Re: Regression tests fail on OpenBSD due to low semmns value

On 2024-12-16 Mo 12:23 AM, Tom Lane wrote:
> Alexander Lakhin<exclusion@gmail.com>  writes:
>> I deployed OpenBSD 7.4 locally and reproduced "too many clients" and that
>> hang as well. It turned out that OpenBSD has semmns as low as 60 (see [4])
>> and as a consequence, initdb sets max_connections = 20 for the regression
>> test database. (This can be helpful sometimes, see e.g., [5].) At the same
>> time, paralell_schedule contains groups of 20 tests, for instance:
> Yeah.  That was more-or-less okay before we invented parallel query,
> but now there needs to be some headroom.  I've thought about adjusting
> initdb to not allow max_connections less than 25 (can't remember if
> I actually proposed that on-list though).  The other way would be to
> rearrange parallel_schedule to make the max group size less than 20,
> but that seems like a lot of effort for little benefit.


25 seems perfectly reasonable, these days. The current minimum was set 
nearly 7 years ago.



cheers

andrew

--
Andrew Dunstan
EDB:https://www.enterprisedb.com