research: idle workers at 30 m/s (L122, no production change)
98% of idle-with-holes windows wait on the expanded critical set; region compile runs 0.26 ms but its gate stays pending 18 ms p50. Broad early admission: near +15.4 pt but p99 13.4 ms (over the VR 11 ms frame); near-only: +9.9 pt but far holes +1.5 pt. Trace instrumentation kept as a patch. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1
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#!/usr/bin/env python3
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"""Archived five-pair harness for transient L122 fast-travel admission candidates.
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The candidate CVar branches were removed after neither design met the quality gate.
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"""
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from __future__ import annotations
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import argparse
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import json
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import math
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import statistics
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import subprocess
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import time
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from pathlib import Path
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ROOT = Path(__file__).resolve().parents[4]
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HOST = Path("/home/jahni/VFHost")
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EDITOR = Path("/home/jahni/UnrealEngine/Engine/Binaries/Linux/UnrealEditor-Cmd")
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SPAWN_TN_M = (19.166015625, -14.2001953125, -753.3740234375)
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SPAWN_FI_M = (25.8369140625, 3.19921875, -737.0)
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DESIGN = "relax_expanded_critical_gate"
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NEAR_ONLY_DESIGN = "near_only_expanded_critical_gate"
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def percentile(values: list[float], fraction: float) -> float | None:
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if not values:
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return None
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ordered = sorted(values)
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return ordered[max(0, min(len(ordered) - 1, math.ceil(len(ordered) * fraction) - 1))]
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def read_events(path: Path) -> list[dict]:
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rows = []
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if path.is_file():
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for line in path.read_text(encoding="utf-8", errors="replace").splitlines():
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if not line.startswith("{"):
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continue
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try:
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rows.append(json.loads(line))
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except json.JSONDecodeError:
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continue
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return rows
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def run(scenario: str, condition: str, repetition: int, design: str) -> dict:
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candidate = condition == design
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wait_for_critical = 0 if candidate else 1
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near_only_while_critical_pending = int(candidate and design == NEAR_ONLY_DESIGN)
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if scenario == "movement":
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speed_cm_s, start_s, duration_s, exit_s, slot = 3000.0, 6.0, 12.0, 23.0, 0
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spawn = SPAWN_TN_M
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else:
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speed_cm_s, start_s, duration_s, exit_s, slot = 140.0, 20.0, 12.0, 37.0, 1
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spawn = SPAWN_FI_M
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output_name = scenario + ("-near-only" if design == NEAR_ONLY_DESIGN else "")
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root_out = ROOT / f"Saved/Linux/l122/{output_name}"
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out = root_out / condition / "unreal"
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host_out = HOST / "Plugins/VoxelForge/Saved/Linux/l122" / output_name / condition
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host_saved = HOST / "Saved/Linux/l122"
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label = f"{scenario}-r{repetition}"
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trace = out / f"{label}.trace.jsonl"
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abslog = out / f"{label}.log"
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stdout = out / f"{label}.stdout.log"
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export = host_out / "output" / label
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userdir = host_saved / "user" / scenario / condition / label
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zendata = host_saved / "zen" / scenario / condition / label
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ddc = host_saved / "DDC"
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for directory in (out, export, userdir, zendata, ddc):
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directory.mkdir(parents=True, exist_ok=True)
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trace.unlink(missing_ok=True)
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spawn_cm = ",".join(f"{value * 100.0:.3f}" for value in spawn)
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command = [
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str(EDITOR), str(HOST / "VFHost.uproject"), "-nullrhi", "-unattended",
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"-nop4", "-nosplash", "-NoSound", "-corelimit=12", "-NoZenAutoLaunch",
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"-notraceserver", "-nocrashreports", "-DisablePlugins=AndroidFileServer",
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"-ddc=NoZenLocalFallback", f"-userdir={userdir}", f"-ZenDataPath={zendata}",
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f"-LocalDataCachePath={ddc}", "-run=VoxelForgeExplore", "-seed=0",
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"-archetype=TunnelNetwork", f"-slot={slot}", "-modes=export", "-gameconfig=1",
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"-coreworldtest=1", "-ownerfourstrateplan=1", "-corevoxelsizecm=25",
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"-coreislandtest=0", "-corefallbacktest=0", "-coreofftest=0", "-coreplantest=0",
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"-settingsref=/Game/VoxelForge/DA_Settings.DA_Settings", "-corehybridmesher=0",
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f"-out={export}", "-voxel.StreamingCoarseFirst=1",
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"-voxel.StreamingDynamicNearReserve=1",
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"-voxel.StreamingLegacyPendingResultCap=0",
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"-voxel.CoreRegionConcurrentAdmission=1", "-voxel.StreamingResultBacklogCap=256",
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"-voxel.StreamingReadyQueueDepth=8", "-voxel.StreamingBackgroundWorkerCap=1",
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"-voxel.CoreColumnCacheDirectMapped=0", "-voxel.StreamingFarApplySupplement=1",
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f"-voxel.StreamingFastTravelWaitForAllCriticalTiles={wait_for_critical}",
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f"-voxel.StreamingFastTravelNearOnlyWhileCriticalPending={near_only_while_critical_pending}",
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"-voxel.CoreMCGradientMemoization=1", "-voxel.StreamingCollisionLookahead=1",
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"-voxel.TestMove=1", f"-voxel.TestMoveSpeedCmPerSecond={speed_cm_s:.1f}",
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f"-voxel.TestMoveStartSeconds={start_s:.1f}",
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f"-voxel.TestMoveDurationSeconds={duration_s:.1f}",
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f"-voxel.TestExitSeconds={exit_s:.1f}", "-voxel.TestMoveDirection=1,0,0",
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"-voxel.StreamingSchedulerPolicy=3", "-voxel.TestExitOnSteady=0",
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"-coreworldstreamtrace=1", f"-voxel.StartupTraceSpawnCm={spawn_cm}",
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"-voxel.StartupTraceUntilEndPlay=1", "-voxel.StartupTraceThroughCrossing=1",
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"-voxel.StartupTraceMaxTiles=16384", f"-voxel.StartupTraceFile={trace}",
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f"-abslog={abslog}",
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]
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wrapped = ["taskset", "-c", "0-11", "timeout", "1740s", *command]
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started = time.monotonic()
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with stdout.open("w", encoding="utf-8") as stream:
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process = subprocess.run(wrapped, cwd=ROOT, stdout=stream,
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stderr=subprocess.STDOUT, check=False, timeout=1740)
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events = read_events(trace)
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samples = [event for event in events if event.get("type") == "streaming_sample"]
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moving = [event for event in samples if float(event.get("speed_cm_s", 0.0)) >= 50.0]
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stop = next((event for event in events if event.get("type") == "streaming_test_move_stopped"), {})
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stop_s = float(stop.get("t_s", 0.0))
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move_start = min((float(event.get("t_s", 0.0)) for event in moving), default=float("inf"))
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dwell = [event for event in samples if float(event.get("t_s", 0.0)) >= stop_s
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and float(event.get("speed_cm_s", 0.0)) < 50.0]
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backend = next((event for event in events if event.get("type") == "worker_backend_config"), {})
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cap = next((event for event in events if event.get("type") == "streaming_worker_cap_readback"), {})
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if process.returncode or len(moving) < 40 or len(dwell) < 16:
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raise RuntimeError(f"incomplete {scenario} run: {trace}; exit={process.returncode}; "
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f"move={len(moving)} dwell={len(dwell)}")
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if (int(backend.get("streaming_fast_travel_wait_for_all_critical_tiles", -1))
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!= wait_for_critical
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or int(backend.get("streaming_fast_travel_near_only_while_critical_pending", -1))
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!= near_only_while_critical_pending
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or int(backend.get("streaming_far_apply_supplement", -1)) != 1
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or int(cap.get("streaming_background_worker_cap", -1)) != 1
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or int(backend.get("effective_tile_slots", -1)) != 8):
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raise RuntimeError(f"configuration readback mismatch: {backend}; {cap}")
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moving_scheduler = [event for event in events if event.get("type") == "scheduler_admission"
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and move_start <= float(event.get("t_s", 0.0)) < stop_s
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and event.get("moving", 0)]
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idle = [event for event in moving_scheduler
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if event.get("running_workers", 0) == 0
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and sum(event.get("desired_missing_by_lod", [0] * 9)[:3])
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+ sum(event.get("pending_by_lod", [0] * 9)[:3]) > 0]
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move_rows = []
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for event in moving:
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desired = event.get("desired_by_lod", [0] * 9)
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resident = event.get("resident_by_lod", [0] * 9)
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covered = event.get("covered_by_lod", resident)
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move_rows.append({
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"near_ready_pct": 100.0 * sum(resident[:3]) / max(1, sum(desired[:3])),
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"lod0_ready_pct": 100.0 * resident[0] / max(1, desired[0]),
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"lod1_ready_pct": 100.0 * resident[1] / max(1, desired[1]),
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"lod2_ready_pct": 100.0 * resident[2] / max(1, desired[2]),
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"far_hole_pct": 100.0 * (sum(desired[3:]) - sum(covered[3:]))
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/ max(1, sum(desired[3:])),
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})
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work_frames = [event for event in events if event.get("type") == "game_thread_work_frame"
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and move_start <= float(event.get("t_s", 0.0)) < stop_s]
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tick_values = [float(event.get("tick_ms", 0.0)) for event in work_frames]
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update_values = [float(event.get("update_chunks_ms", 0.0)) for event in work_frames]
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requests = [event for event in events if event.get("type") == "request"
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and move_start <= float(event.get("t_s", 0.0)) < stop_s
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and event.get("level", 9) <= 2]
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arrival_rows = [event for event in samples if float(event.get("t_s", 0.0)) < start_s
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and float(event.get("speed_cm_s", 0.0)) < 50.0]
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def near_complete(event: dict) -> bool:
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desired = event.get("desired_by_lod", [0] * 9)
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settled = event.get("settled_by_lod", [0] * 9)
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return sum(desired[:3]) > 0 and sum(settled[:3]) >= sum(desired[:3])
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def whole_complete(event: dict) -> bool:
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desired = event.get("desired_by_lod", [0] * 9)
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settled = event.get("settled_by_lod", [0] * 9)
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return sum(desired) > 0 and sum(settled) >= sum(desired)
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def far_holes(event: dict) -> float | None:
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desired = event.get("desired_by_lod", [0] * 9)[3:]
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covered = event.get("covered_by_lod", [0] * 9)[3:]
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return (100.0 * (sum(desired) - sum(covered)) / sum(desired)
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if sum(desired) else None)
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near_settled = next((event for event in arrival_rows if near_complete(event)), None)
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whole_settled = next((event for event in arrival_rows if whole_complete(event)), None)
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far_clear = next((event for event in arrival_rows if far_holes(event) == 0.0), None)
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def mean_metric(name: str, rows: list[dict]) -> float | None:
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values = [float(row[name]) for row in rows if row.get(name) is not None]
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return statistics.mean(values) if values else None
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row = {
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"scenario": scenario, "condition": condition, "repetition": repetition,
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"design": design, "speed_mps": speed_cm_s / 100.0,
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"wait_for_all_critical_tiles": wait_for_critical,
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"near_only_while_critical_pending": near_only_while_critical_pending,
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"exit_code": process.returncode, "wall_s": round(time.monotonic() - started, 3),
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"moving_samples": len(moving), "dwell_samples": len(dwell),
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"near_ready_moving_mean_pct": mean_metric("near_ready_pct", move_rows),
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"lod0_ready_moving_mean_pct": mean_metric("lod0_ready_pct", move_rows),
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"lod1_ready_moving_mean_pct": mean_metric("lod1_ready_pct", move_rows),
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"lod2_ready_moving_mean_pct": mean_metric("lod2_ready_pct", move_rows),
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"far_holes_moving_mean_pct": mean_metric("far_hole_pct", move_rows),
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"game_thread_tick_p99_ms": percentile(tick_values, 0.99),
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"game_thread_tick_max_ms": max(tick_values, default=None),
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"stream_update_p99_ms": percentile(update_values, 0.99),
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"stream_update_max_ms": max(update_values, default=None),
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"near_requests_during_move": len(requests),
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"arrival_sample_count": len(arrival_rows),
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"lod02_settled_t_s": float(near_settled["t_s"]) if near_settled else None,
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"whole_view_settled_t_s": float(whole_settled["t_s"]) if whole_settled else None,
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"far_clear_t_s": float(far_clear["t_s"]) if far_clear else None,
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"far_holes_at_pre_move_pct": far_holes(arrival_rows[-1]) if arrival_rows else None,
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"idle_missing_near_windows": len(idle),
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"idle_critical_gate_closed": sum(not event.get("critical_tiles_ready", 1)
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for event in idle),
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"idle_exact_region_declines": sum(
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sum(event.get("region_compile_declines_by_lod", [0] * 9)[:3]) > 0
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for event in idle),
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"idle_far_parent_declines": sum(
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sum(event.get("far_parent_declines_by_lod", [0] * 9)[:3]) > 0
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for event in idle),
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"idle_near_cap_declines": sum(
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any(value in (1, 2) for value in event.get("declined_rule_by_lod", [0] * 9)[:3])
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for event in idle),
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"idle_desired_center_stale": sum(not event.get("desired_center_current", 1)
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for event in idle),
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"trace": str(trace.relative_to(ROOT)), "log": str(abslog.relative_to(ROOT)),
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}
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print("[L122Pair] " + json.dumps(row, sort_keys=True), flush=True)
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return row
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def pairs_for(runs: list[dict], scenario: str, design: str) -> list[dict]:
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rows = []
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for repetition in range(1, 6):
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baseline = next(row for row in runs if row["scenario"] == scenario
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and row["condition"] == "baseline" and row["repetition"] == repetition)
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candidate = next(row for row in runs if row["scenario"] == scenario
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and row["condition"] == design and row["repetition"] == repetition)
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rows.append({
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"repetition": repetition,
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"near_ready_delta_pct": candidate.get("near_ready_moving_mean_pct", 0.0)
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- baseline.get("near_ready_moving_mean_pct", 0.0),
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"lod0_ready_delta_pct": candidate.get("lod0_ready_moving_mean_pct", 0.0)
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- baseline.get("lod0_ready_moving_mean_pct", 0.0),
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"lod1_ready_delta_pct": candidate.get("lod1_ready_moving_mean_pct", 0.0)
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- baseline.get("lod1_ready_moving_mean_pct", 0.0),
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"lod2_ready_delta_pct": candidate.get("lod2_ready_moving_mean_pct", 0.0)
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- baseline.get("lod2_ready_moving_mean_pct", 0.0),
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"far_holes_delta_pct": candidate.get("far_holes_moving_mean_pct", 0.0)
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- baseline.get("far_holes_moving_mean_pct", 0.0),
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"tick_p99_delta_ms": candidate.get("game_thread_tick_p99_ms", 0.0)
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- baseline.get("game_thread_tick_p99_ms", 0.0),
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"tick_max_delta_ms": candidate.get("game_thread_tick_max_ms", 0.0)
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- baseline.get("game_thread_tick_max_ms", 0.0),
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})
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return rows
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def main() -> int:
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parser = argparse.ArgumentParser()
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parser.add_argument("--scenario", choices=("movement", "arrival"), required=True)
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parser.add_argument("--design", choices=(DESIGN, NEAR_ONLY_DESIGN), default=DESIGN)
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args = parser.parse_args()
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if not EDITOR.is_file():
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raise SystemExit(f"missing Unreal editor: {EDITOR}")
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output_name = args.scenario + ("-near-only" if args.design == NEAR_ONLY_DESIGN else "")
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out = ROOT / f"Saved/Linux/l122/{output_name}"
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out.mkdir(parents=True, exist_ok=True)
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runs = []
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for repetition in range(1, 6):
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order = ("baseline", args.design) if repetition % 2 else (args.design, "baseline")
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for condition in order:
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runs.append(run(args.scenario, condition, repetition, args.design))
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(out / "runs-partial.json").write_text(json.dumps(runs, indent=2) + "\n",
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encoding="utf-8")
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pairs = pairs_for(runs, args.scenario, args.design)
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summary = {
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"design_id": args.design,
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"design": ("Allow fast-travel near LOD0-2 admission after the 3x3 walkable ring is ready "
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"while other expanded critical tiles remain unresident; skip directional sort "
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"and far admission until the critical set is ready."
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if args.design == NEAR_ONLY_DESIGN else
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"Allow fast-travel near/far admissions after the 3x3 walkable ring is ready, "
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"even while other expanded critical tiles remain unresident; critical requests "
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"still submit first."),
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"scenario": args.scenario,
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"runs": runs,
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"pairs": pairs,
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"paired_median_near_ready_delta_pct": statistics.median(
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pair["near_ready_delta_pct"] for pair in pairs),
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"paired_median_far_holes_delta_pct": statistics.median(
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pair["far_holes_delta_pct"] for pair in pairs),
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"paired_median_tick_p99_delta_ms": statistics.median(
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pair["tick_p99_delta_ms"] for pair in pairs),
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"paired_median_tick_max_delta_ms": statistics.median(
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pair["tick_max_delta_ms"] for pair in pairs),
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}
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(out / "summary.json").write_text(json.dumps(summary, indent=2) + "\n",
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encoding="utf-8")
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return 0
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if __name__ == "__main__":
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raise SystemExit(main())
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