Workers number question

[eawer]

Hello! I'm starting summ-eval-start like this:
summ-eval-start -data_dir /data -num_worker=16
Then I see this output:

                 ARG   VALUE
__________________________________________________
                cors = *
            data_dir = /data
                fp16 = False
    http_max_connect = 10
           http_port = None
          num_worker = 16
                port = 5555
            port_out = 5556
             verbose = False
                 xla = False

I:VENTILATOR:[__i:_ru: 91]:bind all sockets
I:VENTILATOR:[__i:_ru: 95]:open 32 ventilator-worker sockets
I:VENTILATOR:[__i:_ru: 98]:start the sink
I:SINK:[__i:_ru:203]:ready
I:WORKER-1:[__i:sco:363]:ready and listening!
I:VENTILATOR:[__i:_ru:130]:new config request	req id: 1	client: b'f7284b23-226a-4c78-b70d-a9dc0a39129e'
I:SINK:[__i:_ru:251]:send config	client b'f7284b23-226a-4c78-b70d-a9dc0a39129e'
...

Despite setting -num_worker=16 in the log I see only mentions of WORKER-1. Is it ok, and all 16 workers are there, or am I missing 15 workers?