| From: | Don Seiler <don(at)seiler(dot)us> |
|---|---|
| To: | pgsql-performance(at)lists(dot)postgresql(dot)org |
| Subject: | High kswapd |
| Date: | 2020-04-13 14:34:23 |
| Message-ID: | CAHJZqBCWEk6-0NG9bQ8XWRaRz97ppPh=ZZZ89Ykvkn+EUHSNcg@mail.gmail.com |
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| Lists: | pgsql-performance |
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".
# free -m
total used free shared buff/cache
available
Mem: 125910 41654 820 857 83435
82231
Swap: 511 448 63
We've already got vm.swappiness and vm.zone_reclaim_mode set to 0, and NUMA
is disabled from what I can see:
# dmesg | grep -i numa
[ 0.000000] No NUMA configuration found
We are using HugePages and things look good there as well. Curious what
would be causing kswapd to run hot like it is, or if it is a red herring as
I look into high CPU usage on this box (although, again, it is the
single-highest CPU user).
--
Don Seiler
www.seiler.us
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