System level testing

1. Confirm Swap is enabled but idle

free -h
swapon --show
cat /proc/swaps

2. Configure the kernel to prefer swap more

# Save current value so you can put it back later
cat /proc/sys/vm/swappiness

# Temporarily crank it up
sudo sysctl vm.swappiness=100

Restore later with:

sudo sysctl vm.swappiness=<original_value>

Stress-ng testing

# Allocate a lot of anonymous memory for a short time
sudo stress-ng --vm 1 --vm-bytes 95% --timeout 60s