ruvnet/ruflo · error

Worker spawn exceeded 50ms target: ${spawnTime.toFixed(2)}ms

Error message

Worker spawn exceeded 50ms target: ${spawnTime.toFixed(2)}ms

What it means

Performance warning in WorkerDispatch.dispatch(): spawning and queueing a worker took longer than the 50ms latency target measured via performance.now(). Functionally successful; flags regression in spawn-path performance.

Source

Thrown at v3/@claude-flow/swarm/src/workers/worker-dispatch.ts:408

    this.workers.set(workerId, worker);

    // Add to queue with priority
    const priority = this.getPriorityValue(options.priority || TRIGGER_CONFIGS[trigger].priority);
    this.queue.push({ id: workerId, priority });

    if (this.config.priorityQueue) {
      this.queue.sort((a, b) => b.priority - a.priority);
    }

    // Emit event
    this.emit('worker:queued', { workerId, trigger, context });

    // Process queue
    await this.processQueue();

    const spawnTime = performance.now() - startTime;
    if (spawnTime > 50) {
      console.warn(`Worker spawn exceeded 50ms target: ${spawnTime.toFixed(2)}ms`);
    }

    return workerId;
  }

  /**
   * Detect triggers in a prompt/context
   *
   * @param text - Text to analyze
   * @returns Detection result
   */
  detectTriggers(text: string): TriggerDetectionResult {
    const startTime = performance.now();
    const detectedTriggers: WorkerTrigger[] = [];
    let totalMatches = 0;

    for (const [trigger, patterns] of Object.entries(TRIGGER_PATTERNS) as [WorkerTrigger, RegExp[]][]) {
      for (const pattern of patterns) {

View on GitHub (pinned to fa13ee4ad6)

Solutions

1. Reduce per-spawn initialization work (lazy-load modules, reuse worker pools) to bring spawn time under the 50ms target.
2. Pre-warm worker threads/processes at startup so dispatch does not pay cold-start cost.
3. Profile the spawn path to find the slow step (module load, IPC setup, serialization) and optimize it.

When it happens

Trigger: Worker thread spawn latency exceeds the 50ms performance budget; occurs under CPU contention, cold V8 isolate startup, large bundled worker entry scripts, or when the host process is near its thread/file-descriptor limits.

Common situations: See trigger scenarios.

AI-assisted analysis of ruvnet/ruflo@fa13ee4ad6 (2026-08-18). Data as JSON: /api/errors/24046904e48081f7. Report an issue: GitHub.