{
  "version": 1,
  "captured": "2026-05-20",
  "captured_via": "bench/run.sh -n 5",
  "note": "Baseline for bench/check.py regression detection. The language-invariant thresholds (rc/bump <= 1.3x throughput, p99/median <= 5x latency) are NOT the regression-check tolerances; the per-metric tolerances below are tuned to absorb run-to-run noise on a quiet developer machine. To update after an intentional change, re-run bench/run.sh and replace the values, recording the reason in the commit body that ships the baseline bump. The latency arms gate only on median / p99 / p99_over_median — max_us and p99_9_us were removed on the 2026-05-20 recapture (Gitea #15 / #16) because tail-of-distribution latency metrics are dominated by OS-level jitter (THP defrag, scheduler preemption, IRQ load), not allocator behaviour, and produced 3+ consecutive false-positive REGRESSION rows on byte-identical no-op milestones. See docs/specs/2026-05-20-bench-harness-recalibration.md.",
  "throughput": {
    "bench_list_sum": {
      "gc_s": {
        "baseline": 0.150576,
        "tolerance_pct": 10
      },
      "bump_s": {
        "baseline": 0.052977,
        "tolerance_pct": 10
      },
      "rc_s": {
        "baseline": 0.143404,
        "tolerance_pct": 10
      },
      "gc_over_bump": {
        "baseline": 2.84,
        "tolerance_pct": 8
      },
      "rc_over_bump": {
        "baseline": 2.71,
        "tolerance_pct": 8
      },
      "gc_rss_kb": {
        "baseline": 137636.0,
        "tolerance_pct": 5
      },
      "bump_rss_kb": {
        "baseline": 97436.0,
        "tolerance_pct": 5
      },
      "rc_rss_kb": {
        "baseline": 193628.0,
        "tolerance_pct": 5
      }
    },
    "bench_tree_walk": {
      "gc_s": {
        "baseline": 0.101088,
        "tolerance_pct": 10
      },
      "bump_s": {
        "baseline": 0.038371,
        "tolerance_pct": 10
      },
      "rc_s": {
        "baseline": 0.098525,
        "tolerance_pct": 10
      },
      "gc_over_bump": {
        "baseline": 2.63,
        "tolerance_pct": 8
      },
      "rc_over_bump": {
        "baseline": 2.57,
        "tolerance_pct": 8
      },
      "gc_rss_kb": {
        "baseline": 73316.0,
        "tolerance_pct": 5
      },
      "bump_rss_kb": {
        "baseline": 55196.0,
        "tolerance_pct": 5
      },
      "rc_rss_kb": {
        "baseline": 108764.0,
        "tolerance_pct": 5
      }
    },
    "bench_closure_chain": {
      "gc_s": {
        "baseline": 0.012135,
        "tolerance_pct": 25
      },
      "bump_s": {
        "baseline": 0.007945,
        "tolerance_pct": 25
      },
      "rc_s": {
        "baseline": 0.031716,
        "tolerance_pct": 20
      },
      "gc_over_bump": {
        "baseline": 1.53,
        "tolerance_pct": 15
      },
      "rc_over_bump": {
        "baseline": 3.99,
        "tolerance_pct": 15
      },
      "gc_rss_kb": {
        "baseline": 13684.0,
        "tolerance_pct": 15
      },
      "bump_rss_kb": {
        "baseline": 15836.0,
        "tolerance_pct": 15
      },
      "rc_rss_kb": {
        "baseline": 39652.0,
        "tolerance_pct": 10
      }
    },
    "bench_hof_pipeline": {
      "gc_s": {
        "baseline": 0.149062,
        "tolerance_pct": 10
      },
      "bump_s": {
        "baseline": 0.051993,
        "tolerance_pct": 10
      },
      "rc_s": {
        "baseline": 0.143367,
        "tolerance_pct": 10
      },
      "gc_over_bump": {
        "baseline": 2.87,
        "tolerance_pct": 8
      },
      "rc_over_bump": {
        "baseline": 2.76,
        "tolerance_pct": 8
      },
      "gc_rss_kb": {
        "baseline": 137564.0,
        "tolerance_pct": 5
      },
      "bump_rss_kb": {
        "baseline": 97628.0,
        "tolerance_pct": 5
      },
      "rc_rss_kb": {
        "baseline": 193816.0,
        "tolerance_pct": 5
      }
    },
    "bench_compute_collatz": {
      "gc_s": {
        "baseline": 0.056628,
        "tolerance_pct": 12
      },
      "bump_s": {
        "baseline": 0.056266,
        "tolerance_pct": 12
      },
      "rc_s": {
        "baseline": 0.05629,
        "tolerance_pct": 12
      },
      "gc_over_bump": {
        "baseline": 1.01,
        "tolerance_pct": 10
      },
      "rc_over_bump": {
        "baseline": 1.0,
        "tolerance_pct": 10
      },
      "gc_rss_kb": {
        "baseline": 13860.0,
        "tolerance_pct": 15
      },
      "bump_rss_kb": {
        "baseline": 14044.0,
        "tolerance_pct": 15
      },
      "rc_rss_kb": {
        "baseline": 14012.0,
        "tolerance_pct": 15
      }
    },
    "bench_list_sum_explicit": {
      "gc_s": {
        "baseline": 0.1506,
        "tolerance_pct": 10
      },
      "bump_s": {
        "baseline": 0.053389,
        "tolerance_pct": 10
      },
      "rc_s": {
        "baseline": 0.15632,
        "tolerance_pct": 10
      },
      "gc_over_bump": {
        "baseline": 2.82,
        "tolerance_pct": 8
      },
      "rc_over_bump": {
        "baseline": 2.93,
        "tolerance_pct": 8
      },
      "gc_rss_kb": {
        "baseline": 137196.0,
        "tolerance_pct": 5
      },
      "bump_rss_kb": {
        "baseline": 97628.0,
        "tolerance_pct": 5
      },
      "rc_rss_kb": {
        "baseline": 141988.0,
        "tolerance_pct": 8
      }
    }
  },
  "latency": {
    "implicit_at_gc": {
      "median_us": {
        "baseline": 97.6,
        "tolerance_pct": 15
      },
      "p99_us": {
        "baseline": 7125.8,
        "tolerance_pct": 20
      },
      "p99_over_median": {
        "baseline": 72.79,
        "tolerance_pct": 20
      }
    },
    "explicit_at_rc": {
      "median_us": {
        "baseline": 221.2,
        "tolerance_pct": 15
      },
      "p99_us": {
        "baseline": 428.8,
        "tolerance_pct": 25
      },
      "p99_over_median": {
        "baseline": 1.93,
        "tolerance_pct": 25
      }
    },
    "implicit_at_rc": {
      "median_us": {
        "baseline": 301.2,
        "tolerance_pct": 15
      },
      "p99_us": {
        "baseline": 461.8,
        "tolerance_pct": 20
      },
      "p99_over_median": {
        "baseline": 1.53,
        "tolerance_pct": 20
      }
    }
  }
}