{ "title": "Mixed Atmospheres: large-colony performance investigation", "measurement_date": "2026-11-06", "publication_status": "Research findings; no production adoption or release qualification", "recommendation": "Qualify the two exact parcel caches first. Keep numerical defaults. Redesign additional overlap for conservation safety. Target SO substeps and transport. Sustained smooth 3x remains unproven.", "native_replay": { "scope": "Four ABBA replays; same initial owner state and 3000 requested inputs; 12 workers; first 150 ticks excluded from timings. Full-cycle endpoint hashes match; not every intermediate full-cycle checkpoint was compared.", "baseline": { "mean_owner_ms": 89.754, "mean_transfer_ms": 18.433, "owner_p99_ms": 214.367, "worst_owner_ms": 967.313, "mean_peak_rss_MiB": 4396.9 }, "two_parcel_caches": { "mean_owner_ms": 78.639, "mean_transfer_ms": 8.504, "owner_p99_ms": 118.453, "worst_owner_ms": 141.571, "mean_peak_rss_MiB": 4397.4 }, "owner_time_reduction_percent": 12.38, "transfer_time_reduction_percent": 53.87, "full_cycle_final_owner_hashes_match": true, "short_tests": "Every intermediate owner image matches in separate 16-tick tests in both colonies at 1 and 12 workers.", "meaningful_memory_saving": false }, "live_game": { "caveat": "Ordered individual live runs, not repeated randomized causal estimates. Inputs vary with scheduling and external host work affected timings.", "speed_unit": "Game seconds / wall seconds", "industrial_base_full_cycle": { "duplicants": 32, "baseline": 1.297, "parcel_caches": 1.559, "multigrid_plus_1mL_detail": 1.932, "full_combination": 2.093 }, "spaced_out_900_ticks": { "duplicants": 14, "baseline": 0.986, "parcel_caches": 0.983 } }, "numerical_deviation": { "scope": "600-game-second native replay; same requested inputs; deviation from unchanged algorithm, not physical ground truth. Both variants include parcel caches.", "multigrid": { "mean_owner_ms": 65.962, "populated_temperature_rms_K": 3.719, "populated_temperature_max_K": 38.868, "liquid_volume_L1_m3": 0.5734, "liquid_volume_max_cell_m3": 0.1725, "gas_cell_constituent_L1_percent": 1.0995 }, "multigrid_plus_1mL_detail": { "mean_owner_ms": 50.321, "populated_temperature_rms_K": 2.852, "populated_temperature_max_K": 136.063, "gas_above_100g_temperature_max_K": 49.143, "liquid_volume_L1_m3": 9.98, "liquid_volume_max_cell_m3": 0.8448, "gas_cell_constituent_L1_percent": 1.0347 } }, "extra_overlap": { "status": "Unsafe experimental implementation; redesign before use", "added_game_second_staleness": 0.2, "short_live_observed_gain_percent": { "base": 14.6, "spaced_out": 7.6 }, "synthetic_counterexamples": { "freeze_mass_discrepancy_kg": 0.25, "withdrawal_shortfall_kg": 0.15, "skipped_heat_J": 4000 }, "caveat": "Focused synthetic counterexamples, not observed corruption in the large-colony runs." }, "verification": { "native_ctests_passed": 93, "live_runs_passed": 14, "managed_python_integration_suites_passed": true, "production_remaining": [ "15 Linux scenario batches", "Fresh full-cycle native replay and live-colony comparisons", "Windows OS/game qualification" ] }, "host": { "os": "Linux", "cpu": "Ryzen 9 5900X", "physical_cores": 12, "logical_threads": 24, "RAM_GiB_approx": 60, "GPU": "RTX 5090", "game_window": "640x480", "Windows_timing_measured": false }, "measurement_context": "The main performance comparisons are historical research experiments measured on 2026-11-06, not production performance claims. The dated progress update contains subsequent qualification and lookup microbenchmark findings.", "progress_update": { "date": "2026-11-07", "exact_parcel_caches": "Production qualification underway on latest main; no production adoption claimed yet.", "const_read_fix": { "status": "Synthetic operation ABBA improved; old/new synthetic checkpoints match; whole-cycle replay and live-colony timings still in progress", "change": "Const reads inspect untouched storage during occupied-volume initialization, neighbor snapshots and heat/energy queries, preventing unnecessary copy-on-write chunk copies", "regression_check": { "copied_cell_chunks": 1, "case": "Zero-momentum parcel admission across chunk boundaries, with and without a partial liquid cell", "kernels": 3, "scope": "Structural copy regression, not throughput or whole-game memory measurement" }, "whole_game_gain_claimed": false }, "numerical_defaults": "Unchanged", "extra_overlap": "Not adopted", "rejected_lookup_index": { "candidate": "Rebuild a parcel coalescing lookup index each frame", "status": "Rejected for the measured workload", "scope": "Synthetic lookup microbenchmark, not whole-game timing; first-match search, half of queries missing, index construction included", "held_entries": 35959, "queries": 16, "scan_ms": 0.41, "rebuild_index_and_query_ms": 2.232, "prior_colony_admission_samples": { "warmed_frames": 285, "median_held_admissions_per_frame": 13, "p95_held_admissions_per_frame": 19 } }, "qualification": { "status": "Full functional build checks and diagnostic equivalence passed; replay/game qualification in progress; candidate not committed or pushed", "native_CTests_passed": 93, "native_CTests_total": 93, "Python_suite": "Passed; 516 tests reported with 11 existing skips", "managed_suites": "Passed", "integration_suites": "Passed", "baseline_diagnostic_outputs_captured": 88, "known_nonzero_baseline_outcomes": 8, "running_or_pending": [ "Full 3000-tick native ABBA replay", "Current live-colony comparisons", "15 Linux scenario batches", "Windows OS/game qualification" ], "production_adoption_claimed": false, "diagnostic_comparison": { "outputs_compared": 88, "stdout_stderr_exit_match": true, "masked_timing_fields": [ "ref_ms", "prod_ms" ], "existing_nonzero_outcomes_unchanged": 8, "nonzero_outcomes_newly_passed": false }, "Windows_cross_build": { "DLLs": 2, "architecture": "x64", "status": "Passed", "focused_precision_and_parcel_controls": "Passed under Wine for all three kernels", "Windows_OS_game_qualification": false } }, "copy_operation_microbenchmark": { "date": "2026-11-07", "scope": "Operation microbenchmarks and synthetic-process RSS, not whole-game speed or RAM promises", "cells": 65536, "independent_zero_momentum_single_cell_admissions_per_run": 100, "runs_per_side_per_case": 2, "order": "ABBA", "all_old_new_synthetic_checkpoints_equal_within_each_case": true, "full_gas_implicit_volume_array": { "old_copied_chunks": 64, "new_copied_chunks": 1, "old_mean_ms_per_admission": 5.78034, "new_mean_ms_per_admission": 0.614468, "old_mean_peak_process_RSS_MiB": 77.140625, "new_mean_peak_process_RSS_MiB": 41.814453125 }, "existing_partial_liquid_array_chunk_boundary_recipient": { "old_copied_chunks": 2, "new_copied_chunks": 1, "old_mean_ms_per_admission": 0.189825, "new_mean_ms_per_admission": 0.1160045, "old_mean_peak_process_RSS_MiB": 41.61914, "new_mean_peak_process_RSS_MiB": 41.80273, "memory_reduction_established": false } } } }