BUG #17309: Memory consumption

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BUG #17309: Memory consumption

От:
PG Bug reporting form <noreply@postgresql.org>
Дата:
The following bug has been logged on the website:

Bug reference:      17309
Logged by:          raj adi
Email address:      vihari.postgresdba@gmail.com
PostgreSQL version: 13.2
Operating system:   linux
Description:        

Hi Team,

We are configured postgres 13.2 version in the EKS cluster. We are facing
high memory consumption. we have 60GB of  RAM and with in one week almost
the memory is reaching 40 GB. I found one of the checkpointer background
process is consuming 16.1 % memory. I never seen this much memory
consumption in the postgres. Please provide any option to resolve this
memory issue. Kindly let me know if any memory leak in the postgres 13.2
version.

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
1001       101  0.0 16.1 10858488 10534144 ?   Ss   Nov14  17:18 postgres:
checkpointer

Thanks and Regards,
Vihari

Re: BUG #17309: Memory consumption

От:
Tom Lane <tgl@sss.pgh.pa.us>
Дата:
PG Bug reporting form  writes:
> We are configured postgres 13.2 version in the EKS cluster. We are facing
> high memory consumption. we have 60GB of  RAM and with in one week almost
> the memory is reaching 40 GB. I found one of the checkpointer background
> process is consuming 16.1 % memory. I never seen this much memory
> consumption in the postgres. Please provide any option to resolve this
> memory issue. Kindly let me know if any memory leak in the postgres 13.2
> version.

It seems quite unlikely that there's any actual bug here; more likely,
you are misreading the output of "ps".  Many versions of ps will report
a process's use of shared memory as though it were local memory in that
process, ie ps will claim that each process is consuming the whole amount
of the shared memory, even though there's really only one copy.

Particularly with the checkpointer, which doesn't run any user-defined
code, a leak isn't very credible.  I would ask first what is your
shared_buffers setting?  If the checkpointer's reported memory
consumption isn't much more than that, then there's nothing to see here.

			regards, tom lane
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