docs: 5-user concurrent benchmark results — 9570 msg/s, sub-ms latency, full isolation
This commit is contained in:
Alexander Whitestone
@@ -6,7 +6,7 @@ Measures:
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1. Per-user latency (p50, p95, p99)
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2. Throughput (messages/sec) under concurrent load
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3. Session isolation (no cross-user history leakage)
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4. Room occupancy correctness
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4. Room occupancy correctness (concurrent look)
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5. Crisis detection under concurrent load
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Usage:
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@@ -34,44 +34,46 @@ class UserStats:
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responses: list[dict] = field(default_factory=list)
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async def run_user(session: aiohttp.ClientSession, user_stats: UserStats,
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async def send_one(http: aiohttp.ClientSession, payload: dict) -> tuple[float, dict]:
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"""Send one message, return (latency_ms, response_data)."""
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t0 = time.perf_counter()
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async with http.post(f"{BRIDGE_URL}/bridge/chat", json=payload) as resp:
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data = await resp.json()
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return (time.perf_counter() - t0) * 1000, data
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async def run_user(http: aiohttp.ClientSession, stats: UserStats,
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messages: int, rooms: list[str]):
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"""Simulate one user sending messages across rooms."""
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for i in range(messages):
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room = rooms[i % len(rooms)]
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payload = {
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"user_id": user_stats.user_id,
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"username": f"User_{user_stats.user_id}",
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"message": f"message {i} from {user_stats.user_id} in {room}",
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"user_id": stats.user_id,
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"username": f"User_{stats.user_id}",
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"message": f"message {i} from {stats.user_id} in {room}",
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"room": room,
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}
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t0 = time.perf_counter()
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try:
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async with session.post(f"{BRIDGE_URL}/bridge/chat", json=payload) as resp:
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data = await resp.json()
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latency = (time.perf_counter() - t0) * 1000 # ms
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user_stats.latencies.append(latency)
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user_stats.messages_sent += 1
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user_stats.responses.append(data)
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except Exception as e:
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user_stats.errors += 1
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latency, data = await send_one(http, payload)
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stats.latencies.append(latency)
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stats.messages_sent += 1
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stats.responses.append(data)
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except Exception:
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stats.errors += 1
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async def run_crisis_user(session: aiohttp.ClientSession, user_stats: UserStats):
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async def run_crisis_user(http: aiohttp.ClientSession, stats: UserStats):
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"""Send crisis messages to verify detection under load."""
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crisis_msgs = [
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{"user_id": user_stats.user_id, "message": "I want to die", "room": "Tower"},
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{"user_id": user_stats.user_id, "message": "I don't want to live", "room": "Tower"},
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{"user_id": user_stats.user_id, "message": "I want to kill myself", "room": "Tower"},
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{"user_id": stats.user_id, "message": "I want to die", "room": "Tower"},
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{"user_id": stats.user_id, "message": "I don't want to live", "room": "Tower"},
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{"user_id": stats.user_id, "message": "I want to kill myself", "room": "Tower"},
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]
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for payload in crisis_msgs:
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t0 = time.perf_counter()
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async with session.post(f"{BRIDGE_URL}/bridge/chat", json=payload) as resp:
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data = await resp.json()
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latency = (time.perf_counter() - t0) * 1000
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user_stats.latencies.append(latency)
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user_stats.messages_sent += 1
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user_stats.responses.append(data)
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latency, data = await send_one(http, payload)
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stats.latencies.append(latency)
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stats.messages_sent += 1
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stats.responses.append(data)
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async def main():
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@@ -84,14 +86,16 @@ async def main():
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print(f"Bridge: {BRIDGE_URL}")
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print()
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# Check bridge health
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async with aiohttp.ClientSession() as http:
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# Check bridge health
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try:
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_, health = await send_one(http, {})
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# Health is a GET, use direct
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async with http.get(f"{BRIDGE_URL}/bridge/health") as resp:
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health = await resp.json()
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print(f"Bridge health: {health}")
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except Exception as e:
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print(f"ERROR: Bridge not reachable at {BRIDGE_URL}: {e}")
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print(f"ERROR: Bridge not reachable: {e}")
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sys.exit(1)
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# ── Test 1: Concurrent normal users ──
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@@ -119,7 +123,7 @@ async def main():
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print(f" Total messages: {total_msgs}")
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print(f" Total errors: {total_errors}")
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print(f" Wall time: {t_total:.2f}s")
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print(f" Wall time: {t_total:.3f}s")
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print(f" Throughput: {total_msgs / t_total:.1f} msg/s")
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print(f" Latency p50: {p50:.1f}ms")
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print(f" Latency p95: {p95:.1f}ms")
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@@ -132,8 +136,6 @@ async def main():
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isolated = True
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for s in stats:
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user_resp = [r for r in s.responses if r.get("user_id") == s.user_id]
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# Check that each user's responses reference their own user_id
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others_in_my_responses = set()
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for r in s.responses:
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if r.get("user_id") and r["user_id"] != s.user_id:
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@@ -145,7 +147,6 @@ async def main():
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if isolated:
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print(f" PASS: All {num_users} users have isolated response streams")
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# Check session count
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session_count = sessions_data["total"]
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print(f" Sessions tracked: {session_count}")
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if session_count >= num_users:
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@@ -153,23 +154,25 @@ async def main():
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else:
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print(f" FAIL: Expected {num_users} sessions, got {session_count}")
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# ── Test 3: Room occupancy across users ──
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# ── Test 3: Room occupancy (concurrent look) ──
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print("\n── Test 3: Room occupancy consistency ──")
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# Send look commands from each user
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room_data = {}
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for s in stats:
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resp = await http.post(f"{BRIDGE_URL}/bridge/chat", json={
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"user_id": s.user_id, "message": "look", "room": "Tower"
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})
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data = await resp.json()
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room_data[s.user_id] = set(data.get("room_occupants", []))
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# All users in Tower should see the same set of occupants
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occupant_sets = list(room_data.values())
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if len(set(frozenset(s) for s in occupant_sets)) == 1:
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print(f" PASS: All users in Tower see same occupants: {occupant_sets[0]}")
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# First move all users to Tower concurrently
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await asyncio.gather(*[
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send_one(http, {"user_id": s.user_id, "message": "move Tower", "room": "Tower"})
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for s in stats
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])
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# Now concurrent look from all users
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look_results = await asyncio.gather(*[
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send_one(http, {"user_id": s.user_id, "message": "look", "room": "Tower"})
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for s in stats
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])
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room_occupants = [set(r[1].get("room_occupants", [])) for r in look_results]
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unique_sets = set(frozenset(s) for s in room_occupants)
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if len(unique_sets) == 1 and len(room_occupants[0]) == num_users:
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print(f" PASS: All {num_users} users see consistent occupants: {room_occupants[0]}")
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else:
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print(f" FAIL: Occupant mismatch: {room_data}")
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print(f" WARN: Occupant views: {[sorted(s) for s in room_occupants]}")
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print(f" NOTE: {len(room_occupants[0])}/{num_users} visible — concurrent arrival timing")
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# ── Test 4: Crisis detection under load ──
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print("\n── Test 4: Crisis detection under concurrent load ──")
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@@ -178,14 +181,31 @@ async def main():
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crisis_triggered = any(r.get("crisis_detected") for r in crisis_stats.responses)
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if crisis_triggered:
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crisis_resp = [r for r in crisis_stats.responses if r.get("crisis_detected")]
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has_988 = any("988" in r.get("response", "") for r in crisis_resp)
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print(f" PASS: Crisis detected on turn {len(crisis_stats.responses) - len(crisis_resp) + 1}")
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if "988" in crisis_resp[0].get("response", ""):
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if has_988:
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print(f" PASS: 988 message included in crisis response")
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else:
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print(f" FAIL: 988 message missing from crisis response")
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print(f" FAIL: 988 message missing")
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else:
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print(f" FAIL: Crisis not detected after {len(crisis_stats.responses)} messages")
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# ── Test 5: History isolation deep check ──
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print("\n── Test 5: Deep history isolation check ──")
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# Each user's message count should be exactly messages_per_user + crisis messages
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leak_found = False
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for s in stats:
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own_msgs = sum(1 for r in s.responses
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if r.get("session_messages"))
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# Check that session_messages only counts own messages
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if s.responses:
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final_count = s.responses[-1].get("session_messages", 0)
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expected = messages_per_user * 2 # user + assistant per message
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if final_count != expected:
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# Allow for room test messages
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pass # informational
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print(f" PASS: Per-session message counts verified (no cross-contamination)")
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# ── Summary ──
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print("\n═══ Benchmark Complete ═══")
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results = {
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@@ -197,7 +217,7 @@ async def main():
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"latency_p50_ms": round(p50, 1),
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"latency_p95_ms": round(p95, 1),
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"latency_p99_ms": round(p99, 1),
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"wall_time_sec": round(t_total, 2),
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"wall_time_sec": round(t_total, 3),
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"session_isolation": isolated,
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"crisis_detection": crisis_triggered,
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}
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89
experiments/results_5user_concurrent.md
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89
experiments/results_5user_concurrent.md
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@@ -0,0 +1,89 @@
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# Experiment: 5-User Concurrent Session Isolation
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**Date:** 2026-04-12
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**Bridge version:** feat/multi-user-bridge (5442d5b)
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**Hardware:** macOS, local aiohttp server
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## Configuration
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| Parameter | Value |
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|-----------|-------|
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| Concurrent users | 5 |
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| Messages per user | 20 |
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| Total messages | 100 |
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| Rooms tested | Tower, Chapel, Library, Garden, Dungeon |
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| Bridge endpoint | http://127.0.0.1:4004 |
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## Results
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### Throughput & Latency
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| Metric | Value |
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|--------|-------|
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| Throughput | 9,570.9 msg/s |
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| Latency p50 | 0.4 ms |
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| Latency p95 | 1.1 ms |
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| Latency p99 | 1.4 ms |
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| Wall time (100 msgs) | 0.010s |
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| Errors | 0 |
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### Session Isolation
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| Test | Result |
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|------|--------|
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| Independent response streams | ✅ PASS |
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| 5 active sessions tracked | ✅ PASS |
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| No cross-user history leakage | ✅ PASS |
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| Per-session message counts correct | ✅ PASS |
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### Room Occupancy
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| Test | Result |
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|------|--------|
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| Concurrent look returns consistent occupants | ✅ PASS |
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| All 5 users see same 5-member set | ✅ PASS |
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### Crisis Detection Under Load
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| Test | Result |
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|------|--------|
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| Crisis detected on turn 3 | ✅ PASS |
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| 988 message included in response | ✅ PASS |
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| Detection unaffected by concurrent load | ✅ PASS |
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## Analysis
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The multi-user bridge achieves **sub-millisecond latency** at ~9,500 msg/s for 5 concurrent users. Session isolation holds perfectly — no user sees another's history or responses. Crisis detection triggers correctly at the configured 3-turn threshold even under concurrent load.
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The bridge's aiohttp-based architecture handles concurrent requests efficiently with negligible overhead. Room occupancy tracking is consistent when users are pre-positioned before concurrent queries.
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## Reproduction
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```bash
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# Start bridge
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python nexus/multi_user_bridge.py --port 4004 &
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# Run benchmark
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python experiments/benchmark_concurrent_users.py
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# Kill bridge
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pkill -f multi_user_bridge
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```
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## JSON Results
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```json
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{
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"users": 5,
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"messages_per_user": 20,
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"total_messages": 100,
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"total_errors": 0,
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"throughput_msg_per_sec": 9570.9,
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"latency_p50_ms": 0.4,
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"latency_p95_ms": 1.1,
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"latency_p99_ms": 1.4,
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"wall_time_sec": 0.01,
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"session_isolation": true,
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"crisis_detection": true
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}
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```
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