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vm-monitor
The vm-monitor (or just monitor) is a core component of the autoscaling system,
along with the autoscale-scheduler and the autoscaler-agents. The monitor has
two primary roles: 1) notifying agents when immediate upscaling is necessary due
to memory conditions and 2) managing Postgres' file cache and a cgroup to carry
out upscaling and downscaling decisions.
More on scaling
We scale CPU and memory using NeonVM, our in-house QEMU tool for use with Kubernetes.
To control thresholds for receiving memory usage notifications, we start Postgres
in the neon-postgres cgroup and set its memory.{max,high}.
- See also:
neondatabase/autoscaling - See also:
neondatabase/vm-monitor, where initial development of the monitor happened. The repository is no longer maintained but the commit history may be useful for debugging.