[Dovecot] What's the parameter -w for dovecot-auth: dovecot -w

[ldaamandy]

hello:
    
What's the parameter -w for dovecot-auth:   dovecot -w my service of 
dovecot-auth always activing two: one is" dovecot-auth"   , the other is" 
dovecot-auth -w" i don't know the diffevent between them                        
                                              amandy                            
                                               thanks!