{
 "date": "2026-10-21",
 "decision": "rejected",
 "change": "hybrid role-sized registered buffers with the directional protocol: dispatch scale-up/scale-out inboxes and combine scale-up inboxes and staging sized for Attention source domains, combine scale-out inbox for FFN domains",
 "native_source_sha256": "aee39731eab027357d0643adbb09c49319e8641d7c3d58cc4a3ae1c81331e2ec",
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  "role small": 715904,
  "union large (capacity 2048, H2048, top-k 8)": 78840320,
  "role large": 40026624
 },
 "correctness": {
  "cross_node": "14/14 pass",
  "single_domain": "full matrix, 8 invalid-route assertions and both ratios pass",
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 },
 "screen": {
  "arms": {
   "afd": {
    "_label": "xq"
   },
   "union_buffers": {
    "_label": "xq",
    "_env": {
     "AFDEP_UNION_BUFFERS": "1"
    }
   },
   "masked": {
    "_label": "xq",
    "role_aware": false
   }
  },
  "passthrough": [
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   "bf16",
   "--routing",
   "random",
   "--hidden",
   "2048",
   "--tokens",
   "1",
   "8",
   "32",
   "128",
   "512",
   "2048",
   "--capacity",
   "2048",
   "--blocks",
   "6",
   "--hybrid",
   "on"
  ],
  "processes": [
   {
    "order": [
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     "union_buffers",
     "masked"
    ],
    "median_us": {
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      "32": 84.09832000732422,
      "128": 104.36783790588379,
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      "32": 82.9363203048706,
      "128": 104.1972017288208,
      "512": 201.62952423095703,
      "2048": 542.6430511474609
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      "32": 103.9353609085083,
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    "median_us": {
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      "512": 203.0448818206787,
      "2048": 543.6327362060547
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   {
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    "median_us": {
     "masked": {
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      "8": 98.2103967666626,
      "32": 104.37088012695312,
      "128": 121.2611198425293,
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     "afd": {
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      "128": 104.72224235534668,
      "512": 203.61160278320312,
      "2048": 542.7112770080566
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     "union_buffers": {
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      "128": 104.25063610076904,
      "512": 201.2614345550537,
      "2048": 542.9543876647949
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   }
  ],
  "table": [
   {
    "tokens": 1,
    "afd": {
     "median_us": 74.101,
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "union_buffers": {
     "median_us": 73.074,
     "geomean_change_pct": -1.366,
     "repeats_faster": 3
    },
    "masked": {
     "median_us": 88.32,
     "geomean_change_pct": 19.052,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 8,
    "afd": {
     "median_us": 82.008,
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "union_buffers": {
     "median_us": 80.389,
     "geomean_change_pct": -1.882,
     "repeats_faster": 3
    },
    "masked": {
     "median_us": 98.23,
     "geomean_change_pct": 19.943,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 32,
    "afd": {
     "median_us": 84.361,
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "union_buffers": {
     "median_us": 82.946,
     "geomean_change_pct": -1.432,
     "repeats_faster": 3
    },
    "masked": {
     "median_us": 104.267,
     "geomean_change_pct": 23.633,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 128,
    "afd": {
     "median_us": 104.722,
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "union_buffers": {
     "median_us": 104.197,
     "geomean_change_pct": -0.691,
     "repeats_faster": 3
    },
    "masked": {
     "median_us": 121.115,
     "geomean_change_pct": 15.559,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 512,
    "afd": {
     "median_us": 203.311,
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "union_buffers": {
     "median_us": 201.63,
     "geomean_change_pct": -0.856,
     "repeats_faster": 3
    },
    "masked": {
     "median_us": 216.377,
     "geomean_change_pct": 6.392,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 2048,
    "afd": {
     "median_us": 542.8,
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "union_buffers": {
     "median_us": 542.643,
     "geomean_change_pct": -0.064,
     "repeats_faster": 2
    },
    "masked": {
     "median_us": 550.821,
     "geomean_change_pct": 1.423,
     "repeats_faster": 0
    }
   }
  ]
 },
 "conclusion": "Registered memory -49%, but the union-buffer control was faster in every repeat up to 512 tokens (one token: 73.07 vs 74.10 us, -1.4%). Latency is the primary objective and the saving is about 39 MB per rank at this capacity, so the change is not shipped."
}