Re: Huge swap usage

From: Ricardo Martin Gomez <rimartingomez(at)hotmail(dot)com>
To: "m(dot)digirolamo(at)tecnodata-srl(dot)it" <m(dot)digirolamo(at)tecnodata-srl(dot)it>, Denis Corà <dcora(at)ibc(dot)it>
Cc: "pgsql-admin(at)lists(dot)postgresql(dot)org" <pgsql-admin(at)lists(dot)postgresql(dot)org>
Subject: Re: Huge swap usage
Date: 2018-02-28 12:15:31
Message-ID: SC1P152MB13443892C0EC956416CBB7F7A3C70@SC1P152MB1344.LAMP152.PROD.OUTLOOK.COM
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Hi Mariano.
You must reconfigure postgres.conf.
Never use the same value in swap and share buffers.
Best regards.

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________________________________
From: Denis Corà <dcora(at)ibc(dot)it>
Sent: Wednesday, February 28, 2018 5:17:05 AM
To: m(dot)digirolamo(at)tecnodata-srl(dot)it
Cc: pgsql-admin(at)lists(dot)postgresql(dot)org
Subject: Re: Huge swap usage

hi Mariano,

use smem (epel repository) to find process use swap; on dedicate server, i think you can set swappiness to 5

Denis

Il 27/02/2018 12:45, Mariano Di Girolamo ha scritto:
Hi to all,
I have a virtual server centos 7.3 with posgres 9.5.7 and I have a problem with huge swap usage.
In this moment I have 0 GB of free swap and 6,5 GB of RAM free.
My swappiness is set to 30 (as default) and the page size is 4 kB.
Is there someone that can help me to solve the problem?
Below my server configuration.

Thanks

---------------------
Centos 7.3.1611
vCPU: 4
RAM: 16 GB
SWAP: 4GB
Postgresql: 9.5.7

## custom section of postgresql.conf ##
port = 5432
max_connections = 250
shared_buffers = 4GB
maintenance_work_mem = 512MB
checkpoint_timeout = 30min
escape_string_warning = off
standard_conforming_strings = off
work_mem = 32MB
effective_cache_size = 4GB
max_wal_senders = 10
log_parser_stats = on
log_planner_stats = on
log_executor_stats = on
log_statement_stats = on
log_autovacuum_min_duration = 216000000

Mariano Di Girolamo
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