Artifact Description [6500bdf97f]

Artifact 6500bdf97f56ed2de104eed894ede81fb8d01f2be4dec48c3f23c88aa1cb719a:

• File src/logstore.zig
  • 2026-07-18 15:09:17 — part of check-in [0375766879] on branch storage — feat(§6.2): same-path candidates in pack via manifest walk

    Same-path predecessors sourced from check-in manifest walk, offered ahead of chronological window candidates (fossil's mlink analog per §6.2).

    fossil-scm-clone: zit=108143984B fossil=72245248B ratio=1.4969 [Step-4 packed store (measured this run), accounting EXACT (header64 + zlib + delta + config == 108,143,984): zlib 8369 frames / 82,268,624 B (76.1%, avg 9830 B); delta 59130 frames / 25,875,208 B (23.9%, avg 437 B); config 1 frame / 88 B; raw 0. Artifact-type split: checkin/manifest 20848 / 23,816,728 B (22.0%), other-artifact 6929 / 4,706,432 B (4.4%), file-blob 39722 / 79,620,672 B (73.6%). Header+padding overhead 3,710,123 B (3.4%).] | sqlite: zit=174352688B fossil=147709952B ratio=1.1804 [Step-4 packed store (measured this run), accounting EXACT (header64 + zlib + delta + config == 174,352,688): zlib 9248 frames / 113,074,896 B (64.9%, avg 12226 B); delta 121746 frames / 61,277,640 B (35.1%, avg 503 B); config 1 frame / 88 B; raw 0. Artifact-type split: checkin/manifest 36515 / 65,427,440 B (37.5%), other-artifact 4775 / 5,462,856 B (3.1%), file-blob 89704 / 103,462,240 B (59.3%). Header+padding overhead 7,211,093 B (4.1%).] vs baseline: fossil-scm-clone: zit=117528088B fossil=72245248B ratio=1.627 [raw=0B/0f; zlib=92073728B/9647f (78.3%); delta=25454120B/57852f (21.7%); config=176B/2f. Header+padding overhead 3711845B (3.2%). Artifact-type: checkin/manifest 26721968B/20848, other 4835264B/6929, file-blob 85970616B/39722. Accounting exact.] | sqlite: zit=207344544B fossil=147709952B ratio=1.404 [raw=0B/0f; zlib=140422768B/10847f (67.7%); delta=66921536B/120147f (32.3%); config=176B/2f. Header+padding overhead 7212808B (3.5%). Artifact-type: checkin/manifest 81006048B/36515, other 5531960B/4775, file-blob 120806296B/89704. Accounting exact.] (user: dmestas, size: 125361) [annotate] [blame] [check-ins using]

  • 2026-07-18 16:24:11 — part of check-in [bab9303056] on branch trunk — Merge storage: at-rest re-deltification closes most of the content-bytes gap

    fossil-style best-of-N delta base selection (pickBase, plan §5) plus a `zit pack` re-deltification pass with a monotonic-shrink guard (§6.1) and same-path candidates (§6.2). At-rest only: all four RFCs conformant, wire interop preserved, every repacked frame hash-verified against the log.

    Measured (whole-file, index-inclusive): sqlite: 207.3 MB -> 174.4 MB (1.40x -> 1.18x vs fossil 147.7 MB) fossil-scm: 117.5 MB -> 108.1 MB (1.63x -> 1.50x vs fossil 72.2 MB)

    The monotonic-shrink guard (keep the smaller of {existing frame, re-encoding}) is what turned re-deltifying a clone of fossil-quality wire deltas into a net win instead of a +33% regression. (user: dmestas, size: 125361) [annotate] [blame] [check-ins using]