{
 "date": "2026-10-21",
 "change": "Directional hybrid dispatch skips the entry grid sync on Attention domains, which run neither barrier half there",
 "native_source_sha256": "55edaa30bb44b6a8200661505b27a9696172e4314b4534e793016b16446dda6c",
 "commit": "4971830",
 "screen": {
  "topology": "2 waldorf nodes (gf49e9c FFN, gf48cf2 Attention) x 2 NVIDIA H200, InfiniBand GIN",
  "arms": {
   "afd": {
    "_label": "c4"
   },
   "sync": {
    "_label": "c4",
    "_env": {
     "AFDEP_ATTENTION_GRID_SYNC": "1"
    }
   }
  },
  "passthrough": [
   "--payload",
   "bf16",
   "--routing",
   "random",
   "--hidden",
   "2048",
   "--tokens",
   "1",
   "8",
   "32",
   "128",
   "512",
   "2048",
   "--capacity",
   "2048",
   "--hybrid",
   "on",
   "--warmup",
   "50",
   "--iterations",
   "200",
   "--blocks",
   "2"
  ],
  "metric": "per block: max Attention-rank CUDA-event us per exchange; 3 fresh two-pod processes per arm, rotating order",
  "table": [
   {
    "tokens": 1,
    "afd": {
     "median_us": 70.69015979766846,
     "paired_change_pct": [
      0.0,
      0.0,
      0.0
     ],
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "sync": {
     "median_us": 70.99672079086304,
     "paired_change_pct": [
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      0.5997914050464015,
      0.43366855312256813
     ],
     "geomean_change_pct": 0.434235003985739,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 8,
    "afd": {
     "median_us": 78.1719183921814,
     "paired_change_pct": [
      0.0,
      0.0,
      0.0
     ],
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "sync": {
     "median_us": 79.17903900146484,
     "paired_change_pct": [
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      1.219413601480257
     ],
     "geomean_change_pct": 1.2565969813494116,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 32,
    "afd": {
     "median_us": 81.16903781890869,
     "paired_change_pct": [
      0.0,
      0.0,
      0.0
     ],
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "sync": {
     "median_us": 82.1064805984497,
     "paired_change_pct": [
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     "geomean_change_pct": 1.0836521889979966,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 128,
    "afd": {
     "median_us": 102.61183738708496,
     "paired_change_pct": [
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     ],
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "sync": {
     "median_us": 103.45320224761963,
     "paired_change_pct": [
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     "geomean_change_pct": 0.7199846715467695,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 512,
    "afd": {
     "median_us": 199.57056045532227,
     "paired_change_pct": [
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      0.0,
      0.0
     ],
     "geomean_change_pct": 0.0,
     "repeats_faster": 0
    },
    "sync": {
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     "paired_change_pct": [
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     "geomean_change_pct": 0.6181132621983387,
     "repeats_faster": 0
    }
   },
   {
    "tokens": 2048,
    "afd": {
     "median_us": 539.3056869506836,
     "paired_change_pct": [
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     "geomean_change_pct": 0.0,
     "repeats_faster": 0
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     "median_us": 538.8816833496094,
     "paired_change_pct": [
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      0.03293841578435597,
      -0.1584848817021034
     ],
     "geomean_change_pct": -0.05309511768534225,
     "repeats_faster": 2
    }
   }
  ],
  "processes": [
   {
    "order": [
     "afd",
     "sync"
    ],
    "median_us": {
     "afd": {
      "1": 70.43751955032349,
      "8": 78.37415933609009,
      "32": 81.16096019744873,
      "128": 102.61183738708496,
      "512": 199.35879707336426,
      "2048": 539.3056869506836
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     "sync": {
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      "8": 79.17903900146484,
      "32": 82.26255893707275,
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      "512": 201.17352485656738,
      "2048": 539.1242408752441
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    }
   },
   {
    "order": [
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     "afd"
    ],
    "median_us": {
     "sync": {
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      "8": 79.36327934265137,
      "32": 82.1064805984497,
      "128": 103.45320224761963,
      "512": 200.75984001159668,
      "2048": 538.8816833496094
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     "afd": {
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      "32": 81.16903781890869,
      "128": 102.59736061096191,
      "512": 199.88296508789062,
      "2048": 538.7042427062988
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    }
   },
   {
    "order": [
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    ],
    "median_us": {
     "afd": {
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      "8": 78.1489610671997,
      "32": 81.40480041503906,
      "128": 102.83336162567139,
      "512": 199.57056045532227,
      "2048": 539.4039154052734
     },
     "sync": {
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      "8": 79.10192012786865,
      "32": 82.00695991516113,
      "128": 103.11824321746826,
      "512": 200.58040618896484,
      "2048": 538.5490417480469
     }
    }
   }
  ],
  "native_source_sha256": {
   "afd": "55edaa30bb44b6a8200661505b27a9696172e4314b4534e793016b16446dda6c",
   "sync": "55edaa30bb44b6a8200661505b27a9696172e4314b4534e793016b16446dda6c"
  }
 },
 "correctness": {
  "cross_node": {
   "result": "14/14 cross-node cases pass",
   "summary": [
    "bf16-hyb-small: afdep-v21-xa exit=0 afdep-v21-xb exit=0 ",
    "bf16-hyb-large: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "bf16-direct-small: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "bf16-direct-large: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "bf16-generic: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "fp8-hyb-small: afdep-v21-xa exit=0 afdep-v21-xb exit=0 ",
    "fp8-hyb-large: afdep-v21-xa exit=0 afdep-v21-xb exit=0 ",
    "fp8-direct-small: afdep-v21-xa exit=0 afdep-v21-xb exit=0 ",
    "fp8-direct-large: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "fp8-generic: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "f1-hyb-small: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "f3-hyb-small: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "f1-hyb-large: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "f3-hyb-large: afdep-v21-xb exit=0 afdep-v21-xa exit=0 ",
    "done"
   ],
   "logs": [
    {
     "pod": "afdep-v21-xa",
     "log": "c4m-bf16-direct-large-n0.log",
     "log_sha256": "83e5c2803c55429098a76057d4bb379ed3bf4756da24ce86bd904b011c9bf660"
    },
    {
     "pod": "afdep-v21-xa",
     "log": "c4m-bf16-direct-small-n0.log",
     "log_sha256": "e94f40ecd84cfd63153ac5c0219c1d864b259790222c0484941de02aaba55de1"
    },
    {
     "pod": "afdep-v21-xa",
     "log": "c4m-bf16-generic-n0.log",
     "log_sha256": "d0f6dd5e5d04965c9e0824b34f894261d24df458e306405dbcdbe295a7c22073"
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    {
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     "log": "c4m-bf16-hyb-large-n0.log",
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     "log_sha256": "b47ac173de99f750028809fb7eaea4816b9c8c9251e718be4f36d524a1868058"
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     "log_sha256": "9777317877f3fecc8e57034edde65fba4568cb66a186d32d3e18979bfcab7f2f"
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    {
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    },
    {
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     "log_sha256": "044225a4ac6aa9c88f1997adf1e146d4fff7eb33bcdcff4d4cde7da74594da08"
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    {
     "pod": "afdep-v21-xb",
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    },
    {
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     "log": "c4m-bf16-direct-small-n1.log",
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    },
    {
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    {
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     "log": "c4m-bf16-hyb-large-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
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    },
    {
     "pod": "afdep-v21-xb",
     "log": "c4m-f1-hyb-large-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
     "pod": "afdep-v21-xb",
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     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
     "pod": "afdep-v21-xb",
     "log": "c4m-f3-hyb-large-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
     "pod": "afdep-v21-xb",
     "log": "c4m-f3-hyb-small-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
     "pod": "afdep-v21-xb",
     "log": "c4m-fp8-direct-large-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
     "pod": "afdep-v21-xb",
     "log": "c4m-fp8-direct-small-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
     "pod": "afdep-v21-xb",
     "log": "c4m-fp8-generic-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
     "pod": "afdep-v21-xb",
     "log": "c4m-fp8-hyb-large-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    },
    {
     "pod": "afdep-v21-xb",
     "log": "c4m-fp8-hyb-small-n1.log",
     "log_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
    }
   ]
  },
  "single_domain": {
   "topology": "pokprod 4 x NVIDIA H100 80GB HBM3, one NVLink domain",
   "result": "10/10 GPU matrix cases and 8/8 invalid-route cases pass; 3A:1F and 1A:3F small and large pass",
   "summary": [
    "bf16-direct-small exit=0 bf16-hybrid-small exit=0 bf16-generic-control exit=0 bf16-off-large exit=0 bf16-on-large exit=0 fp8-direct-small exit=0 fp8-hybrid-small exit=0 fp8-generic-control exit=0 fp8-off-large exit=0 fp8-on-large exit=0 invalid-eager-dummy exit=1 assertion=yes invalid-eager-duplicate exit=1 assertion=yes invalid-eager-negative exit=1 assertion=yes invalid-eager-wide exit=1 assertion=yes invalid-graph-dummy exit=1 assertion=yes invalid-graph-duplicate exit=1 assertion=yes invalid-graph-negative exit=1 assertion=yes invalid-graph-wide exit=1 assertion=yes done ",
    "f1-small exit=0",
    "f1-large exit=0",
    "f3-small exit=0",
    "f3-large exit=0"
   ],
   "logs": [
    {
     "pod": "afdep-v21-h100-c",
     "log": "bf16-direct-small.log",
     "log_sha256": "23a866f980ddaa7337763c603e38dfbc2655873e7ea1e942abd48d6cd03ef7a6"
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    {
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    {
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     "log": "f1-small.log",
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    {
     "pod": "afdep-v21-h100-c",
     "log": "f3-large.log",
     "log_sha256": "d12f554c5f6f0262a23486a0cca949c738b5287eb4eb237bc457657ef8336ada"
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    {
     "pod": "afdep-v21-h100-c",
     "log": "f3-small.log",
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    {
     "pod": "afdep-v21-h100-c",
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     "log_sha256": "aab1b759ccece5d6d1b3b8ea2fb47c83a2fca4ceafeaedea75b9acf3e369c826"
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    {
     "pod": "afdep-v21-h100-c",
     "log": "fp8-generic-control.log",
     "log_sha256": "0ec3d7596a0e1bd27db48a41dd032678bf165c1287a8e160590ac626f4b66296"
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    {
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     "log": "fp8-hybrid-small.log",
     "log_sha256": "82f8cfc6dcb36473e80f81fe99fee9ea39ad4727e12440ea099bb7fbf4e391f2"
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     "pod": "afdep-v21-h100-c",
     "log": "fp8-off-large.log",
     "log_sha256": "e140990c819d2e8c6ecfdad712b237c628823f834399ad5c5dc548bd06e1d44c"
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     "log_sha256": "97369a074c27c6a3f6c91b42b839f77675f1dec53957f1844d2ac6b5362bdcaf"
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    {
     "pod": "afdep-v21-h100-c",
     "log": "invalid-eager-negative.log",
     "log_sha256": "d3520f1bba8b3476aabd22beb317655dcd119d7a295d9821a2eadd44b3a85ea8"
    },
    {
     "pod": "afdep-v21-h100-c",
     "log": "invalid-eager-wide.log",
     "log_sha256": "461a16a817bc6a2568edf27a02ab1daf3f7963cf8e52f26996dc40124f9c6311"
    },
    {
     "pod": "afdep-v21-h100-c",
     "log": "invalid-graph-dummy.log",
     "log_sha256": "c3b70f30de4578ff4a329b6657bf417816d458496f7e1bf5d91d3d2fe2a26e22"
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    {
     "pod": "afdep-v21-h100-c",
     "log": "invalid-graph-duplicate.log",
     "log_sha256": "bc5dba1c99fd830962d99bf75f20b61e53e6171ddc9b75b8973c8d60a9fbd957"
    },
    {
     "pod": "afdep-v21-h100-c",
     "log": "invalid-graph-negative.log",
     "log_sha256": "856fe1d55d397e071baa7e89fefb7a10fb67250fe598e8e5a24369d1e017c94c"
    },
    {
     "pod": "afdep-v21-h100-c",
     "log": "invalid-graph-wide.log",
     "log_sha256": "daf3c24977c61085fb0d1348eac0f466fbbffd2a7e123f41a3be64edfa973c82"
    }
   ]
  }
 },
 "scope": "communication only; no serving claim"
}