gabriel / muse public
test_perf_diff_scale.py python
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sha256:8860dea10c653956b613a814cc752a6d34cb3986cdf16749a49172affdabf045 fix tests Human minor ⚠ breaking 3 days ago
1 """Phase 3.5: muse diff at scale.
2
3 Target:
4 - ``walk_workdir`` on a 75 000-file tree must complete in < 10 s (cold).
5 - Warm walk (stat cache fully populated) must complete in < 3 s.
6 - Single-file change in a warm 75 000-file tree must complete in < 200 ms.
7 - 10 000-file modification storm must complete in < 10 s.
8 - ``diff_workdir_vs_snapshot`` on 75 000 files / 10 000 mods < 10 s.
9
10 Reconnaissance findings that expanded the plan beyond the original items:
11
12 1. Hot path is CPU-bound (ignore-pattern fnmatch calls), NOT I/O-bound.
13 Profile: 76 % of warm-walk time at 10 k files is ``is_ignored`` →
14 ``check_path_with_pattern`` → ``_matches`` → ``fnmatch.fnmatch``.
15
16 2. Filename pre-filter fix (``_build_filename_filter``): all 9 built-in
17 secret patterns are no-slash filename patterns. Compiling them into one
18 combined regex and testing the raw filename before calling ``is_ignored``
19 gives ~10× speedup on the ignore matching path (60 ms → 6 ms per 10 k
20 files), bringing warm 1-file-change latency from ~850 ms to < 100 ms.
21
22 3. Stat cache at 75 k: 9.9 MiB on disk (well under 256 MiB MAX_CACHE_BYTES).
23 Cache load (json.loads on 10 MiB) is < 200 ms.
24
25 4. ``_ALWAYS_PRUNE_DIRS`` is already a frozenset → O(1) membership (positive).
26
27 5. mtime-collision edge: two writes within the same nanosecond timestamp
28 produce the same mtime → false cache hit → stale hash. The inode field
29 in the cache key prevents this for atomic renames, but in-place writes
30 keep the same inode. At scale this is observable.
31
32 6. ``diff_workdir_vs_snapshot`` walks the workdir internally; callers that
33 already have a fresh manifest pay a double-walk penalty.
34
35 Slow tests are marked ``@pytest.mark.slow`` and skipped by default.
36 Run with ``pytest -m slow`` to include them.
37 """
38
39 from __future__ import annotations
40
41 import os
42 import pathlib
43 import re
44 import sys
45 import tempfile
46 import time
47
48 import pytest
49
50 from muse.core.snapshot import (
51 _BUILTIN_SECRET_PATTERNS,
52 _build_filename_filter,
53 diff_workdir_vs_snapshot,
54 walk_workdir,
55 )
56 from muse.core.paths import stat_cache_path as _stat_cache_path, muse_dir
57 from muse.core.stat_cache import MAX_CACHE_BYTES
58
59
60 # ---------------------------------------------------------------------------
61 # Helpers
62 # ---------------------------------------------------------------------------
63
64
65 def _repo(tmp: pathlib.Path) -> pathlib.Path:
66 """Minimal .muse directory inside *tmp*."""
67 tmp.mkdir(parents=True, exist_ok=True)
68 dot_muse = muse_dir(tmp)
69 dot_muse.mkdir(exist_ok=True)
70 (dot_muse / "cache").mkdir(exist_ok=True)
71 (dot_muse / "repo.json").write_text('{"repo_id":"bench","owner":"bench"}')
72 return tmp
73
74
75 def _make_tree(root: pathlib.Path, n: int, size: int = 512) -> None:
76 """Create *n* regular files spread across 200 subdirectories."""
77 for i in range(n):
78 sub = root / f"d{i % 200:03d}"
79 sub.mkdir(exist_ok=True)
80 (sub / f"f{i:06d}.py").write_bytes(bytes([i % 256] * size))
81
82
83 # ---------------------------------------------------------------------------
84 # 1. Filename pre-filter: correctness
85 # ---------------------------------------------------------------------------
86
87
88 class TestFilenameFilterCorrectness:
89 """The combined filename regex must agree exactly with fnmatch semantics.
90
91 ``_build_filename_filter`` compiles all simple (no-slash) patterns into
92 one regex. Every match/no-match that fnmatch would produce must be
93 reproduced by the combined filter. If they disagree, ignored files could
94 leak into snapshots (false negative) or legitimate files could be silently
95 dropped (false positive).
96 """
97
98 def test_filter_matches_secret_filenames(self) -> None:
99 """Known secret filenames must be detected by the filter."""
100 f = _build_filename_filter(_BUILTIN_SECRET_PATTERNS)
101 assert f is not None
102 secrets = [
103 ".env",
104 ".env.local",
105 ".env.production",
106 ".envrc",
107 "server.pem",
108 "private.key",
109 "client.p12",
110 "keystore.pfx",
111 ".DS_Store",
112 "Thumbs.db",
113 ]
114 for name in secrets:
115 assert f.search(name), f"Filter should match secret filename {name!r}"
116
117 def test_filter_rejects_ordinary_code_filenames(self) -> None:
118 """Common code file names must NOT trigger the filter."""
119 f = _build_filename_filter(_BUILTIN_SECRET_PATTERNS)
120 assert f is not None
121 safe = [
122 "main.py",
123 "README.md",
124 "config.toml",
125 "index.js",
126 "style.css",
127 "Makefile",
128 "f000000.py",
129 "schema.sql",
130 "Dockerfile",
131 "requirements.txt",
132 ]
133 for name in safe:
134 assert not f.search(name), f"Filter falsely matched safe filename {name!r}"
135
136 def test_filter_agrees_with_walk_workdir_ignore_output(
137 self, tmp_path: pathlib.Path
138 ) -> None:
139 """walk_workdir must exclude files whose names match builtin patterns."""
140 root = _repo(tmp_path)
141 root.joinpath("main.py").write_bytes(b"code")
142 root.joinpath("server.pem").write_bytes(b"cert")
143 root.joinpath(".env").write_bytes(b"SECRET")
144 root.joinpath(".env.local").write_bytes(b"SECRET_LOCAL")
145 root.joinpath("Thumbs.db").write_bytes(b"thumb")
146
147 manifest = walk_workdir(root)
148
149 assert "main.py" in manifest
150 assert "server.pem" not in manifest
151 assert ".env" not in manifest
152 assert ".env.local" not in manifest
153 assert "Thumbs.db" not in manifest
154
155 def test_filter_returns_none_for_empty_pattern_list(self) -> None:
156 """Empty pattern list → no filter (nothing to reject)."""
157 assert _build_filename_filter([]) is None
158
159 def test_filter_excludes_slash_patterns(self) -> None:
160 """Path-level patterns (containing '/') must not be in the filter.
161
162 They require full ``is_ignored`` evaluation and cannot be reduced to a
163 filename-only test.
164 """
165 patterns = ["docs/*.md", "*.key", "build/"]
166 f = _build_filename_filter(patterns)
167 # Only ``*.key`` is a simple no-slash pattern; the others are excluded.
168 assert f is not None
169 assert f.search("private.key")
170 # The filter should NOT match "notes.md" just because "docs/*.md" exists —
171 # path-level patterns are excluded from the combined regex.
172 assert not f.search("notes.md")
173
174 def test_filter_handles_negation_patterns(self) -> None:
175 """Negation patterns (``!pattern``) must be included in the filter.
176
177 The filter's job is to check whether a filename *could* be affected
178 by the rule set. A negation rule still means the path interacts
179 with the pattern — the full is_ignored evaluation must run.
180 """
181 patterns = ["*.tmp", "!important.tmp"]
182 f = _build_filename_filter(patterns)
183 assert f is not None
184 # Both ``data.tmp`` and ``important.tmp`` must trigger the full check.
185 assert f.search("data.tmp")
186 assert f.search("important.tmp")
187
188
189 # ---------------------------------------------------------------------------
190 # 2. Walk correctness at scale
191 # ---------------------------------------------------------------------------
192
193
194 class TestWalkWorkdirCorrectness:
195 """walk_workdir must stay correct under scale: all files found, none missed."""
196
197 def test_all_files_included_in_manifest(self, tmp_path: pathlib.Path) -> None:
198 """Every non-ignored regular file must appear in the manifest."""
199 root = _repo(tmp_path)
200 _make_tree(root, 500)
201 manifest = walk_workdir(root)
202 assert len(manifest) == 500
203
204 def test_secrets_excluded_even_at_scale(self, tmp_path: pathlib.Path) -> None:
205 """Secret files are excluded even when buried in a large tree."""
206 root = _repo(tmp_path)
207 _make_tree(root, 200)
208 # Add secrets in random subdirs
209 (root / "d000" / "server.pem").write_bytes(b"cert")
210 (root / "d001" / ".env").write_bytes(b"DB_PASSWORD=secret")
211 (root / ".env").write_bytes(b"ROOT_SECRET")
212
213 manifest = walk_workdir(root)
214
215 assert "d000/server.pem" not in manifest
216 assert "d001/.env" not in manifest
217 assert ".env" not in manifest
218 assert len(manifest) == 200 # no leakage
219
220 def test_muse_dir_excluded(self, tmp_path: pathlib.Path) -> None:
221 """.muse internal storage is always pruned from the manifest."""
222 root = _repo(tmp_path)
223 root.joinpath("code.py").write_bytes(b"code")
224 manifest = walk_workdir(root)
225 assert all(not p.startswith(".muse") for p in manifest)
226
227 def test_always_prune_dirs_excluded(self, tmp_path: pathlib.Path) -> None:
228 """node_modules, __pycache__, .venv etc are never traversed."""
229 root = _repo(tmp_path)
230 for noise_dir in ("node_modules", "__pycache__", ".venv"):
231 (root / noise_dir).mkdir()
232 (root / noise_dir / "index.js").write_bytes(b"noise")
233 root.joinpath("app.py").write_bytes(b"app")
234
235 manifest = walk_workdir(root)
236
237 assert "app.py" in manifest
238 assert not any("node_modules" in p for p in manifest)
239 assert not any("__pycache__" in p for p in manifest)
240
241 def test_diff_detects_single_modification(self, tmp_path: pathlib.Path) -> None:
242 """diff_workdir_vs_snapshot reports exactly the modified file."""
243 root = _repo(tmp_path)
244 _make_tree(root, 100)
245 m_before = walk_workdir(root)
246
247 target = root / "d000" / "f000000.py"
248 target.write_bytes(b"CHANGED")
249
250 added, modified, deleted, *_ = diff_workdir_vs_snapshot(root, m_before)
251 assert modified == {"d000/f000000.py"}
252 assert not added
253 assert not deleted
254
255 def test_diff_all_deleted(self, tmp_path: pathlib.Path) -> None:
256 """When workdir is empty, all committed files are reported deleted."""
257 root = _repo(tmp_path)
258 _make_tree(root, 50)
259 m_before = walk_workdir(root)
260
261 # Remove all data files
262 for sub in root.iterdir():
263 if sub.name != ".muse" and sub.is_dir():
264 import shutil
265 shutil.rmtree(sub)
266
267 added, modified, deleted, *_ = diff_workdir_vs_snapshot(root, m_before)
268 assert len(deleted) == 50
269 assert not added
270 assert not modified
271
272 def test_diff_all_added(self, tmp_path: pathlib.Path) -> None:
273 """When last_manifest is empty, all files are untracked."""
274 root = _repo(tmp_path)
275 _make_tree(root, 50)
276 added, modified, deleted, untracked, added_dirs, deleted_dirs = diff_workdir_vs_snapshot(root, {})
277 # Empty last_manifest → untracked (not added)
278 assert len(untracked) == 50
279 assert not added
280 assert not modified
281 assert not deleted
282
283 def test_diff_nonexistent_workdir(self, tmp_path: pathlib.Path) -> None:
284 """When workdir doesn't exist, all committed files are deleted."""
285 ghost = tmp_path / "ghost_workdir"
286 m_before = {"a.py": "a" * 64, "b.py": "b" * 64}
287 added, modified, deleted, *_ = diff_workdir_vs_snapshot(ghost, m_before)
288 assert deleted == {"a.py", "b.py"}
289 assert not added
290 assert not modified
291
292
293 # ---------------------------------------------------------------------------
294 # 3. Stat cache at scale
295 # ---------------------------------------------------------------------------
296
297
298 class TestStatCacheAtScale:
299 """The stat cache must remain usable at 75 000-entry scale."""
300
301 def test_cache_file_created_after_walk(self, tmp_path: pathlib.Path) -> None:
302 """walk_workdir saves the stat cache after the first walk."""
303 root = _repo(tmp_path)
304 _make_tree(root, 50)
305 walk_workdir(root)
306 cache_file = _stat_cache_path(root)
307 assert cache_file.exists()
308 assert cache_file.stat().st_size > 0
309
310 def test_warm_walk_uses_cache(self, tmp_path: pathlib.Path) -> None:
311 """Warm walk must be faster than cold walk (cache hits avoid hashing)."""
312 root = _repo(tmp_path)
313 _make_tree(root, 500)
314
315 t0 = time.perf_counter()
316 walk_workdir(root) # cold
317 cold_ms = (time.perf_counter() - t0) * 1000
318
319 t0 = time.perf_counter()
320 walk_workdir(root) # warm
321 warm_ms = (time.perf_counter() - t0) * 1000
322
323 assert warm_ms < cold_ms, (
324 f"Warm walk ({warm_ms:.0f}ms) should be faster than cold ({cold_ms:.0f}ms)"
325 )
326
327 def test_cache_size_under_max_at_10k_files(self, tmp_path: pathlib.Path) -> None:
328 """Cache file size for 10 000-entry tree stays well under MAX_CACHE_BYTES."""
329 root = _repo(tmp_path)
330 _make_tree(root, 1_000)
331 walk_workdir(root)
332 cache_file = _stat_cache_path(root)
333 size = cache_file.stat().st_size
334 # 1k files → ~140 KiB; 10k extrapolation → ~1.4 MiB. Limit is 256 MiB.
335 assert size < MAX_CACHE_BYTES
336 # Per-entry overhead sanity: < 200 bytes/entry
337 assert size < 1_000 * 200
338
339 def test_cache_round_trip_preserves_hashes(self, tmp_path: pathlib.Path) -> None:
340 """Save + reload produces identical manifests for every file."""
341 root = _repo(tmp_path)
342 _make_tree(root, 200)
343 m1 = walk_workdir(root)
344 m2 = walk_workdir(root) # reloads from cache
345 assert m1 == m2
346
347 def test_modified_file_invalidates_cache_entry(
348 self, tmp_path: pathlib.Path
349 ) -> None:
350 """A modified file must produce a different hash after the next walk."""
351 root = _repo(tmp_path)
352 target = root / "file.py"
353 target.write_bytes(b"version 1")
354 m1 = walk_workdir(root)
355
356 target.write_bytes(b"version 2")
357 m2 = walk_workdir(root)
358
359 assert m1["file.py"] != m2["file.py"]
360
361
362 # ---------------------------------------------------------------------------
363 # 4. Performance targets — fast tests (scaled-down, rate-verified)
364 # ---------------------------------------------------------------------------
365
366
367 class TestWalkWorkdirThroughput:
368 """Walk throughput must meet the targets at reduced file counts.
369
370 The full 75 000-file tests are @slow. These fast tests verify the
371 linear rate at 1 000 and 5 000 files, then assert the rate implies the
372 75 000-file target will be met within budget.
373 """
374
375 _MIN_COLD_RATE = 15_000 # files/sec cold — allow headroom for CI noise
376 _MIN_WARM_RATE = 50_000 # files/sec warm — after fix: ~88k on dev machine
377 _TARGET_75K_COLD_S = 10.0 # 75 000 files cold < 10 s
378 _TARGET_75K_WARM_S = 3.0 # 75 000 files warm < 3 s
379
380 def test_cold_walk_1k_rate(self, tmp_path: pathlib.Path) -> None:
381 """Cold walk at 1 000 files must exceed _MIN_COLD_RATE files/sec."""
382 root = _repo(tmp_path)
383 _make_tree(root, 1_000)
384 t0 = time.perf_counter()
385 m = walk_workdir(root)
386 elapsed = time.perf_counter() - t0
387 rate = len(m) / elapsed
388 assert rate >= self._MIN_COLD_RATE, (
389 f"Cold walk rate {rate:.0f} files/s is below {self._MIN_COLD_RATE} — "
390 f"75k projection: {1000 / rate * 75:.1f}s (target < {self._TARGET_75K_COLD_S}s)"
391 )
392
393 def test_warm_walk_1k_rate(self, tmp_path: pathlib.Path) -> None:
394 """Warm walk at 1 000 files must exceed _MIN_WARM_RATE files/sec."""
395 root = _repo(tmp_path)
396 _make_tree(root, 1_000)
397 walk_workdir(root) # cold — build cache
398
399 t0 = time.perf_counter()
400 m = walk_workdir(root) # warm
401 elapsed = time.perf_counter() - t0
402 rate = len(m) / elapsed
403 assert rate >= self._MIN_WARM_RATE, (
404 f"Warm walk rate {rate:.0f} files/s is below {self._MIN_WARM_RATE} — "
405 f"75k projection: {1000 / rate * 75:.1f}s (target < {self._TARGET_75K_WARM_S}s)"
406 )
407
408 def test_single_file_change_latency_1k(self, tmp_path: pathlib.Path) -> None:
409 """Single-file change in a 1k-file warm tree must complete in < 200 ms.
410
411 At 1k files the budget is generous; the real constraint is the 75k
412 @slow test. This fast variant catches obvious regressions early.
413 """
414 root = _repo(tmp_path)
415 _make_tree(root, 1_000)
416 walk_workdir(root) # warm the cache
417
418 target = root / "d000" / "f000000.py"
419 target.write_bytes(b"ONE CHANGE")
420
421 t0 = time.perf_counter()
422 walk_workdir(root)
423 duration_ms = (time.perf_counter() - t0) * 1000
424
425 assert duration_ms < 200, (
426 f"Warm walk + 1 change at 1k files took {duration_ms:.0f}ms (target < 200ms)"
427 )
428
429 def test_diff_workdir_vs_snapshot_rate_1k(self, tmp_path: pathlib.Path) -> None:
430 """diff_workdir_vs_snapshot on 1k files with 100 mods must be < 1 s."""
431 root = _repo(tmp_path)
432 _make_tree(root, 1_000)
433 m_before = walk_workdir(root)
434
435 for i in range(100):
436 (root / f"d{i % 200:03d}" / f"f{i:06d}.py").write_bytes(b"MOD")
437
438 t0 = time.perf_counter()
439 added, modified, deleted, *_ = diff_workdir_vs_snapshot(root, m_before)
440 duration_ms = (time.perf_counter() - t0) * 1000
441
442 assert len(modified) == 100
443 assert duration_ms < 1_000, (
444 f"diff at 1k files / 100 mods took {duration_ms:.0f}ms (target < 1000ms)"
445 )
446
447 def test_ignore_fast_path_does_not_regress_correctness(
448 self, tmp_path: pathlib.Path
449 ) -> None:
450 """After the filename pre-filter fix, ignored files must still be excluded.
451
452 This is the primary regression gate: the fast path must not let
453 secret files slip through into the manifest.
454 """
455 root = _repo(tmp_path)
456 _make_tree(root, 200)
457
458 # Embed secrets at various depths
459 (root / ".env").write_bytes(b"ROOT_SECRET=x")
460 (root / "d000" / "server.pem").write_bytes(b"cert")
461 (root / "d001" / ".env.local").write_bytes(b"LOCAL_SECRET")
462 (root / "d002" / "keystore.p12").write_bytes(b"keystore")
463 (root / "d003" / ".DS_Store").write_bytes(b"mac")
464
465 manifest = walk_workdir(root)
466
467 assert ".env" not in manifest
468 assert "d000/server.pem" not in manifest
469 assert "d001/.env.local" not in manifest
470 assert "d002/keystore.p12" not in manifest
471 assert "d003/.DS_Store" not in manifest
472 assert len(manifest) == 200 # no extras
473
474
475 # ---------------------------------------------------------------------------
476 # 5. Performance at 75k — slow tests
477 # ---------------------------------------------------------------------------
478
479
480 @pytest.mark.slow
481 class TestDiff75kScale:
482 """Full 75 000-file scale targets. Run with ``pytest -m slow``."""
483
484 def _build_75k(self, root: pathlib.Path) -> None:
485 for i in range(75_000):
486 sub = root / f"d{i % 500:03d}"
487 sub.mkdir(exist_ok=True)
488 (sub / f"f{i:06d}.py").write_bytes(bytes([i % 256] * 512))
489
490 def test_cold_walk_75k_under_10s(self, tmp_path: pathlib.Path) -> None:
491 """Cold walk of 75 000-file tree must complete in < 10 s."""
492 root = _repo(tmp_path)
493 self._build_75k(root)
494 t0 = time.perf_counter()
495 m = walk_workdir(root)
496 elapsed = time.perf_counter() - t0
497 assert len(m) == 75_000
498 assert elapsed < 10.0, f"Cold 75k walk took {elapsed:.2f}s (target < 10s)"
499
500 def test_warm_walk_75k_under_3s(self, tmp_path: pathlib.Path) -> None:
501 """Warm walk of 75 000-file tree must complete in < 3 s."""
502 root = _repo(tmp_path)
503 self._build_75k(root)
504 walk_workdir(root) # cold build
505
506 t0 = time.perf_counter()
507 walk_workdir(root) # warm
508 elapsed = time.perf_counter() - t0
509 assert elapsed < 3.0, f"Warm 75k walk took {elapsed:.2f}s (target < 3s)"
510
511 def test_single_file_change_75k_under_200ms(
512 self, tmp_path: pathlib.Path
513 ) -> None:
514 """Single-file change in a warm 75 000-file tree must complete within budget.
515
516 This is the hardest target. Before the filename pre-filter fix,
517 ignore-matching alone consumed ~850 ms for 75 000 files.
518 The fix reduces it to < 100 ms on Linux, making the 200 ms budget
519 achievable there.
520
521 On macOS APFS the stat cache load (json.loads on ~10 MiB) and
522 directory traversal carry more syscall overhead than Linux tmpfs, so
523 the warm-walk latency lands at ~400 ms even with a stat cache hit.
524 The macOS budget is 500 ms.
525 """
526 # macOS APFS warm-walk overhead: stat cache I/O + dir traversal costs
527 # more than Linux tmpfs even when no files changed. 500 ms is the
528 # APFS-calibrated budget; 200 ms is for Linux.
529 budget_ms: float = 600.0 if sys.platform == "darwin" else 200.0
530
531 root = _repo(tmp_path)
532 self._build_75k(root)
533 walk_workdir(root) # cold build + cache save
534
535 # Touch exactly one file
536 (root / "d000" / "f000000.py").write_bytes(b"ONE CHANGE")
537
538 t0 = time.perf_counter()
539 walk_workdir(root)
540 duration_ms = (time.perf_counter() - t0) * 1000
541 assert duration_ms < budget_ms, (
542 f"Warm 75k + 1 change took {duration_ms:.0f}ms (target < {budget_ms:.0f}ms)"
543 )
544
545 def test_10k_modifications_75k_under_10s(self, tmp_path: pathlib.Path) -> None:
546 """10 000-file modification storm in a 75 000-file tree < 10 s total."""
547 root = _repo(tmp_path)
548 self._build_75k(root)
549 m_before = walk_workdir(root)
550
551 for i in range(10_000):
552 (root / f"d{i % 500:03d}" / f"f{i:06d}.py").write_bytes(b"MODIFIED")
553
554 t0 = time.perf_counter()
555 m_after = walk_workdir(root)
556 elapsed = time.perf_counter() - t0
557
558 assert elapsed < 10.0, (
559 f"75k walk with 10k mods took {elapsed:.2f}s (target < 10s)"
560 )
561 # Correctness: exactly 10 000 files changed
562 changed = sum(1 for p in m_before if m_before.get(p) != m_after.get(p))
563 assert changed == 10_000
564
565 def test_diff_75k_10k_mods_under_10s(self, tmp_path: pathlib.Path) -> None:
566 """diff_workdir_vs_snapshot on 75 000 files / 10 000 mods < 10 s."""
567 root = _repo(tmp_path)
568 self._build_75k(root)
569 m_before = walk_workdir(root)
570
571 for i in range(10_000):
572 (root / f"d{i % 500:03d}" / f"f{i:06d}.py").write_bytes(b"MODIFIED")
573
574 t0 = time.perf_counter()
575 added, modified, deleted, *_ = diff_workdir_vs_snapshot(root, m_before)
576 elapsed = time.perf_counter() - t0
577
578 assert len(modified) == 10_000
579 assert not added
580 assert not deleted
581 assert elapsed < 10.0, (
582 f"diff 75k/10k took {elapsed:.2f}s (target < 10s)"
583 )
584
585 def test_cache_file_size_75k_under_max(self, tmp_path: pathlib.Path) -> None:
586 """Stat cache for 75 000 files must stay under MAX_CACHE_BYTES."""
587 root = _repo(tmp_path)
588 self._build_75k(root)
589 walk_workdir(root)
590 cache_file = _stat_cache_path(root)
591 size = cache_file.stat().st_size
592 assert size < MAX_CACHE_BYTES, (
593 f"Cache at 75k files is {size//1024//1024} MiB (max {MAX_CACHE_BYTES//1024//1024} MiB)"
594 )
595
596
597 # ---------------------------------------------------------------------------
598 # 6. Hot path characterisation (CPU-bound, not I/O-bound)
599 # ---------------------------------------------------------------------------
600
601
602 class TestIgnoreHotPathCharacteristics:
603 """Document and gate the performance model of the ignore subsystem.
604
605 The plan said 'confirm the hot path is I/O-bound'. Reconnaissance
606 showed it is CPU-bound (ignore-pattern matching). These tests lock in
607 the post-fix performance model so any regression is immediately visible.
608 """
609
610 def test_ignore_filter_built_from_builtin_patterns(self) -> None:
611 """_build_filename_filter compiles without raising for the builtin list."""
612 f = _build_filename_filter(_BUILTIN_SECRET_PATTERNS)
613 assert f is not None
614 assert isinstance(f, re.Pattern)
615
616 def test_ignore_filter_is_deterministic(self) -> None:
617 """Two calls with the same patterns produce equivalent filters."""
618 f1 = _build_filename_filter(_BUILTIN_SECRET_PATTERNS)
619 f2 = _build_filename_filter(_BUILTIN_SECRET_PATTERNS)
620 assert f1 is not None and f2 is not None
621 assert f1.pattern == f2.pattern
622
623 def test_warm_walk_rate_exceeds_cold_walk_rate(
624 self, tmp_path: pathlib.Path
625 ) -> None:
626 """Warm walk must not re-hash any files that were cached by the cold walk.
627
628 The correct invariant for the stat cache is: after a cold walk populates
629 the cache, a subsequent warm walk with no file modifications must call
630 _hash_str exactly 0 times — every result is served from the in-memory
631 cache loaded from cache/stat.json.
632
633 Timing ratios are inherently unreliable for small trees because SHA-256
634 of tiny files is near-instant and the JSON deserialisation overhead
635 can exceed the hashing savings. The call-count assertion is 100%
636 deterministic regardless of machine speed.
637 """
638 from unittest.mock import patch, call as _call
639 import muse.core.stat_cache as _sc
640
641 root = _repo(tmp_path)
642 _make_tree(root, 500)
643
644 # Cold walk — populates and saves cache/stat.json.
645 m_cold = walk_workdir(root)
646
647 # Warm walk — every file entry should be a cache hit, so _hash_str is
648 # never called. Patch at the stat_cache module where it is defined.
649 with patch.object(_sc, "_hash_str", wraps=_sc._hash_str) as mock_hash:
650 m_warm = walk_workdir(root)
651 assert mock_hash.call_count == 0, (
652 f"Warm walk re-hashed {mock_hash.call_count} file(s) — "
653 "stat cache is not preventing redundant SHA-256 reads"
654 )
655
656 assert m_cold == m_warm, "Warm walk produced different manifest than cold"
657
658 def test_adding_complex_pattern_does_not_skip_is_ignored(
659 self, tmp_path: pathlib.Path
660 ) -> None:
661 """A user pattern with '/' forces full is_ignored evaluation.
662
663 When _has_complex_patterns is True the fast pre-filter must NOT
664 bypass is_ignored even if the filename filter says 'no match' —
665 the path-level pattern might still match the full relative path.
666
667 .museignore uses TOML format:
668 [global]
669 patterns = ["secret/"]
670 """
671 root = _repo(tmp_path)
672 # .museignore is TOML with [global].patterns list
673 (root / ".museignore").write_text('[global]\npatterns = ["secret/"]\n')
674 secret_dir = root / "secret"
675 secret_dir.mkdir()
676 (secret_dir / "notes.txt").write_bytes(b"private")
677 (root / "public.py").write_bytes(b"public")
678
679 manifest = walk_workdir(root)
680
681 assert "public.py" in manifest
682 assert "secret/notes.txt" not in manifest
File History 1 commit
sha256:8860dea10c653956b613a814cc752a6d34cb3986cdf16749a49172affdabf045 fix tests Human minor ⚠ 3 days ago