Useful links:
Server configuration https://www.pgpool.net/docs/42/en/html/runtime-config-connection.html#GUC-NUM-INIT-CHILDREN
Parameters relations https://pgpool.net/mediawiki/index.php/Relationship_between_max_pool,_num_init_children,_and_max_connections
| PGPOOL_CHILD_MAX_CONNECTIONS=1 --env PGPOOL_MAX_POOL=1 | PGPOOL_CHILD_MAX_CONNECTIONS=20 --env PGPOOL_MAX_POOL=20 | PGPOOL_CHILD_MAX_CONNECTIONS=1 --env PGPOOL_MAX_POOL=20 | PGPOOL_CHILD_MAX_CONNECTIONS=5 --env PGPOOL_MAX_POOL=5 | PGPOOL_CHILD_MAX_CONNECTIONS=20 --env PGPOOL_MAX_POOL=1 | |
| Check-in | 4.489 | 3.379 | 4.648 | 3.484 | |
| Check-out | 9.681 | 8.485 | 10.527 | 9.564 | |
| Check-in | 4.972 | 4.514 | 5.299 | 5.023 | |
| Check-out | 9.691 | 10.245 | 10.588 | 10.784 | |
we saw here 40 connections max |