Re: BUG #18343: Incorrect description in postgresql.conf for max_parallel_workers_per_gather

PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
> In the default postgresql.conf that is generated, there are the following
> lines:

> #max_worker_processes = 8 # (change requires restart)
> #max_parallel_workers_per_gather = 2 # taken from max_parallel_workers
> <<<<<<<<<<<<<<<<<<<<<<<< THIS
> #max_parallel_maintenance_workers = 2 # taken from max_parallel_workers
> max_parallel_workers = 8 # maximum number of max_worker_processes that
> # can be used in parallel operations

> it indicates that the default value is taken from whatever
> max_parallel_workers is.

No, you're misreading it. There's no magic connection between these
two settings. What the comment means to say is that the per-gather
worker processes come out of a pool of at most max_parallel_workers
processes. Perhaps another wording would be better, but we don't have
a lot of space here --- any thoughts?

regards, tom lane