p59: Sim 多世界并存后台压测（内存/GC 增长曲线证据单，只读）

目标：量化「多世界并存 × 天数」的内存/GC 增长，收口 P49 范围外项。
口径：新增 Headless `--profile-multiworld <worlds> <days> <npcs> <sampleEveryDays> <seedBase>`，
N 个 Sim 世界同时存活，每轮 Parallel.For 各推进 sampleEveryDays 天并采样一行
（worlds/events/rumors/annals/memory_entries/gc_live_mb/working_set_rss_mb/elapsed_s，
行尾 flush）；未改 Kernel/Sim 任何语义（Sim.initialWorldN / Sim.step 原样调用）。

标定：1 世界 × 2 天探针 = 34.2s（与 overnight-status 的 34.6s 一致），据此定 N=10 × 20 天。
运行：独立 systemd --user transient unit living-village-multiworld.service
（scripts/profile-multiworld.sh，StandardOutput=append: + exec 2>&1，state.json 记
pid/unit/log/commit/参数/起止/exit）。主运行 wall=1024.4s（17.1min < 40min），exit=0。

结论（artifacts/perf-multiworld/20260928T195839Z/README.md）：
- 随世界数近似线性，未超线性：N=1 vs N=10（同日 D=20）annals/memory_entries 恰 10×、
  rumors 9.67×、gc_live 8.81×（每世界 1.23MB，共享运行时开销摊薄）。
- RSS 有界无泄漏：N=10 39→峰值123(day8)→稳定104~112MB；每 2 天一轮墙钟恒 101~105s。
  原因是历史集合有界（rumorRetentionDays=3 / rumorCapacity=16384 / maxAnnalEntries=128 /
  Mind.Memory 上限），约 day4 后进入稳态。
- 两轮世界0 digest 一致（2364CB74…）→ 并存+并行不改变单世界语义。
- 数字未越界 → 明确「不修」；只读本 slice 不修 Kernel/Sim。

回归：Desktop 304/304 + Kernel 119/119；--performance-baseline ×3 digest
953775FAEB2F… 不变，performance_determinism=PASS。未 push。

9 files changed, 364 insertions, 1 deletions

diff --git a/artifacts/perf-multiworld/20260928T195839Z/README.md b/artifacts/perf-multiworld/20260928T195839Z/README.md
new file mode 100644
index 0000000..f5dc676
--- /dev/null
+++ b/artifacts/perf-multiworld/20260928T195839Z/README.md
@@ -0,0 +1,113 @@
+# P59 多世界并存压测结论（Sim 多世界 × 天数的内存/GC 增长曲线）
+
+- 日期：2026-09-28
+- 代码 commit：`2c559a7`（本 slice 起点；压测期间未改 Kernel/Sim）
+- 运行方式：独立 `systemd --user` transient unit `living-village-multiworld.service`
+  （wrapper `scripts/profile-multiworld.sh`，`StandardOutput=append:` + `exec 2>&1` 汇一个文件）
+- 证据：本目录 `acceptance.log`（主运行 N=10）、`control-n1.log`（控制组 N=1）、`state.json`
+- 只读结论，**未修改任何 Kernel/Sim 语义**；`--performance-baseline` ×3 digest 仍为
+  `953775FAEB2F…`，Kernel 119/119。
+
+## 口径
+
+`dotnet LivingVillage.Headless.dll --profile-multiworld <worlds> <days> <npcs> <sampleEveryDays> <seedBase>`
+
+- N 个 `Sim.initialWorldN(seedBase+i, 30)` 世界**同时存活**；
+- 按采样轮推进：每轮用 `Parallel.For` 让全部世界各前进 `sampleEveryDays` 天，随后采样一次；
+- 采样字段：`worlds`（并存世界数）、`events`、`rumors`、`annals`、`memory_entries`
+  （全部世界的聚合）、`gc_live_mb`（`GC.GetTotalMemory(true)`）、`working_set_rss_mb`
+  （`Process.WorkingSet64`）、`elapsed_s`；每行 flush；
+- ground truth 为 **gc_live 与 RSS**；条目计数只作解释用。
+
+### 标定探针（先跑）
+
+`--profile-multiworld 1 2`（1 世界 × 2 天）= **34.2s**，与 `docs/overnight-status.md`
+中 Hermes 单 worker 亲测 34.6s 一致。据此定 **N=10 × 20 天**（10 世界并行一轮约 100s）。
+
+## 主运行 N=10 × 20 天（12 天口径内的采样，`acceptance.log`）
+
+| day | rumors | annals | memory_entries | gc_live_mb | rss_mb | elapsed_s |
+|----:|------:|------:|--------------:|----------:|------:|---------:|
+| 0 | 0 | 0 | 0 | 0.12 | 39.05 | 0.0 |
+| 2 | 38536 | 1280 | 19200 | 7.28 | 74.61 | 101.0 |
+| 4 | 76353 | 1280 | 19200 | 12.19 | 91.55 | 206.1 |
+| 6 | 75488 | 1280 | 19200 | 12.09 | 102.58 | 309.6 |
+| 8 | 75737 | 1280 | 19200 | 12.13 | 123.10 | 412.4 |
+| 10 | 75667 | 1280 | 19200 | 12.11 | 106.71 | 514.9 |
+| 12 | 75908 | 1280 | 19200 | 12.15 | 112.00 | 616.9 |
+| 14 | 76017 | 1280 | 19200 | 12.16 | 110.58 | 719.2 |
+| 16 | 75334 | 1280 | 19200 | 12.06 | 111.41 | 820.4 |
+| 18 | 75907 | 1280 | 19200 | 12.15 | 105.52 | 922.5 |
+| 20 | 76687 | 1280 | 19200 | 12.25 | 103.96 | 1024.3 |
+
+wall = **1024.4s（≈17.1 min，< 40 min 预算）**，exit=0。
+
+## 控制组 N=1 × 20 天（`control-n1.log`）
+
+| day | rumors | annals | memory_entries | gc_live_mb | rss_mb | elapsed_s |
+|----:|------:|------:|--------------:|----------:|------:|---------:|
+| 2 | 3921 | 128 | 1920 | 0.85 | 57.19 | 34.0 |
+| 4 | 7843 | 128 | 1920 | 1.37 | 61.71 | 68.1 |
+| 20 | 7932 | 128 | 1920 | 1.39 | 67.94 | 339.0 |
+
+wall = 339.1s。世界 0 的 `world_digests=0:2364CB74F5FCA345…` 与 N=10 主运行的
+世界 0 **逐字节一致** → 并存 + 并行推进不改变单世界语义。
+
+## 结论
+
+### 1) 增长是否随世界数超线性？——否，近似线性（内存实为略次线性）
+
+以 N=1 与 N=10 同日（D=20）对比：
+
+| 量 | N=1 | N=10 | 倍率 |
+|---|---:|---:|---:|
+| rumors | 7932 | 76687 | 9.67× |
+| annals | 128 | 1280 | 10.00× |
+| memory_entries | 1920 | 19200 | 10.00× |
+| gc_live_mb | 1.39 | 12.25 | 8.81×（每世界 1.23MB） |
+| wall_s | 339 | 1024 | 3.02×（10× 工作量，16 核并行） |
+
+条目计数严格 ~N 倍；GC live set **略低于** N 倍（运行时/JIT/GC 堆共享的固定开销被摊薄）。
+**未观测到任何超线性增长**。
+
+### 2) RSS 是否有界？——有界，无单调泄漏
+
+- N=10：39MB → 峰值 123MB（day 8）→ 回落并稳定在 **104–112MB**，day 10 后不再上升。
+- N=1：39MB → day 4 后稳定在 **64–68MB**。
+- 时间维度上，10 世界每 2 天一轮墙钟恒为 **101–105s**（波动 <4%），说明 2–20 天窗口内
+  逐日成本**不随天数上升**——与早期 M3 phase2 在 100 天视野看到的逐日成本上升不同。
+
+原因（读码确认，非猜测，未改码）：三类历史集合均有界——
+`Sim.rumorRetentionDays = 3`（按天淘汰，`rumorCapacity = 16384`/世界）、
+`maxAnnalEntries = 128`、`Mind.Memory` 每 NPC 上限。因此 day ~4 后每条曲线进入稳态。
+
+`events` 全程为 0：自主模拟不产生 `InteractionEvent`（仅玩家交互写入），符合预期，非泄漏信号。
+
+### 3) 是否有建议的最小修复？——**不修**
+
+所有指标未越界：live set 有界、RSS 有界且回落、随 N 线性、无 NaN（判据门在 M3R 另测）。
+本 slice 只读，不改任何 Kernel/Sim。
+
+观察项（留档，不在本 slice 处理）：
+- M3 phase2 在 100 天视野的逐日成本上升未在 20 天窗口复现；若需定位需另设 >20 天采样。
+- 10 世界并行时单世界墙钟约为串行的 3.0×（GC/CPU 争用），16 核下仍远低于预算。
+
+## 复现
+
+```bash
+# 控制组（前台）
+dotnet src/LivingVillage.Headless/bin/Release/net8.0/LivingVillage.Headless.dll \
+  --profile-multiworld 1 20 30 2 42
+
+# 主运行（独立 systemd --user transient unit，见 deploy/living-village-multiworld.service）
+TS=$(date -u +%Y%m%dT%H%M%SZ)
+DIR=$PWD/artifacts/perf-multiworld/$TS
+systemd-run --user --unit=living-village-multiworld \
+  --property=Type=simple --property=WorkingDirectory=$PWD \
+  --setenv=PMW_REPO=$PWD --setenv=PMW_DIR=$DIR --setenv=PMW_COMMIT=2c559a7 \
+  --setenv=PMW_WORLDS=10 --setenv=PMW_DAYS=20 --setenv=PMW_NPCS=30 \
+  --setenv=PMW_SAMPLE_EVERY=2 --setenv=PMW_SEED_BASE=42 --setenv=PMW_LOG=$DIR/acceptance.log \
+  --property=StandardOutput=append:$DIR/acceptance.log \
+  --property=StandardError=append:$DIR/acceptance.log --property=Restart=no \
+  /usr/bin/bash $PWD/scripts/profile-multiworld.sh
+```
diff --git a/artifacts/perf-multiworld/20260928T195839Z/acceptance.log b/artifacts/perf-multiworld/20260928T195839Z/acceptance.log
new file mode 100644
index 0000000..8f6ac82
--- /dev/null
+++ b/artifacts/perf-multiworld/20260928T195839Z/acceptance.log
@@ -0,0 +1,15 @@
+[pmw] start unit=living-village-multiworld.service pid=165537 commit=2c559a7 worlds=10 days=20 npcs=30 sample_every=2 seed_base=42 started_at=2026-09-28T19:58:39Z
+multiworld_start worlds=10 days=20 npcs=30 sample_every_days=2 seed_base=42 ticks_per_day=5184000
+multiworld_sample worlds=10 day=0/20 events=0 rumors=0 annals=0 memory_entries=0 gc_live_mb=0.12 working_set_rss_mb=39.05 elapsed_s=0.0
+multiworld_sample worlds=10 day=2/20 events=0 rumors=38536 annals=1280 memory_entries=19200 gc_live_mb=7.28 working_set_rss_mb=74.61 elapsed_s=101.0
+multiworld_sample worlds=10 day=4/20 events=0 rumors=76353 annals=1280 memory_entries=19200 gc_live_mb=12.19 working_set_rss_mb=91.55 elapsed_s=206.1
+multiworld_sample worlds=10 day=6/20 events=0 rumors=75488 annals=1280 memory_entries=19200 gc_live_mb=12.09 working_set_rss_mb=102.58 elapsed_s=309.6
+multiworld_sample worlds=10 day=8/20 events=0 rumors=75737 annals=1280 memory_entries=19200 gc_live_mb=12.13 working_set_rss_mb=123.10 elapsed_s=412.4
+multiworld_sample worlds=10 day=10/20 events=0 rumors=75667 annals=1280 memory_entries=19200 gc_live_mb=12.11 working_set_rss_mb=106.71 elapsed_s=514.9
+multiworld_sample worlds=10 day=12/20 events=0 rumors=75908 annals=1280 memory_entries=19200 gc_live_mb=12.15 working_set_rss_mb=112.00 elapsed_s=616.9
+multiworld_sample worlds=10 day=14/20 events=0 rumors=76017 annals=1280 memory_entries=19200 gc_live_mb=12.16 working_set_rss_mb=110.58 elapsed_s=719.2
+multiworld_sample worlds=10 day=16/20 events=0 rumors=75334 annals=1280 memory_entries=19200 gc_live_mb=12.06 working_set_rss_mb=111.41 elapsed_s=820.4
+multiworld_sample worlds=10 day=18/20 events=0 rumors=75907 annals=1280 memory_entries=19200 gc_live_mb=12.15 working_set_rss_mb=105.52 elapsed_s=922.5
+multiworld_sample worlds=10 day=20/20 events=0 rumors=76687 annals=1280 memory_entries=19200 gc_live_mb=12.25 working_set_rss_mb=103.96 elapsed_s=1024.3
+multiworld_done worlds=10 day=20 elapsed_s=1024.4 world_digests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
+[pmw] end pid=165537 exit=0 ended_at=2026-09-28T20:15:43Z
diff --git a/artifacts/perf-multiworld/20260928T195839Z/control-n1.log b/artifacts/perf-multiworld/20260928T195839Z/control-n1.log
new file mode 100644
index 0000000..88fe297
--- /dev/null
+++ b/artifacts/perf-multiworld/20260928T195839Z/control-n1.log
@@ -0,0 +1,13 @@
+multiworld_start worlds=1 days=20 npcs=30 sample_every_days=2 seed_base=42 ticks_per_day=5184000
+multiworld_sample worlds=1 day=0/20 events=0 rumors=0 annals=0 memory_entries=0 gc_live_mb=0.09 working_set_rss_mb=38.83 elapsed_s=0.0
+multiworld_sample worlds=1 day=2/20 events=0 rumors=3921 annals=128 memory_entries=1920 gc_live_mb=0.85 working_set_rss_mb=57.19 elapsed_s=34.0
+multiworld_sample worlds=1 day=4/20 events=0 rumors=7843 annals=128 memory_entries=1920 gc_live_mb=1.37 working_set_rss_mb=61.71 elapsed_s=68.1
+multiworld_sample worlds=1 day=6/20 events=0 rumors=7849 annals=128 memory_entries=1920 gc_live_mb=1.38 working_set_rss_mb=63.63 elapsed_s=101.9
+multiworld_sample worlds=1 day=8/20 events=0 rumors=7925 annals=128 memory_entries=1920 gc_live_mb=1.39 working_set_rss_mb=64.29 elapsed_s=135.8
+multiworld_sample worlds=1 day=10/20 events=0 rumors=7723 annals=128 memory_entries=1920 gc_live_mb=1.37 working_set_rss_mb=64.57 elapsed_s=169.6
+multiworld_sample worlds=1 day=12/20 events=0 rumors=7727 annals=128 memory_entries=1920 gc_live_mb=1.37 working_set_rss_mb=64.92 elapsed_s=203.6
+multiworld_sample worlds=1 day=14/20 events=0 rumors=8038 annals=128 memory_entries=1920 gc_live_mb=1.41 working_set_rss_mb=67.88 elapsed_s=237.2
+multiworld_sample worlds=1 day=16/20 events=0 rumors=7953 annals=128 memory_entries=1920 gc_live_mb=1.40 working_set_rss_mb=67.88 elapsed_s=271.2
+multiworld_sample worlds=1 day=18/20 events=0 rumors=7901 annals=128 memory_entries=1920 gc_live_mb=1.39 working_set_rss_mb=67.89 elapsed_s=305.2
+multiworld_sample worlds=1 day=20/20 events=0 rumors=7932 annals=128 memory_entries=1920 gc_live_mb=1.39 working_set_rss_mb=67.94 elapsed_s=339.0
+multiworld_done worlds=1 day=20 elapsed_s=339.1 world_digests=0:2364CB74F5FCA34503269F413F7184F455006C9975EB01B11219D25A3A33FDD2
diff --git a/artifacts/perf-multiworld/20260928T195839Z/state.json b/artifacts/perf-multiworld/20260928T195839Z/state.json
new file mode 100644
index 0000000..3ead223
--- /dev/null
+++ b/artifacts/perf-multiworld/20260928T195839Z/state.json
@@ -0,0 +1,16 @@
+{
+  "commit": "2c559a7",
+  "ended_at": "2026-09-28T20:15:43Z",
+  "exit": 0,
+  "log": "/home/somhairle/projects/living-village/artifacts/perf-multiworld/20260928T195839Z/acceptance.log",
+  "params": {
+    "days": 20,
+    "npcs": 30,
+    "sample_every_days": 2,
+    "seed_base": 42,
+    "worlds": 10
+  },
+  "pid": 165537,
+  "started_at": "2026-09-28T19:58:39Z",
+  "unit": "living-village-multiworld.service"
+}
diff --git a/deploy/living-village-multiworld.service b/deploy/living-village-multiworld.service
new file mode 100644
index 0000000..a16544d
--- /dev/null
+++ b/deploy/living-village-multiworld.service
@@ -0,0 +1,40 @@
+# P59 多世界并存压测 systemd --user 单元模板（N 世界 × D 天，逐采样行流式）。
+#
+# 独立于 writer cgroup 运行（transient unit），输出 append 到 acceptance.log、exec 2>&1。
+# 安装示例：
+#   TS=$(date -u +%Y%m%dT%H%M%SZ)
+#   systemd-run --user --unit=living-village-multiworld \
+#     --property=Type=simple \
+#     --property=WorkingDirectory=@REPO@ \
+#     --setenv=PMW_REPO=@REPO@ \
+#     --setenv=PMW_DIR=@REPO@/artifacts/perf-multiworld/$TS \
+#     --setenv=PMW_COMMIT=@COMMIT@ \
+#     --setenv=PMW_WORLDS=10 --setenv=PMW_DAYS=20 --setenv=PMW_NPCS=30 \
+#     --setenv=PMW_SAMPLE_EVERY=2 --setenv=PMW_SEED_BASE=42 \
+#     --setenv=PMW_LOG=@REPO@/artifacts/perf-multiworld/$TS/acceptance.log \
+#     --property=StandardOutput=append:@REPO@/artifacts/perf-multiworld/$TS/acceptance.log \
+#     --property=StandardError=append:@REPO@/artifacts/perf-multiworld/$TS/acceptance.log \
+#     --property=Restart=no \
+#     /usr/bin/bash @REPO@/scripts/profile-multiworld.sh
+[Unit]
+Description=Living Village multi-world coexistence memory/GC profile
+After=default.target
+
+[Service]
+Type=simple
+WorkingDirectory=@REPO@
+Environment=PMW_REPO=@REPO@
+Environment=PMW_DIR=@REPO@/artifacts/perf-multiworld/@TS@
+Environment=PMW_COMMIT=@COMMIT@
+Environment=PMW_WORLDS=10
+Environment=PMW_DAYS=20
+Environment=PMW_NPCS=30
+Environment=PMW_SAMPLE_EVERY=2
+Environment=PMW_SEED_BASE=42
+Environment=PMW_LOG=@REPO@/artifacts/perf-multiworld/@TS@/acceptance.log
+ExecStart=/usr/bin/bash @REPO@/scripts/profile-multiworld.sh
+StandardOutput=append:@REPO@/artifacts/perf-multiworld/@TS@/acceptance.log
+StandardError=append:@REPO@/artifacts/perf-multiworld/@TS@/acceptance.log
+Restart=no
+TimeoutStartSec=infinity
+TimeoutStopSec=30s
diff --git a/scripts/profile-multiworld.sh b/scripts/profile-multiworld.sh
new file mode 100755
index 0000000..3ab099d
--- /dev/null
+++ b/scripts/profile-multiworld.sh
@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+# P59 多世界并存后台压测 MasterProcess（systemd --user transient unit 的 ExecStart）。
+#
+# 职责：
+#   * 在 <PMW_DIR> 落 state.json（pid/unit/log/commit/参数/起止/exit）；
+#   * 以 2>&1 运行 Headless `--profile-multiworld N D npcs sampleEvery seedBase`，
+#     逐采样行流式打印并 flush；
+#   * 退出时写回 ended_at/exit，并回传真实退出码。
+#
+# 环境变量（由 unit/transient 属性注入）：
+#   PMW_REPO / PMW_DIR / PMW_COMMIT / PMW_LOG
+#   PMW_WORLDS（默认 10）/ PMW_DAYS（默认 20）/ PMW_NPCS（默认 30）
+#   PMW_SAMPLE_EVERY（默认 2）/ PMW_SEED_BASE（默认 42）
+set -u
+
+REPO="${PMW_REPO:?PMW_REPO required}"
+DIR="${PMW_DIR:?PMW_DIR required}"
+COMMIT="${PMW_COMMIT:?PMW_COMMIT required}"
+WORLDS="${PMW_WORLDS:-10}"
+DAYS="${PMW_DAYS:-20}"
+NPCS="${PMW_NPCS:-30}"
+SAMPLE_EVERY="${PMW_SAMPLE_EVERY:-2}"
+SEED_BASE="${PMW_SEED_BASE:-42}"
+LOG="${PMW_LOG:-$REPO/artifacts/perf-multiworld/latest/acceptance.log}"
+UNIT="living-village-multiworld.service"
+DLL="$REPO/src/LivingVillage.Headless/bin/Release/net8.0/LivingVillage.Headless.dll"
+
+mkdir -p "$DIR"
+if [ ! -f "$DLL" ]; then
+    echo "[pmw] FATAL missing build: $DLL" >&2
+    exit 90
+fi
+
+STARTED="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+echo "$$" > "$DIR/pid"
+echo "[pmw] start unit=$UNIT pid=$$ commit=$COMMIT worlds=$WORLDS days=$DAYS npcs=$NPCS sample_every=$SAMPLE_EVERY seed_base=$SEED_BASE started_at=$STARTED"
+
+python3 - "$DIR/state.json" "$UNIT" "$COMMIT" "$WORLDS" "$DAYS" "$NPCS" "$SAMPLE_EVERY" "$SEED_BASE" "$LOG" "$STARTED" "$$" <<'PY'
+import json, sys
+out, unit, commit, worlds, days, npcs, sample, seed, log, started, pid = sys.argv[1:12]
+state = {
+    "pid": int(pid),
+    "unit": unit,
+    "log": log,
+    "commit": commit,
+    "params": {
+        "worlds": int(worlds),
+        "days": int(days),
+        "npcs": int(npcs),
+        "sample_every_days": int(sample),
+        "seed_base": int(seed),
+    },
+    "started_at": started,
+    "ended_at": None,
+    "exit": None,
+}
+with open(out, "w", encoding="utf-8") as fh:
+    json.dump(state, fh, ensure_ascii=False, indent=2, sort_keys=True)
+    fh.write("\n")
+PY
+
+( exec dotnet "$DLL" --profile-multiworld "$WORLDS" "$DAYS" "$NPCS" "$SAMPLE_EVERY" "$SEED_BASE" 2>&1 )
+CODE=$?
+
+ENDED="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+echo "[pmw] end pid=$$ exit=$CODE ended_at=$ENDED"
+
+python3 - "$DIR/state.json" "$CODE" "$ENDED" <<'PY'
+import json, sys
+path, code, ended = sys.argv[1:4]
+with open(path, encoding="utf-8") as fh:
+    state = json.load(fh)
+state["ended_at"] = ended
+state["exit"] = int(code)
+with open(path, "w", encoding="utf-8") as fh:
+    json.dump(state, fh, ensure_ascii=False, indent=2, sort_keys=True)
+    fh.write("\n")
+PY
+
+exit "$CODE"
diff --git a/src/LivingVillage.Desktop.Tests/M3BatchOutputTests.fs b/src/LivingVillage.Desktop.Tests/M3BatchOutputTests.fs
index b1822c7..963d571 100644
--- a/src/LivingVillage.Desktop.Tests/M3BatchOutputTests.fs
+++ b/src/LivingVillage.Desktop.Tests/M3BatchOutputTests.fs
@@ -32,6 +32,13 @@ type M3BatchOutputTests () =
         Assert.AreEqual<string>("[world 0] progress day=15/15 elapsed=260.0s", BatchOutput.progressLine 0 15L 15L 260.0)
 
     [<TestMethod>]
+    member _.MultiworldLineReportsCountsGcRssAndElapsed () =
+        let line = BatchOutput.multiworldLine 8 4L 20L 1600L 32000L 64L 5120L (1048576L * 96L) (1048576L * 240L) 31.5
+        Assert.AreEqual<string>(
+            "multiworld_sample worlds=8 day=4/20 events=1600 rumors=32000 annals=64 memory_entries=5120 gc_live_mb=96.00 working_set_rss_mb=240.00 elapsed_s=31.5",
+            line)
+
+    [<TestMethod>]
     member _.SummaryLineKeepsOldFieldsAndAppendsWallClock () =
         let line = BatchOutput.summaryLine 4 3 1 4 1.100 9.900 0.010 0.400 4 610.5
         // 监督器正则只读前三个字段，前缀必须逐字保持。
diff --git a/src/LivingVillage.Headless/BatchOutput.fs b/src/LivingVillage.Headless/BatchOutput.fs
index 971da97..aa79391 100644
--- a/src/LivingVillage.Headless/BatchOutput.fs
+++ b/src/LivingVillage.Headless/BatchOutput.fs
@@ -42,6 +42,23 @@ module BatchOutput =
             "batch_summary worlds=%d passed=%d failed=%d old_passed=%d/%d ratio_min=%.3f ratio_max=%.3f gini_min=%.3f gini_max=%.3f elapsed_s=%.1f workers=%d wall_s=%.1f"
             worlds passed failed oldPassed worlds ratioMin ratioMax giniMin giniMax elapsedSeconds workers elapsedSeconds
 
+    /// 多世界并存压测采样行：worlds/day 与各历史集合计数 + GC live set + OS RSS + 墙钟。
+    let multiworldLine
+        (worlds: int)
+        (day: int64)
+        (totalDays: int64)
+        (events: int64)
+        (rumors: int64)
+        (annals: int64)
+        (memoryEntries: int64)
+        (gcLiveBytes: int64)
+        (rssBytes: int64)
+        (elapsedSeconds: float) : string =
+        let mb (bytes: int64) = float bytes / (1024.0 * 1024.0)
+        sprintf
+            "multiworld_sample worlds=%d day=%d/%d events=%d rumors=%d annals=%d memory_entries=%d gc_live_mb=%.2f working_set_rss_mb=%.2f elapsed_s=%.1f"
+            worlds day totalDays events rumors annals memoryEntries (mb gcLiveBytes) (mb rssBytes) elapsedSeconds
+
     /// --cost-probe 单段输出：ticks/s、墙钟、分配与 GC 全部来自真实测量。
     let costLine
         (days: int64)
diff --git a/src/LivingVillage.Headless/Program.fs b/src/LivingVillage.Headless/Program.fs
index 4bd6424..c9dd442 100644
--- a/src/LivingVillage.Headless/Program.fs
+++ b/src/LivingVillage.Headless/Program.fs
@@ -612,6 +612,66 @@ let runProfileLongRun (argv: string[]) : int =
     Console.Out.Flush()
     if world.Tick = days * ticksPerDay then 0 else 1
 
+/// `--profile-multiworld [worlds] [days] [npcs] [sampleEveryDays] [seedBase]`：
+/// N 个 Sim 世界并存、按采样轮并行推进 D 天（只读 profile，不改 Kernel/Sim 语义）。
+/// 每 `sampleEveryDays` 天打印一行流式采样（worlds/count、events、rumors、annals、
+/// memory_entries、gc_live_mb、working_set_rss_mb、elapsed_s）并 flush；行的聚合口径为
+/// 全部并存世界之和，ground truth 是 GC live set 与 OS WorkingSet。
+let runProfileMultiworld (argv: string[]) : int =
+    let argInt64 index (dflt: int64) =
+        if argv.Length > index then
+            match Int64.TryParse argv.[index] with
+            | true, v when v > 0L -> v
+            | _ -> dflt
+        else dflt
+    let worlds = int (argInt64 1 10L)
+    let days = argInt64 2 20L
+    let npcs = int (argInt64 3 (int64 Sim.npcCount))
+    let sampleEvery = argInt64 4 2L
+    let seedBase = if argv.Length > 5 then (match UInt64.TryParse argv.[5] with | true, v -> v | _ -> 42UL) else 42UL
+    let proc = System.Diagnostics.Process.GetCurrentProcess()
+    printfn "multiworld_start worlds=%d days=%d npcs=%d sample_every_days=%d seed_base=%d ticks_per_day=%d"
+        worlds days npcs sampleEvery seedBase ticksPerDay
+    Console.Out.Flush()
+    let ws = Array.init worlds (fun i -> Sim.initialWorldN (seedBase + uint64 i) npcs)
+    let drivers = Array.init worlds (fun i -> { Rng = Rng.ofSeed (seedBase + uint64 i); Until = segmentTicks; Input = zeroInput })
+    let sw = System.Diagnostics.Stopwatch.StartNew()
+    let advanceOne (i: int) (targetDay: int64) =
+        let mutable world = ws.[i]
+        let mutable driver = drivers.[i]
+        let dayEnd = targetDay * ticksPerDay
+        while world.Tick < dayEnd do
+            let d, input =
+                if world.Tick < driver.Until then driver, driver.Input
+                else
+                    let d = nextSegment driver.Rng driver.Until
+                    d, d.Input
+            driver <- d
+            world <- Sim.step { Input = input } world
+        ws.[i] <- world
+        drivers.[i] <- driver
+    let sample (day: int64) =
+        let gcLive = System.GC.GetTotalMemory true
+        proc.Refresh()
+        let rss = proc.WorkingSet64
+        let events = ws |> Array.sumBy (fun w -> int64 w.Events.Length)
+        let rumors = ws |> Array.sumBy (fun w -> int64 w.Rumors.Length)
+        let annals = ws |> Array.sumBy (fun w -> int64 w.Annals.Length)
+        let memEntries = ws |> Array.sumBy (fun w -> int64 (w.Npcs |> Array.sumBy (fun n -> n.Mind.Memory.Length)))
+        printfn "%s" (LivingVillage.Headless.BatchOutput.multiworldLine worlds day days events rumors annals memEntries gcLive rss sw.Elapsed.TotalSeconds)
+        Console.Out.Flush()
+    sample 0L
+    let mutable dayNo = 0L
+    while dayNo < days do
+        let target = min days (dayNo + sampleEvery)
+        System.Threading.Tasks.Parallel.For(0, worlds, fun i -> advanceOne i target) |> ignore
+        dayNo <- target
+        sample dayNo
+    let digests = ws |> Array.mapi (fun i w -> sprintf "%d:%s" i (LivingVillage.Headless.PerformanceProbe.worldDigest w)) |> String.concat ","
+    printfn "multiworld_done worlds=%d day=%d elapsed_s=%.1f world_digests=%s" worlds dayNo sw.Elapsed.TotalSeconds digests
+    Console.Out.Flush()
+    if ws |> Array.forall (fun w -> w.Tick = days * ticksPerDay) then 0 else 1
+
 let runExisting (argv: string[]) =
     let rec parse
         (i: int)
@@ -675,7 +735,7 @@ let runExisting (argv: string[]) =
             if stats.NonFinite > 0L || stats.OutOfBounds > 0L || not replayOk then 1 else 0
     | Error msg ->
         eprintfn $"headless: {msg}"
-        eprintfn "usage: dotnet run -c Release --project src/LivingVillage.Headless -- --days N --seed S [--npc N] [--dump-relations] [--dump-rumors] [--replay-rumors] | --m5-smoke | --m6a-smoke | --batch K D | --performance-baseline | --cost-probe [D1,D2,...] | --rumor-bench [days npcs chats_per_day]"
+        eprintfn "usage: dotnet run -c Release --project src/LivingVillage.Headless -- --days N --seed S [--npc N] [--dump-relations] [--dump-rumors] [--replay-rumors] | --m5-smoke | --m6a-smoke | --batch K D | --performance-baseline | --cost-probe [D1,D2,...] | --rumor-bench [days npcs chats_per_day] | --profile-long-run [days sampleEveryDays npcs seed] | --profile-multiworld [worlds days npcs sampleEveryDays seedBase]"
         2
 
 let private parseCostLadder (argv: string[]) : int64 list =
@@ -706,5 +766,7 @@ let main argv =
         runRumorBench argv
     elif argv.Length >= 1 && argv.[0] = "--profile-long-run" then
         runProfileLongRun argv
+    elif argv.Length >= 1 && argv.[0] = "--profile-multiworld" then
+        runProfileMultiworld argv
     else
         runExisting argv