{
  "experiment": "FerroFeed Source checkpoint history binding",
  "measured_date": "2026-10-22",
  "candidate_revision": "5d3779fefd15612462a523597f9af8721b2ac921",
  "source_report_path": "docs/evidence/checkpoint-history-160.md",
  "source_report_sha256": "2840c7e5f424c67110d325efe410c5be0cc1118ffdb30d03aecff78c2b4ac134",
  "raw_samples_sha256": "aa46468af7042ac0327bb2f521478d904e52753ea6580f704708fba4fa3d355f",
  "measurement": "Median of seven per-sample aggregate ns/event values for the measured Source implementation; not per-event latency percentiles",
  "provenance": {
    "kernel": "Linux-7.2.10-200.fc44.x86_64-x86_64-with-glibc2.43",
    "rust": "rustc 1.97.1 (8bab26f4f 2026-07-14)\nbinary: rustc\ncommit-hash: 8bab26f4f68e0e26f0bb7960be334d5b520ea452\ncommit-date: 2026-07-14\nhost: x86_64-unknown-linux-gnu\nrelease: 1.97.1\nLLVM version: 22.1.6\n",
    "cpu": "Intel Core i9-10920X, CPU 2 pinned, SMT sibling CPU 14, no SHA-NI",
    "storage": "repository target on disk; small captured log repeatedly read with warm page cache",
    "converter_commit": "d02835e992151eb21ac4beb766d0b5b64fc7254d",
    "converter_sha256": "145947686bd21941b37bd3eb10a525d37d9bf5c085eb0cb4a812d597725bf257",
    "benchmark_binary_sha256": "04d42dc5d5fa59b9a0ee006dc8390f94f54c9a865ae18753bd586a134a98f581",
    "input_sha256": {
      "fixtures/databento/opra-spy-20261005.cbbo-1s.dbn.zst": "2b8aed63f1e3f6213eb0c86c83956e0ed536292ac7c8317684c0295ddc54ce47",
      "fixtures/databento/opra-spy-20261005.definition.dbn.zst": "2567f4340df1a179c0b107d00297bbd5badbbc02b922e3caa5b68f1b9a9195dd",
      "fixtures/databento/opra-spy-20261005.tcbbo.dbn.zst": "3c978a60b902b06b1cc9deaa2ad44036a91d9562c583c9709be933b5655a650f"
    },
    "events": 1183,
    "scope": "small captured 0DTE OPRA sample, not whole expiry or live qualification",
    "rustflags": "",
    "implementation_sha256": {
      "crates/ferro-feed-source/src/lib.rs": "f25f6da420a455b4389ed4057ebbdfe9378d2ab7338f79da1300f8151eadd851",
      "crates/ferro-feed-source/src/checkpoint_format.rs": "62ffe15ac3e45671f6a6bce916f63ec5bd5bdbdb8538934d498fab80a5983f36",
      "crates/ferro-feed-source/src/tests.rs": "f3b5e4a76171e52952098e782e1d334fb6a374539b926c606626514c5a9d925a",
      "Cargo.lock": "88933a0672e9b861da9ad8215f563611d9a843f9f08303fee41042c2425fb08d"
    }
  },
  "summary_ns_per_event": {
    "1": {
      "delivery_ns": 868.1138672865596,
      "resume_ns": 596.5105477599324
    },
    "64": {
      "delivery_ns": 594.5711259509721,
      "resume_ns": 596.9770904480135
    },
    "1024": {
      "delivery_ns": 589.9932831783601,
      "resume_ns": 596.1304125105663
    }
  },
  "samples": [
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1,
      "delivery_ns": 1031836850,
      "resume_ns": 709225821,
      "version": "candidate",
      "repetition": 0
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1,
      "delivery_ns": 1021130578,
      "resume_ns": 700545906,
      "version": "candidate",
      "repetition": 1
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1,
      "delivery_ns": 1026978705,
      "resume_ns": 705671978,
      "version": "candidate",
      "repetition": 2
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1,
      "delivery_ns": 1024690395,
      "resume_ns": 704082572,
      "version": "candidate",
      "repetition": 3
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1,
      "delivery_ns": 1019123243,
      "resume_ns": 699259650,
      "version": "candidate",
      "repetition": 4
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1,
      "delivery_ns": 1029219699,
      "resume_ns": 706944848,
      "version": "candidate",
      "repetition": 5
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1,
      "delivery_ns": 1028638393,
      "resume_ns": 707429417,
      "version": "candidate",
      "repetition": 6
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 64,
      "delivery_ns": 708405382,
      "resume_ns": 710843736,
      "version": "candidate",
      "repetition": 0
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 64,
      "delivery_ns": 706787232,
      "resume_ns": 709233394,
      "version": "candidate",
      "repetition": 1
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 64,
      "delivery_ns": 703377642,
      "resume_ns": 706223898,
      "version": "candidate",
      "repetition": 2
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 64,
      "delivery_ns": 702417530,
      "resume_ns": 704064598,
      "version": "candidate",
      "repetition": 3
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 64,
      "delivery_ns": 707496043,
      "resume_ns": 709424933,
      "version": "candidate",
      "repetition": 4
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 64,
      "delivery_ns": 698721403,
      "resume_ns": 700779265,
      "version": "candidate",
      "repetition": 5
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 64,
      "delivery_ns": 702111795,
      "resume_ns": 703869670,
      "version": "candidate",
      "repetition": 6
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1024,
      "delivery_ns": 692743704,
      "resume_ns": 700004887,
      "version": "candidate",
      "repetition": 0
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1024,
      "delivery_ns": 699465548,
      "resume_ns": 705481262,
      "version": "candidate",
      "repetition": 1
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1024,
      "delivery_ns": 696962992,
      "resume_ns": 703347983,
      "version": "candidate",
      "repetition": 2
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1024,
      "delivery_ns": 699917368,
      "resume_ns": 707065080,
      "version": "candidate",
      "repetition": 3
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1024,
      "delivery_ns": 700884274,
      "resume_ns": 708306313,
      "version": "candidate",
      "repetition": 4
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1024,
      "delivery_ns": 697962054,
      "resume_ns": 705222278,
      "version": "candidate",
      "repetition": 5
    },
    {
      "iterations": 1000,
      "events_per_iteration": 1183,
      "batch": 1024,
      "delivery_ns": 696814088,
      "resume_ns": 703719620,
      "version": "candidate",
      "repetition": 6
    }
  ],
  "limitations": [
    "Candidate Source reader only; not full strategy or whole-expiry qualification",
    "Small captured OPRA sample, warm page cache, no SHA-NI",
    "No licensed market records included",
    "No end-to-end latency percentile or live deadline claim"
  ],
  "source_sample_selection": "version = candidate"
}