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## Summary Move completely off tokio's multi-threaded runtime. We've slowly been making changes to be smarter about scheduling in various places instead of depending on tokio's general purpose work-stealing, notably https://github.com/astral-sh/uv/pull/3627 and https://github.com/astral-sh/uv/pull/4004. We now no longer benefit from the multi-threaded runtime, as we run on all I/O on the main thread. There's one remaining instance of `block_in_place` that can be swapped for `rayon::spawn`. This change is a small performance improvement due to removing some unnecessary overhead of the multi-threaded runtime (e.g. spawning threads), but nothing major. It also removes some noise from profiles. ## Test Plan ``` Benchmark 1: ./target/profiling/uv (resolve-warm) Time (mean ± σ): 14.9 ms ± 0.3 ms [User: 3.0 ms, System: 17.3 ms] Range (min … max): 14.1 ms … 15.8 ms 169 runs Benchmark 2: ./target/profiling/baseline (resolve-warm) Time (mean ± σ): 16.1 ms ± 0.3 ms [User: 3.9 ms, System: 18.7 ms] Range (min … max): 15.1 ms … 17.3 ms 162 runs Summary ./target/profiling/uv (resolve-warm) ran 1.08 ± 0.03 times faster than ./target/profiling/baseline (resolve-warm) ``` |
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