[compiletest] Parallelize test discovery by tmandry · Pull Request #140177 · rust-lang/rust (original) (raw)

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Thanks! This is quite a significant improvement even in my local testing. It turns out

Certain filesystems

can even include ReFS on a local Windows dev drive.

Test collection time diff

Measured against 1a5bf12 + naive time recording around top-level collect_tests_from_dir.

x86_64-unknown-linux-gnu (WSL)

x86_64-pc-windows-msvc (PowerShell, native)

Additionally, I ran ./x test ui and ./x test run-make to double-check if the number of runned tests and test outcomes look "expected", which they did.