persister/whisper.go
func (p *Whisper) SetWorkers(count int) {
	if count >= 1 {
		p.workersCount = count
	} else {
		p.workersCount = 1
	}
}
func (p *Whisper) SetWorkers(count int) {
	if count >= 1 {
		p.workersCount = count
	} else {
		p.workersCount = 1
	}
}
// SetWorkers count