{
  "schema": "tether.landing-when-it-helps.v1",
  "measured_on": "2026-10-18",
  "crossover": {
    "measured_units": 16,
    "load1_low": 391,
    "load1_high": 674,
    "planner_units": 33,
    "declined_units": 32,
    "note": "Measured on a contended Mac: splitting beat local at 16 units and lost at 12. The load slows only the local side, so 16 is a lower bound, not an idle-machine result. With the clean peer terms the planner uses, the same boundary is 33 units: 32 stays local, 33 is the first it sends out."
  },
  "stage": {
    "prior_s": 6.0,
    "previous_prior_s": 4.0,
    "stage_mb": 24.71,
    "samples_s": [
      4.7,
      5.7,
      5.84
    ],
    "samples": 3,
    "note": "The fixed cost of sending a test stage to a peer, raised from 4.0 s because every measured push of the real 24.71 MB stage took longer than that. A higher fixed cost makes Tether decline more small jobs, not fewer."
  },
  "pool": {
    "cores_at_least": 42,
    "local_cores": 16,
    "donor_cores": 26,
    "gib_low": 140,
    "gib_high": 161,
    "donor_gib_low": 12,
    "donor_gib_high": 33,
    "note": "One real dispatch: this Mac's 16 cores plus one donor's 26. The donor's free memory is what varies, so the pool is given as a range rather than one figure."
  },
  "provenance": [
    {
      "figure": "crossover.measured_units",
      "source": "tests/test_fabric_split_is_aggregate_not_outsourcing.py",
      "commit": "240e10c7"
    },
    {
      "figure": "crossover.load1_low",
      "source": "tests/test_fabric_split_is_aggregate_not_outsourcing.py",
      "commit": "240e10c7"
    },
    {
      "figure": "crossover.load1_high",
      "source": "tests/test_fabric_split_is_aggregate_not_outsourcing.py",
      "commit": "240e10c7"
    },
    {
      "figure": "crossover.planner_units",
      "source": "tests/test_fabric_split_is_aggregate_not_outsourcing.py",
      "commit": "240e10c7"
    },
    {
      "figure": "stage.prior_s",
      "source": "src/tether_test_peers.py",
      "commit": "240e10c7"
    },
    {
      "figure": "stage.stage_mb",
      "source": "src/tether_test_peers.py",
      "commit": "240e10c7"
    },
    {
      "figure": "stage.samples_s",
      "source": "src/tether_test_peers.py",
      "commit": "240e10c7"
    },
    {
      "figure": "pool.cores_at_least",
      "source": ".tether-lead-work/CORE_MEASURED_20261018.md",
      "commit": ""
    },
    {
      "figure": "pool.gib_low",
      "source": ".tether-lead-work/CORE_MEASURED_20261018.md",
      "commit": ""
    },
    {
      "figure": "pool.gib_high",
      "source": ".tether-lead-work/CORE_MEASURED_20261018.md",
      "commit": ""
    }
  ]
}