Claude 8a607b08b9 perf(negentropy): profile NIP-77 reconcile, verify prefix-sum fingerprint fix ...

The 1M relayBench run had geode losing the negentropy phase to strfry
(initial reconcile 6066ms/27r vs 1270ms/14r; identical-set 1947ms vs
557ms). Three layered benchmarks pin where the time actually goes:

- NegentropyReconcileBenchmark (quartz): the kmp-negentropy server loop
  in isolation is ~200ms for the full 14-round exchange — the reconcile
  ALGORITHM is not the bottleneck. (An early version showed 22s/139r;
  that was a benchmark bug — index slices over randomly-sorted ids
  scatter the diff. Real relayBench slices are contiguous time ranges;
  monotonic created_at fixes it and matches strfry's round count.)
- NegentropyServerReconcileBenchmark (geode): the real in-process geode
  server over loopback is 3214ms — 15x the library loop. JFR of the
  server call-trees: ~40% hex/UTF-8/JSON serialization of the payloads,
  ~26% actual reconcile, rest allocation. The gap is the JVM
  constant-factor tax on hex-in-JSON, which strfry pays in C++, not a
  single hotspot.
- NegentropyPrefixFingerprintTest (quartz): the one algorithmic lever.
  Negentropy's fingerprint is an additive sum mod 2^256, so a prefix-sum
  table answers any range in O(1). Proven bit-for-bit identical to the
  library over 2000 random ranges, and 460x faster per call — the fix
  for the ~26% reconcile slice (dominant in the identical-set case).

Not yet wired: the library instantiates FingerprintCalculator
internally, so shipping prefix-sum needs a kmp-negentropy change (or a
quartz-side fast server). Full write-up + artifacts in
quartz/plans/2026-07-04-negentropy-reconcile-profiling.md.

Benchmarks are CI-safe (small defaults / opt-in gates); JFR via
-PnegProfile, scale via -DnegBenchN, geode server bench via
-DnegServerBench=1.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012EZeWww5TJnzBZKPoc6mvU

2026-07-04 05:22:20 +00:00

..

plans

docs(geode): SQLite knobs A/B verdict — no winner, knobs stay off by default

2026-07-04 00:50:37 +00:00

src

perf(negentropy): profile NIP-77 reconcile, verify prefix-sum fingerprint fix

2026-07-04 05:22:20 +00:00

build.gradle.kts

perf(negentropy): profile NIP-77 reconcile, verify prefix-sum fingerprint fix

2026-07-04 05:22:20 +00:00

config.example.toml

fix(geode): validate config knobs and mirror filter at boot

2026-07-04 02:32:35 +00:00