{
  "date": "2026-09-07",
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  "real_slide": {
    "methodology": {
      "baseline": "ab8959521ff6aea2e9c6fe8462be3ea471eaa4f8",
      "baseline_module": "git HEAD tile_reader.py compiled from temporary file",
      "candidate_source_sha256": "ac4174f63fa09c831418554722d86c9e9ef37dce344ff070a29174204cd17f9a",
      "fixture": "/data/pathology/projects/clement/code/slide2vec/tests/fixtures/input/test-wsi.tif",
      "fixture_bytes": 26700580,
      "backend": "hs2p OpenSlideReader",
      "read_level": 0,
      "region_coordinates": [
        [
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          2048
        ]
      ],
      "region_size_px": 1024,
      "tile_size_px": 256,
      "threads": 1,
      "warmup_calls_per_implementation_per_case": 1,
      "repeats": 5,
      "order": "baseline,current on even repeat; current,baseline on odd repeat",
      "timing_scope": "whole hierarchical collator: real reads, uint8 region packing, splitting, requested tile selection; no model",
      "cache": "warm persistent reader handles and OS file cache; cold storage throughput not measured",
      "python": "3.11.15 (main, Mar  3 2026, 09:26:23) [GCC 11.4.0]",
      "torch": "2.7.1+cu128",
      "platform": "Linux-5.15.0-187-generic-x86_64-with-glibc2.35",
      "thread_environment": {
        "OPENBLAS_NUM_THREADS": "1",
        "OMP_NUM_THREADS": "1"
      },
      "limitations": "Shared host with concurrent workloads. Earlier 4-region 2048px attempt was interrupted during warmup after severe allocation/read delays; no throughput conclusion is drawn for that geometry. Complete model extraction and cold filesystem throughput are not measured."
    },
    "cases": {
      "full": {
        "requested_indices": [
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          1,
          2,
          3,
          4,
          5,
          6,
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          8,
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          10,
          11,
          12,
          13,
          14,
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        ],
        "output_shape": [
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        "exact_indices_and_pixels": true,
        "whole_collator_ms": {
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        "reader_read_ms": {
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        },
        "median_ms": {
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        "speedup": 2.162059268439052
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      "reordered_subset": {
        "requested_indices": [
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        "output_shape": [
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        "exact_indices_and_pixels": true,
        "whole_collator_ms": {
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          "current": [
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        "reader_read_ms": {
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        "median_ms": {
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        "speedup": 2.1493268968829393
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    },
    "large_region_diagnostic": {
      "shape": [
        4,
        3,
        2048,
        2048
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      "open_seconds": 0.019230596022680402,
      "read_seconds": 27.663633228978142,
      "stack_seconds": 0.021312270080670714,
      "contiguous_seconds": 0.05461251107044518,
      "current_unfold_seconds": 0.0356422271579504,
      "advanced_index_seconds": 0.06713819107972085,
      "interpretation": "Single untimed-warmup diagnostic only; faulthandler caught hs2p make_white_canvas numpy.full during 20-second read stall. Host memory pressure full avg60 was about 18.75% before this probe."
    }
  },
  "verification": {
    "supported_hs2p": "4.4.3",
    "tests_passed": 197,
    "fixture_tiles": 474,
    "fixture_feature_shape": [
      474,
      3
    ],
    "fixture_batches": 15,
    "deterministic_csv_parity_cases": 32,
    "additional_benchmark_checksum_test": "passed separately",
    "pretrained_model_inference": "not run",
    "multi_gpu_parity": "not run"
  }
}