How to manual select concurrent writers number using influx-stress tool

Hi all,

I am using influx-stress tool (GitHub - influxdata/influx-stress: New tool for generating artificial load on InfluxDB) in order to stress out my influx instance.
The above mentioned tool works nicely, and as expected. My only doubt regards the number of used threads, that really seems to rely on selected batch size.

When batch size increases, thread number decreases, and viceversa. In this way, I have same results (in terms of PPS) for almost any batch size.

It actually seems that there is no thread parameter in the help section: how can i manually select and fix the number of used threads??

Thanks, Luca.