max_worker_processes is a GUC to set the maximum number of background worker processes.
max_worker_processes was added in PostgreSQL 9.4 (commit 6bc8ef0b).
Default
The default value for max_worker_processes is 8.
Usage
On a standby server, max_worker_processes must be set to the same or a higher value as on the primary server.
The current value of max_worker_processes is one of the GUC configuration parameters recorded in pg_control.
References
- PostgreSQL documentation: max_worker_processes