Artifact bab9303056d317a544414bbb7d5aa1e00f7b4d64b03c29e210e94427beed0559:
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. by dmestas on 2026-07-18 16:24:11.
C Merge\sstorage:\sat-rest\sre-deltification\scloses\smost\sof\sthe\scontent-bytes\sgap\n\nfossil-style\sbest-of-N\sdelta\sbase\sselection\s(pickBase,\splan\s§5)\splus\sa\s`zit\spack`\nre-deltification\spass\swith\sa\smonotonic-shrink\sguard\s(§6.1)\sand\ssame-path\ncandidates\s(§6.2).\sAt-rest\sonly:\sall\sfour\sRFCs\sconformant,\swire\sinterop\npreserved,\severy\srepacked\sframe\shash-verified\sagainst\sthe\slog.\n\nMeasured\s(whole-file,\sindex-inclusive):\n\s\ssqlite:\s\s\s\s\s207.3\sMB\s->\s174.4\sMB\s\s\s(1.40x\s->\s1.18x\svs\sfossil\s147.7\sMB)\n\s\sfossil-scm:\s117.5\sMB\s->\s108.1\sMB\s\s\s(1.63x\s->\s1.50x\svs\sfossil\s72.2\sMB)\n\nThe\smonotonic-shrink\sguard\s(keep\sthe\ssmaller\sof\s{existing\sframe,\sre-encoding})\nis\swhat\sturned\sre-deltifying\sa\sclone\sof\sfossil-quality\swire\sdeltas\sinto\sa\snet\nwin\sinstead\sof\sa\s+33%\sregression.
D 2026-07-18T16:24:11.449
F .fossil-settings/ignore-glob 48212e9febe6d74143ee9ac63664d0385fbd2cb43e9877c4c7d86f1faf726292
F README.md 62e1f936cc2ea0e33d717539bdffd6126a639843069bd6256359f2b15cb06232
F build.zig dff8fc88604665ad095e12d3199ca9730fc71c46371e994f040ad8454110c808
F build.zig.zon d5d4d8f8c01f55e69078eabf2ee65f7c1756bdbb2f71738ac5de9de99e69aff1
F docs/plans/bench/baseline-unstamped-run.json 4a5542be70d7b5e6366238b7e4c8d133aff6fd59ae4c40c0984323ea298c1eee
F docs/plans/bench/step2-pickbase-unstamped-run.json 9f4a2f2ff8ca74da80649d5c9d9532e84dde59438b459ad7cf492b6d8f27fc46
F docs/plans/bench/step3-pack-redeltify-unstamped-run.json 3b2c6fca9de70acd5c9f670f0066fff13b196da23a9bdb2ae6e9ad2c36010a83
F docs/plans/bench/step4-samepath-unstamped-run.json 121bdee18b7e5b1b23cd58a05c333b621d3622eb9c2552e9104447e034630cfc
F docs/rfcs/draft-fossil-artifact-format-00.txt a6d542a5effeb41d0ea1e916058ccdc0a5819787f167ef1ebad7814f5680e7ad
F docs/rfcs/draft-fossil-delta-format-00.txt d8025d6d75322e33887c3334a4b9cc729960028b3c994ed01e5a474e4b388fd2
F docs/rfcs/draft-fossil-repo-state-00.txt fd413bcb28001a8a07009ca0c769cfe666394ba79dd4f14a6461f2b592049595
F docs/rfcs/draft-fossil-sync-protocol-00.txt aa55791464a54ef4b651df8780ba5c46e95c723c7997d09a5b727fef658f920a
F src/artifact.zig b099a9c79f207475b2945bb18114e981747975a97bda34a7134cc2f246218a9d
F src/artifact_fuzz.zig 8bb359ddfe790818e109a1dd7ac0c1b5cec1a8fdc556f37e73504cdb7f933e17
F src/artifact_test.zig da999476660f7e6e1f50ed9da5c30f1c83d6b358e2cfcd265c6932959c85bdd1
F src/checkout.zig 339792e01aef607511f0ea33dffad045d3aa0b0981418b4eec8018c9912f3c00
F src/cli.zig 28c119c0cce287421bacf027b06638d1c364739ca6f5836da52e004f7ae5f406
F src/container.zig cef1028531f2763f94248b761c8779a1884e44bb854b8c45617494e3ead40e61
F src/container_test.zig a013652b1ed181161d3ad8fc9d8f052f7c27b61e129662632ceaf8cf189445ec
F src/delta.zig e8f3a6297d47549aea146222732ccf514c39688414f0a74ba396ac91066686f3
F src/delta_fuzz.zig 9e0d8dbb8c82ca0ba1a80974c076e74e4f37072b21a10812efd5539875904719
F src/delta_test.zig b18d97e117dce8fbcc05bff6f6954effdb946bab6d36337efbe5ef64d10646a0
F src/dst.zig 66f7e5b264ded6a4ec82645e87e9780b344ff23360242e263c29415163b25501
F src/e2e.zig d123af6742c79e99a8431e6a3f570e2b886e5473e40a3768e11aa35d315f3447
F src/extras.zig 58a244e750f73b6b0388da6786f45fc829eba88562595cf8e839462f293b4287
F src/fuzz_tests.zig 7194e723225d467cf43d60210bf96860e8c248a7ae63413b70c61ea9349d291d
F src/logstore.zig 6500bdf97f56ed2de104eed894ede81fb8d01f2be4dec48c3f23c88aa1cb719a
F src/logstore_benchmark.zig e245474e1cc4f10617866f718aab3958f13b256c609b3e5fd562f500668388c0
F src/logstore_fuzz.zig 67b7bda806397f92c3b07c94854d9fafca56710090071a1c1c8ec94d137408f8
F src/logstore_test.zig a9baaee2cf009c988832d3632f52a1eeabf36afd52c891315f7673ce28442533
F src/main.zig ac9cef71aabc7caf842c3a58dad31ca6f63d0d91eeccfdbcc25655eb8116b3eb
F src/managed.zig 81ccc2d6321fe3dff91f653305ae4e73bea0b3fae7db2ab2f0cf168d9518d601
F src/merge3.zig d92553dfe5c45059e686d65db0a76e5f94981af5e146fdad75f1fd13b3086b77
F src/pack.zig 0ea96cb540b3f43f6ff8ce95a3044ce939879bc6f9bf0eb82b26aab4089009c7
F src/repocache.zig aae232a6b1b86e27c5242c0ee17ce9f2544299d99cf4936d8c2c9000e3166884
F src/repoimage.zig 7d2dc2f3c145e10e2d9ba6997705fd61a0cc0aedde8e171c253163d1279ccdd5
F src/repository.zig 4e4ee273175ac390949faff6f4b9e2e82a4ab9ce0cee05c5075282682d64f74e
F src/repository_test.zig d18dac567ac27ac464e7cb2e5c84ea7783487473f9bd6d93a1d6c0ef923165a5
F src/repostate.zig 58c08c375994ba47d8a9c1a191f6e82350d545945b667993e09e6d435da8fd06
F src/repostate_test.zig 0333453b73d0c1fdb9e74dccbbdb46d969e66cd1c037acb06d0882b1008c8b3e
F src/repoview.zig ec2958e1e8fd955c761d240ab80c3b3f62e3473991713c25ed5a603df984e403
F src/rfc_vectors/artifact_a1_1_sha1_manifest.txt 82d8fc78b3fbf85efe80cb05e79db40c910bf0551e55b728c6f9c2ca7a42ddb6
F src/rfc_vectors/artifact_a1_2_sha3_technote.txt 832e850f83aab2e2a754aa97591109f7f05fb41e4126c7e71c88a59d6d17e55d
F src/rfc_vectors/artifact_a3_rcard_manifest.txt 47e412ef211f095e93275fadf527909e581eef42357d8437fc7e299bfc3e62a7
F src/rfc_vectors/sync_a1_round1_reply.txt 638813029b10f81303b88859279afb17095d7c779c993f4267870909acabbeb9
F src/rfc_vectors/sync_a1_round2_file_cards.txt 4fa397741f7521cc4181d5d6b04dc143187f57602384eaa688552115ecda27c2
F src/rfc_vectors/sync_a1_round2_reply.txt af956808190c79b37a384041690c36b78845b471d6c6c01d1cced6e3ee92e6b1
F src/rfc_vectors/sync_a2_reply.txt aa130a127cde210f793c7842960083c765e0ffc7b673374fabc8f0edfe03d763
F src/root.zig 6f8922cfe4746eaaf4bc83fb10bb698a43e39746fb070dc8a0cc9fc6e161b83c
F src/serve.zig baa76b81f5cc21322e85f3d390b533c828c969f6d10580b5e8aa1f339202d945
F src/sim/faulty_file.zig 8e8a0325d0e987d1dd306588f910af5302e6456561eefae92c73c424fc1a9c94
F src/sim/gen.zig 0e237af570a73bc78e9a717a8ea59867611deb2348287765826ea4ff1942528b
F src/sim/net.zig 8fb057012ce0a33f67c928cd696bc2761fea8ba4012b2daa33871b2ba5dfe772
F src/sim/oracle.zig 04b81d9472a0529d9e9d030779304c3d6c930f4db20b800ae3f9cbc5c178969a
F src/sim/storage_sweep.zig 5472d632347079fb5c7e7ae300b46c6e8202b91202b1c51b181dd3c7bab8a306
F src/sim/sync_gen.zig 238d46942915b5c0e989dfc738b5927b5228468ea123e6f17b6fb593aa5cbf6e
F src/sim/sync_sweep.zig 5458a84be08823d2d0fc9464665f1c3f3f26563185dc9ae24cf73259faa5d40e
F src/smoke.zig f2565465a36a6c187d49d116f4e671ed843ea6c1a291fcc9c063af29a9baa3c8
F src/storage.zig 512205eb629d5af8d50ad336f1ef49f53b455abd52ee2f9b56d20893cafad39f
F src/storage_benchmark.zig 871f00fef1a34a0b2ee7b9656a217a0cf52949fdd710b642a44dc6bf12d6866e
F src/sync.zig b04119b2679887c6705ed4831899ca1911ca20afe0bac865022ac8b7ad879194
F src/sync_benchmark.zig 9a4542401c880750ff6565a2ca9f1d116341d1c5af704ef4a05c2732eeec8849
F src/sync_driver.zig 722ed498ea6b76900661a085d4257e51f6416d43ac1185e8ac15140de265f67e
F src/sync_driver_test.zig b50450d2938fc60aa90cd9067fc45141a965b63dc2194f42d5109919e380d7df
F src/sync_fuzz.zig 3f419ec3e3c0b4ecf99376e46d111c4fae9826d08f9968e649ffdf84d10f9e61
F src/sync_test.zig b47b05d3defeef61a02c9c9817b66288c48430713737c946734dba151bb17e7e
F src/transport.zig 4652b2ab7f43ccd8af5ca6ef7604f8e7cd28353450b1ec90d206b881308f8b5f
F src/undo.zig b6e44f03b60aac3aff3150e6631d946a12d38c83c0548636dfbf55f0741aa9de
F src/update.zig c3a0f1976249d74b47a4002c3abe97b56ccbd6aedfc3995177c7b70fce09d46a
F src/update_test.zig 4707c7aa7b028976032dbd580c3448bfea11d89660b03c3479c671cb58421f26
F src/warmread_benchmark.zig 9421986d49deff3f720e491fb6d1c7162dc9322f4e67dd14198820c3992dc02a
P c2c837c5e192fd0705defbc80258821b7ff26e6da6e908f967603b8df40843d5 e2a1514213a35ad336b17741f0e018f9e3a316e4c560fa420360c66c04030b02
R ea1f8ad6d40061f64c294204ee880068
U dmestas
Z 28f1b7836fe123d32418420ef3e035e4