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"source": "7b148906263da5ea8aabc5ddb0e2e44ff2288ecc:unimem/specs/README.md",
"source_sha256": "6475bd489d1d3a05f0cadc0dfa66b23fb8ea1dde81c19a8b5f175c40f5f4d01f",
"table_verbatim": "### Measured performance (from experiment)\n\n| Size | Alloc | Write throughput | Read throughput |\n|------|-------|-----------------|----------------|\n| 4 KB | 18 us | 22.8 GB/s | 22.8 GB/s |\n| 1 MB | 15 us | 23.6 GB/s | 23.5 GB/s |\n| 16 MB | 17 us | 23.6 GB/s | 18.9 GB/s |\n| 256 MB | 20 us | 23.1 GB/s | 19.5 GB/s |\n\nThroughput measured with volatile u64, single thread, no SIMD. With NEON/AMX: 60-70+ GB/s expected.\n\n",
"row_verbatim": "| IOSurface: pinned, contiguous VM region, ~20us alloc, ~23 GB/s write | experiments/iosurface_probe |",
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"source_acquisition": "git show 7b148906263da5ea8aabc5ddb0e2e44ff2288ecc:unimem/specs/README.md | complete; hash exact stdout bytes",
"correction": "Previous source_sha256 used direct Nushell command capture, which removed one terminal newline (19370 instead of19371 bytes). Only source metadata changes; both preserved snippets were already exact substrings. Prior JSON retained as historical-snippets-v1.json."
}