| Type: | integer |
| Default: | -1 |
| Min: | -1 |
| Max: | 1024 |
| Context: | postmaster |
| Restart: | true |
| Since: | 18 |
Controls the maximum number of I/O operations that one process can execute simultaneously.
The default setting of -1 selects a number based on shared_buffers and the maximum number of processes (max_connections, guc-autovacuum-worker-slots, max_worker_processes and max_wal_senders), but not more than 64.
This parameter can only be set at server start.