zit 0.3.7 makes four read verbs cost what the image already paid for.
grep over a file's history takes a third of a second instead of twenty;
timeline, info NAME, and every read on a cache written by an older
build no longer replay work the image holds. A forge rendering a page from
hundreds of zit info calls sees each one at the process-start floor.
No artifact, tag namespace, or sync message changed.
grep reads each version once
zit grep PATTERN FILE walked every check-in in the store and read the
file's manifest at each, then searched the same blob again and again: on
libspatialite that was 20,937 manifest reads and 19 seconds for 66
distinct versions of one file. It now uses the same touched set annotate
uses to skip check-ins whose record does not list the file, reads the
file's blob once per distinct content hash, and groups the report the way
fossil grep does — one row per version, credited to the oldest check-in
that introduced it, newest first. 272 reads and 0.35 s on the same file;
the version lists match fossil's byte for byte.
timeline opens on the image
timeline opened the repository in full mode and replayed every crosslink
record for one row, though the image has carried adjacency since layout 2
and comment and login since layout 6. It reads the image now: 60 ms to
8 ms on a 22k check-in store. -F full, -v, and -p still read the
manifests they render, through the facade. Output is byte-identical across
every format, pinned by an e2e that renders warm and then from a fresh
derive.
A stale image is rebuilt once
A cache whose image was absent or written at an older layout stayed that way: only a miss stored the cache, and a hit replayed the record body on every open — 58 ms per call on the same store, forever, after any layout bump. A hit that has to replay now rewrites the image from the view it just built, so the fallback is paid once.
info renders Q cards from the state (step 1)
info NAME read and parsed the check-in's manifest for one purpose: the
cherrypick:/backout: provenance line almost no check-in has. The
crosslink record, the state, and the image now carry each check-in's Q
cards — sign and target, the two facts fossil's cherrypick table keeps —
and info reads them there. On libspatialite info NAME went from 16 ms
to 6 ms, level with leaves, with no manifest read. The multi-name form
of info (step 2) is still open on the issue.
Compatibility
- Artifacts, tags, and the sync protocol are unchanged; Fossil RFC revision 00 remains the target.
- The cache format changed: the crosslink record is at format 4 and the image at layout 7. A cache written by 0.3.6 misses once and is rebuilt; nothing needs to be run by hand.
- No command, flag, or output changed.
grep's version order is now fossil's (oldest introducer, newest first); the set of versions is the same.
Qualification
zig build test, e2e, smoke (Fossil interop against a real fossil),
muscle (41 differential steps), git-import-e2e, git-export-e2e, and
dst, plus the three-runner CI battery (macOS ARM64, Linux x86-64, Linux
ARM64). Timings were taken on the libspatialite corpus (24,018 artifacts)
with release builds, medians of 15 runs; grep output was diffed against
fossil grep on the same repository.