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
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
# 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
www.seiler.us
