docs(perf): record corrected Slice A RDP baselines
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Erik
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4 changed files with 256 additions and 11 deletions
158
docs/research/2026-07-24-slice-a-rdp-baselines.json
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158
docs/research/2026-07-24-slice-a-rdp-baselines.json
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{
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"schemaVersion": 1,
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"capturedUtcDate": "2026-07-24",
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"authority": "diagnostic-rdp-only",
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"purpose": "Corrected Slice A tooling validation and directional baseline. This does not satisfy the physical-local exit criterion.",
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"referenceConfig": "docs/research/2026-07-24-performance-reference-config.md",
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"rawArtifactPolicy": "Raw CSV, EventPipe, screenshot, and process logs remain local and uncommitted. This file contains the sanitized reproducible summary.",
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"captures": [
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{
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"name": "capped-nine-stop",
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"binaryCommit": "2c874b09771cfd0062b4e23083ee13142761fe80",
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"sourceCommit": "2c874b09771cfd0062b4e23083ee13142761fe80",
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"binaryMatchesSource": true,
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"route": "Caul, Sawato, Rynthid, Aerlinthe, Sawato, Holtburg, Caul, Sawato, Caul",
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"result": "pass-graceful",
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"elapsedSeconds": 560.170,
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"measuredSeconds": 549.427,
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"frames": 17400,
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"frameCpuUs": { "p50": 31240, "p95": 31868, "p99": 33032, "p999": 136090, "max": 396953 },
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"gpuUs": { "p50": 3626, "p95": 5826, "p99": 6807, "p999": 7654, "max": 389392 },
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"frameThreadAllocationBytes": { "p50": 31552, "p95": 159944, "p99": 2835704, "p999": 13780848, "max": 212677752 },
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"updateUs": { "p50": 1071, "p95": 1962, "p99": 4079, "max": 247943 },
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"process": {
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"allocationBytesPerSecondMean": 36609676,
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"allocationBytesPerSecondMax": 2754634720,
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"gcPauseSecondsTotal": 2.623917,
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"gcPauseSecondsMax": 0.270281,
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"workingSetBytesMax": 1642217472,
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"gen0Collections": 138,
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"gen1Collections": 132,
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"gen2Collections": 70,
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"contentions": 5994
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},
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"portalWindows": [
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{ "destination": "Caul", "cpuP99Us": 76758, "cpuMaxUs": 110974, "gpuP99Us": 7365, "allocationMaxBytes": 56550848, "updateP99Us": 47519, "uploadP99Us": 3637 },
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{ "destination": "Sawato", "cpuP99Us": 99077, "cpuMaxUs": 396953, "gpuP99Us": 6957, "allocationMaxBytes": 212677752, "updateP99Us": 19542, "uploadP99Us": 4402 },
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{ "destination": "Rynthid", "cpuP99Us": 55614, "cpuMaxUs": 308664, "gpuP99Us": 3118, "allocationMaxBytes": 15018512, "updateP99Us": 22441, "uploadP99Us": 2502 },
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{ "destination": "Aerlinthe", "cpuP99Us": 47918, "cpuMaxUs": 259394, "gpuP99Us": 6205, "allocationMaxBytes": 13780848, "updateP99Us": 13808, "uploadP99Us": 553 },
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{ "destination": "Sawato-revisit", "cpuP99Us": 64704, "cpuMaxUs": 325502, "gpuP99Us": 5356, "allocationMaxBytes": 145024240, "updateP99Us": 34717, "uploadP99Us": 907 },
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{ "destination": "Holtburg", "cpuP99Us": 48965, "cpuMaxUs": 83478, "gpuP99Us": 5525, "allocationMaxBytes": 16950536, "updateP99Us": 19088, "uploadP99Us": 5231 },
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{ "destination": "Caul-return", "cpuP99Us": 58393, "cpuMaxUs": 90350, "gpuP99Us": 6642, "allocationMaxBytes": 35985776, "updateP99Us": 29162, "uploadP99Us": 1333 },
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{ "destination": "Sawato-plateau", "cpuP99Us": 76006, "cpuMaxUs": 312187, "gpuP99Us": 6454, "allocationMaxBytes": 144965224, "updateP99Us": 18399, "uploadP99Us": 2060 },
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{ "destination": "Caul-plateau", "cpuP99Us": 48700, "cpuMaxUs": 87818, "gpuP99Us": 6788, "allocationMaxBytes": 35966704, "updateP99Us": 23387, "uploadP99Us": 329 }
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]
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},
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{
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"name": "uncapped-nine-stop",
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"binaryCommit": "4285f1db",
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"sourceCommit": "4285f1db",
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"binaryMatchesSource": true,
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"route": "Caul, Sawato, Rynthid, Aerlinthe, Sawato, Holtburg, Caul, Sawato, Caul",
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"result": "pass-graceful",
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"elapsedSeconds": 512.792,
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"measuredSeconds": 501.819,
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"frames": 229412,
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"frameCpuUs": { "p50": 1537, "p95": 6077, "p99": 8938, "p999": 16157, "max": 439275 },
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"gpuUs": { "p50": 935, "p95": 3288, "p99": 3470, "max": 357565 },
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"frameThreadAllocationBytes": { "p50": 28968, "p95": 71136, "p99": 97296, "max": 216373536 },
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"updateUs": { "p50": 177, "p95": 777, "p99": 1277, "max": 437906 },
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"process": {
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"allocationBytesPerSecondMean": 48457217,
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"allocationBytesPerSecondMax": 2167972952,
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"gcPauseSecondsTotal": 2.656187,
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"gcPauseSecondsMax": 0.259869,
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"workingSetBytesMax": 921333760,
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"gen0Collections": 279,
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"gen1Collections": 136,
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"gen2Collections": 80,
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"contentions": 5493
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},
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"portalWindows": [
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{ "destination": "Caul", "cpuP99Us": 15768, "cpuMaxUs": 40775, "gpuP99Us": 3521, "allocationMaxBytes": 516296, "updateP99Us": 2112, "uploadP99Us": 61 },
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{ "destination": "Sawato", "cpuP99Us": 9596, "cpuMaxUs": 361556, "gpuP99Us": 3339, "allocationMaxBytes": 216373536, "updateP99Us": 1360, "uploadP99Us": 71 },
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{ "destination": "Rynthid", "cpuP99Us": 2753, "cpuMaxUs": 325975, "gpuP99Us": 1259, "allocationMaxBytes": 13296880, "updateP99Us": 735, "uploadP99Us": 56 },
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{ "destination": "Aerlinthe", "cpuP99Us": 2351, "cpuMaxUs": 255745, "gpuP99Us": 1279, "allocationMaxBytes": 13790552, "updateP99Us": 431, "uploadP99Us": 17 },
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{ "destination": "Sawato-revisit", "cpuP99Us": 3466, "cpuMaxUs": 322834, "gpuP99Us": 2177, "allocationMaxBytes": 146032504, "updateP99Us": 487, "uploadP99Us": 22 },
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{ "destination": "Holtburg", "cpuP99Us": 2448, "cpuMaxUs": 291110, "gpuP99Us": 1104, "allocationMaxBytes": 15978352, "updateP99Us": 618, "uploadP99Us": 104 },
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{ "destination": "Caul-return", "cpuP99Us": 6763, "cpuMaxUs": 292269, "gpuP99Us": 2344, "allocationMaxBytes": 36035840, "updateP99Us": 1072, "uploadP99Us": 70 },
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{ "destination": "Sawato-plateau", "cpuP99Us": 9682, "cpuMaxUs": 439275, "gpuP99Us": 3371, "allocationMaxBytes": 213092152, "updateP99Us": 1407, "uploadP99Us": 67 },
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{ "destination": "Caul-plateau", "cpuP99Us": 2185, "cpuMaxUs": 319036, "gpuP99Us": 1138, "allocationMaxBytes": 36032184, "updateP99Us": 908, "uploadP99Us": 47 }
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]
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},
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{
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"name": "uncapped-dense-arwic",
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"binaryCommit": "24f898c54d7c6547555a4402543b6a3cd7ced7f6",
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"sourceCommit": "24f898c54d7c6547555a4402543b6a3cd7ced7f6",
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"binaryMatchesSource": true,
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"result": "pass-graceful",
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"elapsedSeconds": 66.861,
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"measuredSeconds": 56.752,
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"frames": 16350,
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"frameCpuUs": { "p50": 3487, "p95": 7351, "p99": 12690, "p999": 75737, "max": 346276 },
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"gpuUs": { "p50": 2299, "p95": 3236, "p99": 3653, "max": 342913 },
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"frameThreadAllocationBytes": { "p50": 52000, "p95": 82416, "max": 33240128 },
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"updateUs": { "p95": 1463 },
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"stationaryFiveSeconds": {
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"frames": 925,
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"frameCpuUs": { "p50": 4802, "p95": 7422, "p99": 8281 },
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"gpuUs": { "p50": 2711, "p99": 3242 },
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"frameThreadAllocationBytes": { "p50": 37688, "max": 13654512 },
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"updateUs": { "p95": 1328 }
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},
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"process": {
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"allocationBytesPerSecondMean": 60704238,
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"allocationBytesPerSecondMax": 2059370560,
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"gcPauseSecondsTotal": 0.328081,
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"gcPauseSecondsMax": 0.120149,
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"workingSetBytesMax": 834510848,
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"gen0Collections": 30,
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"gen1Collections": 19,
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"gen2Collections": 12,
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"contentions": 2145
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}
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},
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{
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"name": "uncapped-dense-arwic-no-process-counters",
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"binaryCommit": "24f898c54d7c6547555a4402543b6a3cd7ced7f6",
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"sourceCommit": "24f898c54d7c6547555a4402543b6a3cd7ced7f6",
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"binaryMatchesSource": true,
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"result": "pass-graceful",
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"stationaryFiveSeconds": {
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"frames": 918,
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"frameCpuUs": { "p50": 4870, "p95": 7212, "p99": 8081 },
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"gpuUs": { "p50": 2726, "p99": 2861 },
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"frameThreadAllocationBytes": { "p50": 38632, "max": 13661072 },
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"updateUs": { "p95": 1245 }
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}
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}
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],
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"observerEffect": {
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"comparison": "uncapped-dense-arwic process counters enabled versus disabled",
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"cpuP50Percent": -1.396,
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"cpuP95Percent": 2.912,
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"cpuP99Percent": 2.475,
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"gpuP50Percent": -0.550,
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"frameThreadAllocationP50Percent": -2.440,
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"interpretation": "The process-counter observer changes the stable sample by less than normal route variance."
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},
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"contentionStacks": {
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"capture": "capped-nine-stop",
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"totalAttributed": 5994,
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"sites": [
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{ "site": "AcDream.Content.DatDatabaseWrapper.TryGet", "count": 4516 },
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{ "site": "ObjectMeshManager.ProcessQueue", "count": 976 },
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{ "site": "DecodedTextureCache.GetOrCreate", "count": 254 },
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{ "site": "LandblockBuildFactory.Build", "count": 90 },
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{ "site": "LiveEntityHydrationController.OnCreate", "count": 74 },
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{ "site": "DatDatabaseWrapper.TryGetFileBytes", "count": 27 },
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{ "site": "other", "count": 57 }
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]
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},
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"remainingGate": [
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"Repeat the capped nine-stop route on the physical local AMD display path.",
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"Repeat the uncapped nine-stop route on the physical local AMD display path.",
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"Repeat the pinned uncapped dense-Arwic sample on the physical local AMD display path.",
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"Commit the physical-local summary before starting behavior-changing Slice C."
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]
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}
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72
docs/research/2026-07-24-slice-a-rdp-baselines.md
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72
docs/research/2026-07-24-slice-a-rdp-baselines.md
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# Slice A corrected RDP baselines
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**Date:** 2026-07-24
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**Authority:** diagnostic only; these captures do not satisfy the physical-local
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Slice A exit gate.
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The corrected tooling was exercised over capped and uncapped nine-stop routes,
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plus a pinned uncapped dense-Arwic sample. All runs reached the world, completed
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their route, and disconnected gracefully. The final dense run was made after
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binary provenance became part of every soak report: source and measured binary
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were both commit `24f898c54d7c6547555a4402543b6a3cd7ced7f6`, the tracked source
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tree was clean, and the report recorded an exact match.
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The machine/display contract is defined in
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[`2026-07-24-performance-reference-config.md`](2026-07-24-performance-reference-config.md).
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The full sanitized figures and portal windows are in
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[`2026-07-24-slice-a-rdp-baselines.json`](2026-07-24-slice-a-rdp-baselines.json).
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Raw CSV, EventPipe, screenshot, and process logs are intentionally local,
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untracked diagnostic artifacts.
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## Headline measurements
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| Capture | Frames | CPU p50 / p95 / p99 | GPU p50 / p95 / p99 | Frame-thread allocation p50 / max |
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|---|---:|---:|---:|---:|
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| Capped nine-stop | 17,400 | 31.240 / 31.868 / 33.032 ms | 3.626 / 5.826 / 6.807 ms | 31.6 KiB / 202.8 MiB |
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| Uncapped nine-stop | 229,412 | 1.537 / 6.077 / 8.938 ms | 0.935 / 3.288 / 3.470 ms | 28.3 KiB / 206.3 MiB |
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| Uncapped dense Arwic | 16,350 | 3.487 / 7.351 / 12.690 ms | 2.299 / 3.236 / 3.653 ms | 50.8 KiB / 31.7 MiB |
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| Dense Arwic, stable 5 s | 925 | 4.802 / 7.422 / 8.281 ms | 2.711 / — / 3.242 ms | 36.8 KiB / 13.0 MiB |
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The capped CPU distribution is the expected 32 ms RDP/pacing envelope, while
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the GL timestamps show only 3.6–6.8 ms of ordinary GPU work. The corrected GPU
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timer therefore no longer measures frame pacing as GPU submission time.
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Portal materialization remains the dominant transient cost. The uncapped
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Sawato materializations reached 206.3 MiB and 203.2 MiB of frame-thread
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allocation in a single frame. Process-wide allocation averaged 48.5 MB/s over
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the uncapped route, with 80 Gen-2 collections and a longest GC pause of
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260 ms. This evidence keeps prepared-content work as the next architectural
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priority.
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## Observer effect
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The dense-Arwic stationary sample was repeated without the process counter
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observer. Enabling it changed CPU p50 by -1.4%, p95 by +2.9%, p99 by +2.5%,
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GPU p50 by -0.6%, and frame-thread allocation p50 by -2.4%. Those differences
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are within natural route variance, so the observer is suitable for directional
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process-wide allocation and GC attribution.
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## Contention attribution
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The capped route recorded 5,994 contentions with stacks:
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| Site | Count | Share |
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|---|---:|---:|
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| `DatDatabaseWrapper.TryGet` | 4,516 | 75.3% |
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| `ObjectMeshManager.ProcessQueue` | 976 | 16.3% |
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| `DecodedTextureCache.GetOrCreate` | 254 | 4.2% |
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| `LandblockBuildFactory.Build` | 90 | 1.5% |
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| `LiveEntityHydrationController.OnCreate` | 74 | 1.2% |
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| `DatDatabaseWrapper.TryGetFileBytes` | 27 | 0.5% |
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| Other | 57 | 1.0% |
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This replaces speculation with a concrete ranking. It does not authorize
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lock-shape changes yet; the prepared-content slices should first remove demand
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from these paths and then the same capture must be repeated.
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## Gate state
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Slice A’s instrumentation and RDP validation are complete. The remaining exit
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gate is a capped nine-stop, uncapped nine-stop, and pinned dense-Arwic capture
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on the physical local AMD display path. Slice B is baseline-independent and may
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proceed. Slice C remains blocked until the physical-local evidence is committed.
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