rm: safe_remove_dir_recursive_impl' s perf gains 43% by mimalloc (allocation can be improved)

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#11,222 opened on Mar 7, 2026 5 comments 0 reactions 0 assignees View on GitHub

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U - rm

Dominant language: Rust
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Description

https://codspeed.io/uutils/coreutils/branches/oech3%3Anix-ctrlc?utm_source=github&utm_medium=comment-v2&utm_content=button&uri=src%2Fuu%2Frm%2Fbenches%2Frm_bench.rs%3A%3Arm_recursive_tree&runnerMode=Simulation&q=is%3Aimprovement+rm_+recursive_tree

I don't know why, but I want to have it with system allocator.

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First steps

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Research direction

Start with src/uu/rm/benches/rm_bench.rs and the rm_recursive_tree benchmark linked in the issue, then trace safe_remove_dir_recursive_impl. Compare its allocation behavior with the system allocator and the mimalloc result shown by CodSpeed. Done means the intended allocator behavior is established and the recursive-tree benchmark confirms the change without regressions.

Written by the indexing model from the issue text.

Assessment

Tech stack: rust
Domain: cli, performance
Issue type: Refactor
Difficulty: 4/5
Estimated time: 3-5 days
Activity status: Quiet
Clarity: Needs clarification
Newbie friendliness: 38/100

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