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070 CONCURRENT AGENT LIFECYCLE FLOWS

Documentation for 070_CONCURRENT_AGENT_LIFECYCLE_FLOWS from the Foundation repository.

Concurrent Agent Lifecycle Data Flows

Diagram 1: Multi-Agent Startup Cascade (Concurrent Flow)

--- title: "Concurrent Agent Initialization - Time Flow Visualization" --- gantt title Agent System Startup - Concurrent Timeline dateFormat X axisFormat %L section Registry_Init Registry GenServer Start :milestone, r1, 0, 0ms Registry ETS Tables :r2, after r1, 5ms Registry Ready Signal :milestone, r3, after r2, 0ms section Supervisor_Init AgentSupervisor Start :milestone, s1, 0, 0ms DynamicSupervisor Ready :s2, after s1, 8ms Tracking Tables Init :s3, after s1, 3ms Supervisor Ready Signal :milestone, s4, after s2, 0ms section Agent_Burst_1 Agent_A Config Load :a1, after r3, 2ms Agent_A Process Spawn :a2, after a1, 1ms Agent_A Registry Insert :a3, after a2, 1ms Agent_A Ready Signal :milestone, a4, after a3, 0ms section Agent_Burst_2 Agent_B Config Load :b1, after r3, 3ms Agent_B Process Spawn :b2, after b1, 1ms Agent_B Registry Insert :b3, after b2, 1ms Agent_B Ready Signal :milestone, b4, after b3, 0ms section Agent_Burst_3 Agent_C Config Load :c1, after r3, 4ms Agent_C Process Spawn :c2, after c1, 1ms Agent_C Registry Insert :c3, after c2, 1ms Agent_C Ready Signal :milestone, c4, after c3, 0ms section Coordination_Layer MABEAM Coord Start :coord1, after s4, 2ms Agent Discovery Scan :coord2, after coord1, 3ms Capability Map Build :coord3, after coord2, 2ms System Ready Signal :milestone, coord4, after coord3, 0ms

Concurrent Flow Analysis:

  • Parallel Initialization: Registry and Supervisor start simultaneously (0ms)
  • Agent Burst Pattern: Agents A,B,C start at different offsets but overlap in execution
  • Dependency Chains: Each agent waits for registry readiness before proceeding
  • Coordination Lag: MABEAM coordination starts after supervisor but scans during agent startup
  • Total System Ready: ~15ms with full concurrency vs ~45ms sequential

Diagram 2: Agent Message Flow Patterns (Live System)

flowchart TB subgraph "Time=T0: Message Storm Arrives" Ext1[External Request 1] -.->|async| Queue1[Message Queue 1] Ext2[External Request 2] -.->|async| Queue2[Message Queue 2] Ext3[External Request 3] -.->|async| Queue3[Message Queue 3] Ext4[External Request 4] -.->|async| Queue4[Message Queue 4] end subgraph "Time=T1: Registry Lookup Burst" Queue1 -.->|lookup agent_a| Reg{ProcessRegistry} Queue2 -.->|lookup agent_b| Reg Queue3 -.->|lookup agent_c| Reg Queue4 -.->|lookup agent_a| Reg Reg -.->|ETS scan| ETS[(ETS Table)] Reg -.->|Registry query| RegNative[Native Registry] ETS -.->|result| Cache1[PID Cache A] RegNative -.->|result| Cache2[PID Cache B] ETS -.->|result| Cache3[PID Cache C] RegNative -.->|result| Cache1 end subgraph "Time=T2: Concurrent Agent Processing" Cache1 -.->|route| Agent_A((Agent A Process)) Cache2 -.->|route| Agent_B((Agent B Process)) Cache3 -.->|route| Agent_C((Agent C Process)) Agent_A -.->|working| Work_A[Task A1] Agent_A -.->|working| Work_A2[Task A2] Agent_B -.->|working| Work_B[Task B1] Agent_C -.->|working| Work_C[Task C1] end subgraph "Time=T3: Cross-Agent Coordination" Work_A -.->|needs coordination| Coord{MABEAM Coordinator} Work_B -.->|capability query| Coord Work_C -.->|resource request| Coord Coord -.->|broadcast| Agent_A Coord -.->|assign task| Agent_B Coord -.->|resource grant| Agent_C Agent_A -.->|collaborate| Agent_B Agent_B -.->|result| Agent_C Agent_C -.->|aggregate| Final[Final Result] end subgraph "Time=T4: Response Propagation" Final -.->|response| Queue1 Work_A2 -.->|response| Queue4 Agent_B -.->|response| Queue2 Agent_C -.->|response| Queue3 end classDef concurrent fill:#e1f5fe,stroke:#01579b classDef hot fill:#fff3e0,stroke:#ef6c00 classDef coordination fill:#f3e5f5,stroke:#4a148c classDef storage fill:#e8f5e8,stroke:#2e7d32 class Queue1,Queue2,Queue3,Queue4 concurrent class Agent_A,Agent_B,Agent_C,Coord hot class Work_A,Work_A2,Work_B,Work_C coordination class ETS,RegNative,Cache1,Cache2,Cache3 storage

Concurrency Insights:

  • Registry Contention: 4 simultaneous lookups hit same registry process
  • Cache Splitting: Results cached at different storage layers based on load
  • Agent Parallelism: All agents process independently until coordination needed
  • Coordination Bottleneck: MABEAM coordinator becomes single point of synchronization
  • Response Fan-out: Results propagate back through different paths than requests came in

Diagram 3: Process Failure Cascade (Fault Tolerance Flow)

sequenceDiagram participant E as External System participant R as Registry Process participant S as Supervisor Process participant A as Agent A participant B as Agent B participant C as Agent C participant M as Monitor Process Note over E,M: Normal Operation (T0-T10) E->>+R: lookup(agent_a) R->>-E: {ok, pid_a} E->>+A: work_request A->>+B: collaboration B->>+C: data_flow C->>-B: result B->>-A: processed_result A->>-E: final_response Note over E,M: Failure Event (T11) A->>X A: CRASH! (exit reason: :badmatch) M->>M: receive {'DOWN', ref, :process, pid_a, :badmatch} Note over E,M: Concurrent Failure Handling (T12-T15) par Registry Cleanup M->>R: unregister(agent_a) R->>R: :ets.delete(backup_table, agent_a) R->>R: Registry.unregister(agent_a) and Supervisor Restart S->>S: child_spec = get_child_spec(agent_a) S->>+A: spawn new agent process A->>A: init with previous state A->>-S: {ok, new_pid} and Dependent Agent Notification M->>B: {:agent_failed, agent_a, :badmatch} M->>C: {:agent_failed, agent_a, :badmatch} B->>B: pause_collaboration(agent_a) C->>C: clear_pending_requests(agent_a) end Note over E,M: Recovery Coordination (T16-T20) S->>R: register(agent_a, new_pid, metadata) R->>M: {:registered, agent_a, new_pid} M->>B: {:agent_recovered, agent_a, new_pid} M->>C: {:agent_recovered, agent_a, new_pid} par Recovery Flow B->>A: resume_collaboration C->>A: retry_pending_requests and External Request Retry E->>R: lookup(agent_a) R->>E: {ok, new_pid} E->>A: retry_work_request end A->>B: collaboration_resumed B->>C: data_flow_restored C->>A: system_healthy A->>E: recovery_complete Note over E,M: Timeline: Total recovery ~150ms

Fault Tolerance Patterns:

  • Parallel Cleanup: Registry and supervisor act concurrently during failure
  • Notification Cascade: Dependent agents notified simultaneously, not sequentially
  • State Isolation: Each agent maintains its own failure handling without blocking others
  • Recovery Coordination: Multiple systems coordinate to restore consistent state
  • External Transparency: Client sees brief unavailability but automatic recovery

Diagram 4: Resource Contention Under Load (Bottleneck Analysis)

graph TB subgraph "Load Pattern: 50 req/sec" direction TB Load[50 Requests/sec] Load -.->|10 req/sec| Q1[Queue Partition 1] Load -.->|15 req/sec| Q2[Queue Partition 2] Load -.->|25 req/sec| Q3[Queue Partition 3] end subgraph "Registry Layer: Contention Point" Q1 -.->|lookup burst| RegBot{Registry Process
⚠️ BOTTLENECK} Q2 -.->|lookup burst| RegBot Q3 -.->|lookup burst| RegBot RegBot -.->|ETS read: ~1ms| ETS[(ETS Table
Concurrent Reads)] RegBot -.->|Registry call: ~2ms| RegSys[Registry System
Sequential Access] ETS -.->|hit| FastPath[Fast Path
~1ms total] RegSys -.->|hit| SlowPath[Slow Path
~3ms total] end subgraph "Agent Processing: Parallel Execution" FastPath -.->|route| AgentPool[Agent Pool
20 Processes] SlowPath -.->|route| AgentPool AgentPool -.->|distribute| A1((A1
busy)) AgentPool -.->|distribute| A2((A2
idle)) AgentPool -.->|distribute| A3((A3
busy)) AgentPool -.->|distribute| A4((A4
idle)) AgentPool -.->|queue| A5((A5
queue:3)) AgentPool -.->|queue| A6((A6
queue:1)) end subgraph "Coordination Layer: Secondary Bottleneck" A1 -.->|coordinate| CoordQ{Coordination Queue
⚠️ SECONDARY BOTTLENECK} A3 -.->|coordinate| CoordQ A5 -.->|coordinate| CoordQ CoordQ -.->|process| CoordWorker[Coordination Worker
~5ms per coordination] CoordWorker -.->|broadcast| AgentPool end subgraph "Performance Metrics" PerfMon[Performance Monitor] PerfMon -.->|sample| RegBot PerfMon -.->|sample| AgentPool PerfMon -.->|sample| CoordQ RegBot -.->|queue_length: 12| RegMetric[Registry: 12 queued
avg_latency: 8ms
🔴 OVERLOADED] AgentPool -.->|utilization: 60%| AgentMetric[Agents: 60% busy
avg_latency: 15ms
🟡 MODERATE] CoordQ -.->|queue_length: 3| CoordMetric[Coordination: 3 queued
avg_latency: 12ms
🟢 HEALTHY] end classDef bottleneck fill:#ffebee,stroke:#c62828,stroke-width:3px classDef moderate fill:#fff8e1,stroke:#f57c00,stroke-width:2px classDef healthy fill:#e8f5e8,stroke:#2e7d32,stroke-width:1px classDef concurrent fill:#e3f2fd,stroke:#1565c0 class RegBot,RegMetric bottleneck class CoordQ,AgentMetric moderate class CoordMetric,ETS healthy class AgentPool,A1,A2,A3,A4,A5,A6 concurrent

Bottleneck Analysis:

  • Primary Bottleneck: Registry process becomes single point of contention at 50 req/sec
  • Queue Build-up: 12 requests queued at registry vs 3 at coordination (4:1 ratio)
  • Utilization Imbalance: Registry overloaded while agents only 60% utilized
  • Latency Amplification: Registry adds 8ms delay, agents add 15ms, but coordination only 12ms
  • Scaling Strategy: Registry needs partitioning or caching layer before agent pool scaling

Novel Concurrency Representation Key:

  • Dotted Arrows (-.->): Asynchronous message flow
  • Timeline Annotations: Explicit time markers (T0, T1, T2…)
  • Parallel Sections: Gantt charts and par blocks show true concurrency
  • Queue Depth Visualization: Numbers show actual queue lengths under load
  • Bottleneck Highlighting: Color coding and metrics show system stress points
  • Process State: Visual indicators (busy/idle/queue depth) show runtime behavior

This approach reveals the living system behavior rather than static code structure, showing how data flows, queues, contends, and recovers in real concurrent execution.