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https://b-peng.blogspot.com/2020/07/connection-pooling-in-pgpool.html
https://scalegrid.io/blog/postgresql-connection-pooling-part-4-pgbouncer-vs-pgpool/
| 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 | 4.702 |
| Check-out | 9.681 | 8.485 | 10.527 | 9.564 | 10.421 |
| Check-in | 4.972 | 4.514 | 5.299 | 5.023 | 5.65 |
| Check-out | 9.691 | 10.245 | 10.588 | 10.784 | 10.373 |
we saw here 40 connections max |
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