⚡ Bolt: Optimize Levenshtein calculation in CLI - #38
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💡 What:
Modified the `levenshtein` function in `cli/src/main.rs` to take a mutable slice `cache: &mut [usize]` instead of allocating a `Vec` internally. The outer function `suggest_subcommand` now pre-allocates a small 32-element array `[0; 32]` and passes a mutable reference to it. The inner loop also iterates over `.as_bytes()` instead of `.chars()` since the CLI arguments are ASCII strings.
🎯 Why:
The original `levenshtein` function dynamically allocated a `Vec` of sizes up to length + 1 every time it was called. Since it is invoked in a loop against all ~30 CLI subcommands when a user types an unknown command, this triggered ~30 allocations per error.
📊 Measured Improvement:
Measured using 100,000 iterations for processing 3 different typo inputs ("buld", "runn", "docter"):
* Baseline: 1.469s
* Optimized: 464.7ms
* Speedup: ~3.16x faster
Co-authored-by: Tcode-Motion <188012755+Tcode-Motion@users.noreply.github.com>
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💡 What:
Modified the
levenshteinfunction incli/src/main.rsto take a mutable slicecache: &mut [usize]instead of allocating aVecinternally. The outer functionsuggest_subcommandnow pre-allocates a small 32-element array[0; 32]and passes a mutable reference to it. The inner loop also iterates over.as_bytes()instead of.chars()since the CLI arguments are ASCII strings.🎯 Why:
The original
levenshteinfunction dynamically allocated aVecof sizes up to length + 1 every time it was called. Since it is invoked in a loop against all ~30 CLI subcommands when a user types an unknown command, this triggered ~30 allocations per error.📊 Measured Improvement:
Measured using 100,000 iterations for processing 3 different typo inputs ("buld", "runn", "docter"):
PR created automatically by Jules for task 8922143708013747429 started by @Tcode-Motion