{
  "date": "2026-11-05",
  "engineVersion": "1.0.0",
  "engineCommit": "67adcda76e04b0973e8f02a064b289a704ae7c48",
  "hardware": {
    "cpu": "Apple M4",
    "memoryBytes": 17179869184,
    "os": "macOS 26.5.1",
    "architecture": "arm64"
  },
  "rustc": "rustc 1.97.1 (8bab26f4f 2026-07-14)",
  "build": "cargo run --release --locked -p heather_db --example write_modes",
  "harnessSha256": "3047d08f09deb4678cf9c564f487f32f39d1a7b349b0f09a495a454536bfa264",
  "sourceHashes": {
    "heather_db/src/write.rs": "b6362f8634a866d97f774353f0497aa01d2bc75eb4a8e2d16a517ff3e7fc6a4b",
    "heather_db/src/collection.rs": "c5fd36ae5880cd7fd670df9ff2e90bbe78091078818e4ca016ceffb073cc312b",
    "heather_db/src/store.rs": "82be219446dc46a36350cb197798b6240fab9cd7171b49d90267e5cedbd2b95b",
    "Cargo.lock": "b51ce3ee0a6d004747d5f901e8e29bf99c1f02852d248f397401b8b8332b1df5"
  },
  "method": {
    "dimensions": 128,
    "prefillObservations": 200,
    "prefillMethod": "one write_batch outside timing",
    "precision": "f64",
    "durability": "synchronous LMDB default",
    "mapSizeMiB": 256,
    "measuredPairsPerWorkload": 20,
    "discardedWarmupPairsPerWorkload": 2,
    "input": "StdRng seeded normal unit vectors; same 300 vectors for both modes in each pair",
    "modeOrder": "competitive first on even rounds; plain first on odd rounds",
    "timing": "std::time::Instant around write calls only; input generation, setup, prefill, count inspection and teardown excluded",
    "uncertainty": "10,000 paired bootstrap resamples; percentile 95% intervals for means and ratio of means; seed 20261105; not request p95"
  },
  "scope": "Native vector-only calls on one developer machine, fresh temporary databases per sample. No HTTP, metadata, embeddings, sustained-throughput or large-scale claim. Equal observations do not imply equal location counts: competitive mode can consolidate observations. These are separate measurements from the Criterion suite.",
  "results": [
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      "label": "One vector \u00b7 one call",
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