We have a situation where the Swap has suddenly spiked up to 100%. When does such a situation occur and how do we debug this? During such scenario, the VM become unresponsive or slow.
If I check the
free -lh I see as follows:
influxdb3/8b37314c-a9ff-47a9-9ccb-86e67f1fec1e:~# free -lh
total used free shared buff/cache available
Mem: 61Gi 40Gi 425Mi 614Mi 20Gi 22Gi
Low: 61Gi 61Gi 425Mi
High: 0B 0B 0B
Swap: 9Gi 9Gi 0.0Ki
Available memory is 22 GB (which I guess is free+shared+buff). But if 22Gb is free why is 100% swap used?
Also CPU during didn’t seem high.
The VM runs 16CPU and 64GB Memory. The load went up to 10. So I assume the system isn’t overloaded either.
When does influx prefer to take swap over free memory? and how do we debug if it’s a specific query or ingestion that is causing the issue
Running of influxdb 1.8 on 22.04.1-Ubuntu