On Fri, 14 Apr 2023 at 12:59, Konstantin Knizhnik <knizh...@garret.ru> wrote: > > Hi hackers, > > Too small value of work_mem cause memory overflow in parallel hash join > because of too much number batches. > There is the plan:
[...] > There is still some gap between size reported by memory context sump and > actual size of backend. > But is seems to be obvious, that trying to fit in work_mem > sharedtuplestore creates so much batches, that them consume much more > memory than work_mem. The same issue [0] was reported a few weeks ago, with the same diagnosis here [1]. I think it's being worked on over there. Kind regards, Matthias van de Meent [0] https://www.postgresql.org/message-id/flat/20230228190643.1e368315%40karst [1] https://www.postgresql.org/message-id/flat/3013398b-316c-638f-2a73-3783e8e2ef02%40enterprisedb.com#ceb9e14383122ade8b949b7479c6f7e2
