var workers, mrfWorkers int
	p.mu.Lock()
	switch pri {
	case "fast":
		workers = WorkerMaxLimit
		mrfWorkers = MRFWorkerMaxLimit
	case "slow":
		workers = WorkerMinLimit
		mrfWorkers = MRFWorkerMinLimit
	default:
		workers = WorkerAutoDefault
		mrfWorkers = MRFWorkerAutoDefault
		if len(p.workers) < WorkerAutoDefault {