On 1/5/17 12:01 PM, Andres Freund wrote: > On 2017-01-05 08:38:32 -0500, Peter Eisentraut wrote: >> I also suggest making the defaults for both 20 instead of 10. That >> leaves enough room that almost nobody ever has to change them, whereas >> 10 can be a bit tight for some not-outrageous installations (8 standbys >> plus backup?). > > I'm afraid we need to add initdb integration / testing for those. I mean > we have initdb test down to 10 connections to deal with limited > resources...
Those initdb defaults were last touched in 2005, before the use of System V shared memory was reduced to a minimum. It might be worth revisiting that. The only way to end up with a low number of connection slots would seem to be a very low semaphore configuration.
In the build farm, I have found 6 critters that do not end up with the 100/128MB setting: sidewinder, curculio, coypu, brolga, lorikeet, opossum. I wonder what limitations initdb is bumping against.
Since you lookeda t the data -- they did not end up with 100, but what's the lowest they did end up with? Did they go all the way down to 10?
