{
  "source_revision": "3915732f08eeb342e4093960d2b41a4224aa75d7",
  "device": "Apple M2 Max",
  "os": "macOS 26.6.2 (25G83)",
  "architecture": "arm64",
  "cpu_baseline": "original random-access EF select retained in cpu_ms; forward high-bit cursor with adjacent boundary reuse and popcount skips in cpu_forward_ms; both use production EF output encoder",
  "host_compiler": "Apple clang 21.0.0 (clang-2100.1.1.101)",
  "host_flags": [
    "-std=c++20",
    "-O3",
    "-DNDEBUG",
    "-fobjc-arc"
  ],
  "metal_compiler": "Apple metal 32023.883",
  "metal_flags": [
    "-std=metal3.2",
    "-fno-fast-math"
  ],
  "dxc": "libdxcompiler 1.9 (1-0d3ee6b5) (1.9.0.1)",
  "spirv_tools": "v2026.1, build timestamp 2026-09-12T09:51:08+00:00",
  "spirv_cross": "build timestamp 2026-09-12T05:43:44 (revision string empty)",
  "input_contract": "validated generated files plus explicit sorted due-cancellation ordinals, target identity/count and canceled payload-byte sum",
  "benchmark_command": "prototype kernels.metallib scratch-directory bench",
  "runs": 2,
  "warmups_per_case": 1,
  "measured_repeats_per_benchmark_case": 5,
  "cases_per_run": 86,
  "complete_output_checks": "all outputs compared byte-for-byte with CPU oracle; all passed",
  "correctness": "24 cases pass CTest and host ASan+UBSan with real Metal",
  "host_contention": "main build/regression/package lane explicitly released before measurements; no experiment compilation concurrent with runs",
  "excluded": [
    "logical fixture/cancellation metadata generation",
    "fixture encoding (reported)",
    "mapping/import and initial fixture copying (reported)",
    "pipeline load/compilation (reported separately)",
    "file clipping (reported)",
    "output validation",
    "checksum/content identity",
    "fractional indexes",
    "catalog publication",
    "msync/fsync/durable sealing"
  ],
  "binary_sha256": "5875c7b48712fb67ac2726de867738728dd6506ebd9ef9874f645d3f34d1b3c9",
  "metallib_sha256": "0d2a8551029be9b4357b8c813bf95f8e1809929a583efc9d9528053d0e953311",
  "integration_revision": "5077bbc74cb397d7ca4d5c49561cf28457c3d86c",
  "integration_source_hashes_verified": true,
  "value_profiles": {
    "mixed": "0..512 bytes",
    "tiny": "0..6 bytes",
    "large": "2048..4096 bytes",
    "ff": "16 bytes"
  },
  "repeated_median_margin_criterion": "first tested balanced input size with CPU-forward/GPU median ratio >=1.2 in both runs; sample ranges can overlap, not a latency guarantee"
}