| From: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
|---|---|
| To: | bruno da silva <brunogiovs(at)gmail(dot)com> |
| Cc: | pgsql-performance(at)lists(dot)postgresql(dot)org |
| Subject: | Re: PostgresSQL 9.5.21 very slow to connect and perform basic queries |
| Date: | 2022-07-21 20:21:46 |
| Message-ID: | 20220721202146.GR12702@telsasoft.com |
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| Thread: | |
| Lists: | pgsql-performance |
On Thu, Jul 21, 2022 at 03:59:30PM -0400, bruno da silva wrote:
> OS/version: CentOS release 6.9 (Final)
How are these set ?
tail /sys/kernel/mm/ksm/run /sys/kernel/mm/transparent_hugepage/{defrag,enabled,khugepaged/defrag} /proc/sys/vm/zone_reclaim_mode
I suspect you may be suffering from issues with transparent huge pages.
I suggest to disable KSM and THP, or upgrade to a newer OS.
I've written before about these:
https://www.postgresql.org/message-id/20170524155855.GH31097@telsasoft.com
https://www.postgresql.org/message-id/20190625162338.GF18602@telsasoft.com
https://www.postgresql.org/message-id/20170718180152.GE17566@telsasoft.com
https://www.postgresql.org/message-id/20191004060300.GA11241@telsasoft.com
https://www.postgresql.org/message-id/20200413144254.GS2228@telsasoft.com
https://www.postgresql.org/message-id/20220329182453.GA28503@telsasoft.com
On Thu, Jul 21, 2022 at 04:01:10PM -0400, bruno da silva wrote:
> The issue started a month ago.
Ok .. but how long has the DB been running under this environment ?
--
Justin
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