{
  "schema": "pg36-ch26-reference-run-v1",
  "release": "1.0-sandbox",
  "captured_at": "2026-07-29T23:34:14.930437Z",
  "run_id": "6c44ebdb-2206-48c3-8089-d90fdff45204",
  "preflight_run_id": "b31084b1-e8b3-44c1-af23-b827814f76c8",
  "target": "pg36-l2-vagrant/pg-test",
  "mode": "bounded-closed-loop-direct-primary-capacity-probe",
  "risk": "L2-bounded-performance-exercise",
  "environment": {
    "client": {
      "host": "pg-meta-1",
      "cpu_count": 2,
      "memory_bytes": 4089262080,
      "pgbench": "18.4"
    },
    "server": {
      "host": "pg-test-1",
      "cpu_count": 1,
      "memory_bytes": 2048679936,
      "postgresql": "18.4",
      "shared_buffers_bytes": 512753664
    },
    "client_and_server_are_distinct_hosts": true,
    "connection_path": "direct primary PostgreSQL 5432",
    "haproxy_measured": false,
    "pgbouncer_measured": false
  },
  "experiment": {
    "workload_id": "shop-mix-v1",
    "arrival_model": "closed-loop",
    "transaction_mix": {
      "read-product": 50,
      "read-order": 30,
      "place-order": 20
    },
    "dataset_scales": [
      {
        "scale_id": "S",
        "scale_factor": 1,
        "customers": 10000,
        "products": 2000,
        "historical_orders": 100000,
        "schema_bytes": 29704192,
        "database_bytes": 37869247,
        "initialization_seconds": 2.1667276899970602
      },
      {
        "scale_id": "M",
        "scale_factor": 8,
        "customers": 80000,
        "products": 16000,
        "historical_orders": 800000,
        "schema_bytes": 235175936,
        "database_bytes": 243594943,
        "initialization_seconds": 17.09472701800405
      },
      {
        "scale_id": "L",
        "scale_factor": 32,
        "customers": 320000,
        "products": 64000,
        "historical_orders": 3200000,
        "schema_bytes": 942268416,
        "database_bytes": 950982335,
        "initialization_seconds": 84.8189569709939
      }
    ],
    "cells": 6,
    "repetitions_per_cell": 5,
    "measured_runs": 30,
    "measured_seconds_per_run": 8,
    "transactions": 511709,
    "warm_cache_only": true,
    "statistics_reset": false,
    "results": [
      {
        "cell_id": "S-c1",
        "clients": 1,
        "transactions": 59854,
        "failures": 0,
        "late_transactions": 0,
        "tps_median": 1508.509028,
        "tps_bootstrap_95": [
          1446.529744,
          1546.321406
        ],
        "latency_ms": {
          "p50": 0.334,
          "p95": 2.152,
          "p99": 2.594940000000002,
          "max": 20.434
        },
        "server_work_ratio_median": 0.48944512009729396,
        "server_iowait_ratio_median": 0.0765771013883142,
        "client_work_ratio_median": 0.17743682161720944,
        "block_reads": 0,
        "block_hits": 675976,
        "wal_bytes_per_transaction": 160.32739666521869,
        "durable_bytes_per_place_order": 415.2063044379925,
        "deadlocks": 0,
        "temp_bytes": 0
      },
      {
        "cell_id": "S-c8",
        "clients": 8,
        "transactions": 115671,
        "failures": 0,
        "late_transactions": 0,
        "tps_median": 2920.501364,
        "tps_bootstrap_95": [
          2869.289546,
          3005.074198
        ],
        "latency_ms": {
          "p50": 1.334,
          "p95": 9.448,
          "p99": 12.927300000000002,
          "max": 56.481
        },
        "server_work_ratio_median": 0.84187959214275,
        "server_iowait_ratio_median": 0.002064777327935223,
        "client_work_ratio_median": 0.2949704101031076,
        "block_reads": 0,
        "block_hits": 1323054,
        "wal_bytes_per_transaction": 159.52791105808717,
        "durable_bytes_per_place_order": 409.120977173301,
        "deadlocks": 0,
        "temp_bytes": 0
      },
      {
        "cell_id": "M-c1",
        "clients": 1,
        "transactions": 61093,
        "failures": 0,
        "late_transactions": 0,
        "tps_median": 1555.819924,
        "tps_bootstrap_95": [
          1461.986657,
          1570.133179
        ],
        "latency_ms": {
          "p50": 0.33,
          "p95": 2.123,
          "p99": 2.5980800000000013,
          "max": 10.774
        },
        "server_work_ratio_median": 0.5010457315377224,
        "server_iowait_ratio_median": 0.07520443896302019,
        "client_work_ratio_median": 0.17793415337990662,
        "block_reads": 0,
        "block_hits": 733198,
        "wal_bytes_per_transaction": 175.95407002438904,
        "durable_bytes_per_place_order": 412.80923711340205,
        "deadlocks": 0,
        "temp_bytes": 0
      },
      {
        "cell_id": "M-c8",
        "clients": 8,
        "transactions": 114051,
        "failures": 0,
        "late_transactions": 0,
        "tps_median": 2911.528724,
        "tps_bootstrap_95": [
          2755.437041,
          2930.270472
        ],
        "latency_ms": {
          "p50": 1.37,
          "p95": 9.3975,
          "p99": 12.5705,
          "max": 41.174
        },
        "server_work_ratio_median": 0.8396077568503199,
        "server_iowait_ratio_median": 0.0020242914979757085,
        "client_work_ratio_median": 0.29074963105972057,
        "block_reads": 0,
        "block_hits": 1326143,
        "wal_bytes_per_transaction": 161.87897519530736,
        "durable_bytes_per_place_order": 405.965808266609,
        "deadlocks": 0,
        "temp_bytes": 0
      },
      {
        "cell_id": "L-c1",
        "clients": 1,
        "transactions": 55309,
        "failures": 0,
        "late_transactions": 0,
        "tps_median": 1423.631838,
        "tps_bootstrap_95": [
          1226.066806,
          1431.408703
        ],
        "latency_ms": {
          "p50": 0.36,
          "p95": 2.259,
          "p99": 2.8468399999999967,
          "max": 30.307
        },
        "server_work_ratio_median": 0.4630723224144277,
        "server_iowait_ratio_median": 0.08196785670469882,
        "client_work_ratio_median": 0.16167923890694336,
        "block_reads": 2500,
        "block_hits": 629335,
        "wal_bytes_per_transaction": 157.55858901806215,
        "durable_bytes_per_place_order": 411.5044215516455,
        "deadlocks": 0,
        "temp_bytes": 0
      },
      {
        "cell_id": "L-c8",
        "clients": 8,
        "transactions": 105731,
        "failures": 0,
        "late_transactions": 0,
        "tps_median": 2774.267108,
        "tps_bootstrap_95": [
          2216.087142,
          2824.359215
        ],
        "latency_ms": {
          "p50": 1.447,
          "p95": 10.086500000000001,
          "p99": 14.494,
          "max": 94.33
        },
        "server_work_ratio_median": 0.8422334682860999,
        "server_iowait_ratio_median": 0.003117408906882591,
        "client_work_ratio_median": 0.27806934443458475,
        "block_reads": 14491,
        "block_hits": 1344632,
        "wal_bytes_per_transaction": 196.1845343371386,
        "durable_bytes_per_place_order": 407.87956014913397,
        "deadlocks": 0,
        "temp_bytes": 0
      }
    ]
  },
  "pigsty_corroboration": {
    "window_scope": "full exercise including initialization, warm-up, measured runs, and gaps; native per-run evidence is authoritative for cell arithmetic",
    "server_cpu_busy_percent": {
      "median": 64.36666666665892,
      "maximum": 100.0
    },
    "server_cpu_iowait_percent": {
      "median": 2.766666666666661,
      "maximum": 5.100000000000004
    },
    "client_cpu_busy_percent": {
      "median": 23.000000000029107,
      "maximum": 28.96666666672294
    },
    "server_disk_read_bytes_per_second": {
      "median": 429806.93333333335,
      "maximum": 13991116.8
    },
    "server_disk_write_bytes_per_second": {
      "median": 4922436.266666667,
      "maximum": 81219532.8
    },
    "wal_bytes_per_second": {
      "median": 516682.36666666664,
      "maximum": 46178203.63333333
    },
    "database_commits_per_second": {
      "median": 1186.0,
      "maximum": 2459.5333333333333
    },
    "replica_replay_gap_bytes": {
      "median": 0.0,
      "maximum": 3471848.0
    }
  },
  "capacity_model": {
    "sandbox_only_linear_projection": [
      {
        "scale_id": "S",
        "cpu_seconds_per_mixed_transaction": 0.0002905945945945946,
        "tps_at_65_percent_cpu_if_linear": 2236.7931547619046,
        "wal_bytes_per_mixed_transaction": 159.52791105808717
      },
      {
        "scale_id": "M",
        "cpu_seconds_per_mixed_transaction": 0.0002924022697263651,
        "tps_at_65_percent_cpu_if_linear": 2222.9649605944605,
        "wal_bytes_per_mixed_transaction": 161.87897519530736
      },
      {
        "scale_id": "L",
        "cpu_seconds_per_mixed_transaction": 0.0003070408708480416,
        "tps_at_65_percent_cpu_if_linear": 2116.9820102604294,
        "wal_bytes_per_mixed_transaction": 196.1845343371386
      }
    ],
    "projection_assumptions": [
      "the 50/30/20 operation mix remains fixed",
      "CPU demand scales linearly near the observation point",
      "cache, I/O, lock, client, and background-work costs do not become a tighter bottleneck",
      "the result remains on the same recorded sandbox"
    ],
    "saturation_brackets": [
      {
        "scale_id": "S",
        "throughput_gain_c8_over_c1": 1.9360184856646414,
        "pooled_p95_multiplier_c8_over_c1": 4.390334572490707,
        "c8_server_work_ratio": 0.84187959214275,
        "c8_client_work_ratio": 0.2949704101031076,
        "exact_knee_known": false,
        "interpretation": "knee-not-bracketed-by-one-and-eight-clients"
      },
      {
        "scale_id": "M",
        "throughput_gain_c8_over_c1": 1.8713789938584178,
        "pooled_p95_multiplier_c8_over_c1": 4.426519076778144,
        "c8_server_work_ratio": 0.8396077568503199,
        "c8_client_work_ratio": 0.29074963105972057,
        "exact_knee_known": false,
        "interpretation": "knee-not-bracketed-by-one-and-eight-clients"
      },
      {
        "scale_id": "L",
        "throughput_gain_c8_over_c1": 1.9487251085206483,
        "pooled_p95_multiplier_c8_over_c1": 4.465028773793715,
        "c8_server_work_ratio": 0.8422334682860999,
        "c8_client_work_ratio": 0.27806934443458475,
        "exact_knee_known": false,
        "interpretation": "knee-not-bracketed-by-one-and-eight-clients"
      }
    ],
    "production_sustainable_tps": null,
    "why_null": [
      "one shared-hypervisor virtual CPU and virtual storage are not production hardware",
      "the measured probe is closed-loop rather than an offered-load SLO sweep",
      "the direct-primary path excludes application, HAProxy, PgBouncer, and WAN costs",
      "failure, maintenance, backup, restore, and capacity-lead-time scenarios were not measured"
    ]
  },
  "validation": {
    "positive_validation_passed": true,
    "counterexamples_rejected": 26,
    "raw_transaction_logs_public": false,
    "raw_system_samples_public": false,
    "raw_sql_snapshots_public": false,
    "query_text_public": false,
    "secret_material_public": false,
    "database_cleanup_verified": true,
    "role_cleanup_verified": true,
    "remote_temp_cleanup_verified": true
  },
  "claims_not_made": [
    "the result is universal PostgreSQL performance",
    "the result is production sizing or an admitted-load SLO",
    "the exact saturation knee is known",
    "cold-cache behavior was measured",
    "application, HAProxy, PgBouncer, WAN, backup, maintenance, failure, or recovery capacity was measured",
    "virtual storage represents production IOPS, latency, endurance, or failure domains"
  ],
  "sandbox_ch26_gate": "passed",
  "production_ch26_gate": "pending",
  "production_approval": false
}