Re: High kswapd

On Mon, Apr 13, 2020 at 09:34:23AM -0500, Don Seiler wrote:
> Good morning,
> 
> Ubuntu 16.04.6 LTS
> PostgreSQL 9.6.5
> 
> On one of our database servers, we're regularly seeing kswapd at the top of
> "top" output, regularly using over 50 %CPU. We should have well over 80GB
> of available memory according to "free -m".

Do you have THP enabled?  Or KSM ?

tail /sys/kernel/mm/ksm/run /sys/kernel/mm/transparent_hugepage/khugepaged/defrag
/sys/kernel/mm/transparent_hugepage/enabled/sys/kernel/mm/transparent_hugepage/defrag
 

https://www.postgresql.org/message-id/20170718180152.GE17566%40telsasoft.com

-- 
Justin