Are concurrently running methods the same as workers?

As the default max_workers is 10,Does this mean that a service class method can execute up to 10 methods at once?

Since in my case, I used “nameko run” to up a service class and what I observed that only one method was in use at a time, after I called many rpc at the same time. It seems to work like a normal queue. My attempt to update the max_workers parameter appears to have had no effect.

Thank !