perf(search): skip rayon on small indexes, cache directory distance, add fuzzy search bench - #887
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…add fuzzy search bench
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe change updates fuzzy scoring, path utilities, and match-offset conversion. It also adds Criterion benchmarks for fuzzy search and grep, with repository-backed and synthetic picker modes. ChangesSearch performance
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Refactor Merge Risk: ⚪ Minimal · up to The identified combo-ranking issue predates this change, and the new benchmark command targets the intended package. No merge-blocking issue remains from this review. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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| let current_file = | ||
| std::env::var("FFF_BENCH_CURRENT_FILE").unwrap_or_else(|_| "README.md".into()); | ||
| assert!(picker.base_path().join(¤t_file).is_file()); |
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If FFF_BENCH_PATH points to a valid repository without a root README.md, the default current-file check panics before any query is measured. This unnecessarily prevents benchmarking that repository unless FFF_BENCH_CURRENT_FILE is set.
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Fixed in 27be137: when FFF_BENCH_CURRENT_FILE is unset the bench picks the first indexed file; the existence assert only runs for an explicit override.
| if name == "plain_no_matches" { | ||
| assert!(result.matches.is_empty()); | ||
| } else { | ||
| assert!(!result.matches.is_empty(), "query {name} must match"); | ||
| } |
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If a valid repository lacks one of the fixed positive queries, such as Controller, this assertion panics before its benchmark is registered. Zero matches are a legitimate result, so the assertion prevents using the real-repository benchmark on such repositories.
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Fixed in 27be137: dropped the fixed match-count assertions, only regex_fallback_error is asserted; counts are printed.
| pub(crate) struct DirectoryDistance<'a> { | ||
| components: Components<'a>, | ||
| depth: usize, | ||
| } | ||
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| impl<'a> DirectoryDistance<'a> { | ||
| pub(crate) fn new(current_file: &'a str) -> Self { |
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The new DirectoryDistance utility and its methods appear at the beginning of path_utils.rs. The repository guide requires utility functions to go at the end of the file; this requirement must be satisfied before merging.
Context Used: CLAUDE.md (source)
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Moved DirectoryDistance to the end of the file in 27be137.
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Actionable comments posted: 2
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In `@crates/fff-core/benches/fuzzy_search_bench.rs`:
- Line 11: Update the benchmark’s current-file selection so its default is an
existing file in the indexed repository rather than assuming a root README.md
exists. Validate FFF_BENCH_CURRENT_FILE separately when explicitly set, and keep
the picker.base_path() file check aligned with the selected file.
In `@crates/fff-core/benches/grep_bench.rs`:
- Around line 158-161: Remove the fixed-result assertions on result.matches in
the benchmark loop for plain_no_matches and other queries; repository-backed
datasets may contain or lack the expected literals. Report match counts or
derive expectations from the selected dataset instead.
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📒 Files selected for processing (13)
Makefilecrates/fff-core/Cargo.tomlcrates/fff-core/benches/fuzzy_search_bench.rscrates/fff-core/benches/grep_bench.rscrates/fff-core/benches/support/mod.rscrates/fff-core/src/grep/fuzzy_grep.rscrates/fff-core/src/grep/sink.rscrates/fff-core/src/lib.rscrates/fff-core/src/match_offsets.rscrates/fff-core/src/path_utils.rscrates/fff-core/src/score.rscrates/fff-core/src/simd_path.rscrates/fff-core/src/types.rs
💤 Files with no reviewable changes (1)
- crates/fff-core/src/grep/sink.rs
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fff 0.11.0 dropped bigram columns that appear in few files, so a selective literal (needleBench on the 50k-file bench tree) still opened every file: 0.8 s per grep, all of it blocking the JS thread. Upstream 89c19270 (six commits after v0.11.0: dmtrKovalenko/fff#887, #889, #891) keeps them and the same grep takes ~2 ms. It also fixes the Bun SDK's decoding of scores. Move to 0.11.1 once it is released.
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Scoring-side speedups for
fuzzy_search, plus a criterion bench (make bench-search) that runs against synthetic 1K/10K/100K trees or a real repo viaFFF_BENCH_PATH.What changed
*.rs):rank_by_frecencyranks on a 16-byte(&FileItem, i32)pair and builds the 72-byteScoreonly for the page. Sequential below 32K files — Rayon scheduling dominated on small indexes.ScoreBufferswhen there are ≥8K matches. The sequential fallback-match cursor became a directmatch_idx → fallbacklookup table so order no longer matters.DirectoryDistancepre-parses the current file's components once; the loop caches the penalty byparent_dir_indexso sibling files never recompute it.match_and_score_in_arenais split onconst WITH_CURRENT_FILEso the no-current-file path carries none of those branches.ChunkedString::equals) instead of writing every candidate path into aString.Stringper item;char_indices_to_byte_offsetswalks chars lazily (shared with fuzzy grep viamatch_offsets.rs).merge_byte_offsetsmerges in place; pagination usesskip/take;filename_cowborrows at any offset inside a chunk.Benchmarks
Median of
fuzzy_search,limit: 50,max_threads: 4. Baseline ismainwith this PR's bench harness.linux repo (95,929 files)
mo/ current_filemo/ no_current_filedrivers/net/ current_filedrivers/net/ no_current_filesched core/ current_filesched core/ no_current_filecontroller/ current_filecontroller/ no_current_file*.rssynthetic
mo/ current_filemo/ current_filemo/ current_filemo/ no_current_filecontroller/ current_filesrc/components/ current_fileGrep (
make bench-grep, linux repo) is unchanged within noise; plain/regex grep don't touch any modified code.What's left in a broad query is frizbee itself (~70% of cycles across workers); the serial post-match phase is now mostly the
Vec<Match>flatten insidematch_range_parallel_resolved.Summary by CodeRabbit
bench-searchandbench-grepcommands for running search and grep performance benchmarks.