomcc