[pgpool-general: 2225] Pool queue length

James Sewell james.sewell at lisasoft.com
Wed Oct 30 09:31:01 JST 2013

Hello All,

The documentation states:

"Up to 2*num_init_children can be queued"

I assumed this to mean that if I set num_init_children to 2, then I can
field 2 client connections (one to each forked process) at a time. The
third and fourth connections will be queued, then the fifth will be

However this doesn't seem to be the reality. I can demonstrate this with
psql, opening many more than 4 connections. The first two connect, the next
x idle waiting for a connection.

I saw another similar post which said:

"... it is up to OSs behavior when pgpool set backlog parameter"

Could someone explain this a bit more? Where is the backlog parameter?

Is there a way I can check this queue length so I can alarm on it?


James Sewell,
PostgreSQL Team Lead / Solutions Architect

 Level 2, 50 Queen St, Melbourne VIC 3000

*P *(+61) 3 8370 8000 * **W* www.lisasoft.com  *F *(+61) 3 8370 8099


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