parser.add_argument("--job-start",type=int,help="job id to start aggregating from")
parser.add_argument("--route",action="append",help="Specify routes to download. Can be given multiple times.")
parser.add_argument("--dump-period",type=float,default=180.,help="Wait this many seconds between dumps of the URLs (default = 180., set to 0 to disable)")
parser.add_argument("--num-jobs",action="store",type=int,default=10,help="number of running jobs")