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From: Tom Lane <tgl@sss.pgh.pa.us>
To: jian xu <jamesxu@outlook.com>
Cc: MichaelDBA <MichaelDBA@sqlexec.com>
Cc: Scott Ribe <scott_ribe@elevated-dev.com>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: pgsql-admin@postgresql.org <pgsql-admin@postgresql.org>
Subject: Re: checkpoint process use too much memory
Date: Mon, 20 Jul 2020 18:34:25 -0400
Message-ID: <736811.1595284465@sss.pgh.pa.us> (raw)
In-Reply-To: <DM6PR05MB68270B6144BDF688D3849436A17B0@DM6PR05MB6827.namprd05.prod.outlook.com>
References: <MN2PR05MB68322593E34D4BF78AD45137A1D70@MN2PR05MB6832.namprd05.prod.outlook.com>
	<5193b00d175f2e06a171ba375f1ef723e1700de4.camel@cybertec.at>
	<MN2PR05MB6832AA29B8D72FCA59D29E19A1D40@MN2PR05MB6832.namprd05.prod.outlook.com>
	<C7D8AF88-5A80-4F1E-B3AF-7BB01369FD87@elevated-dev.com>
	<MN2PR05MB6832881823D2B12D767C8C67A1D40@MN2PR05MB6832.namprd05.prod.outlook.com>
	<B2103F5D-29DD-465C-A43B-9973EC313799@elevated-dev.com>
	<fcb5bde4-437d-913e-cb1f-3fdb866a805a@sqlexec.com>
	<MN2PR05MB68327F7153695ED742BF1B19A1D50@MN2PR05MB6832.namprd05.prod.outlook.com>
	<DM6PR05MB68270B6144BDF688D3849436A17B0@DM6PR05MB6827.namprd05.prod.outlook.com>

jian xu <jamesxu@outlook.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

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