Re: checkpoint process use too much memory

Thanks Tom and Alvaro. I will upgrade it to 10.13 first.
James

________________________________
From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Sent: Monday, July 20, 2020 18:34
To: jian xu <jamesxu(at)outlook(dot)com>
Cc: MichaelDBA <MichaelDBA(at)sqlexec(dot)com>; Scott Ribe <scott_ribe(at)elevated-dev(dot)com>; Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>; pgsql-admin(at)postgresql(dot)org <pgsql-admin(at)postgresql(dot)org>
Subject: Re: checkpoint process use too much memory

jian xu <jamesxu(at)outlook(dot)com> writes:
> we are seeing this issue again, the checkpoint process is eating up all the memory,
> based on the htop, the checkpointer process has
> VIRT: 103G
> RES: 103G
> SHR: 4099M

hmmm ...

> my pg version is 10.3 ,

Really the *first* thing you ought to do is update to current (10.13)
and see if the problem is still there. But if it is, maybe collecting
a memory context map in that process would be informative:

https://wiki.postgresql.org/wiki/Developer_FAQ#Examining_backend_memory_use

Note you may need a debug build for that recipe to work.

regards, tom lane