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#!/bin/bash
set -o pipefail
################################################################ VM Count
vm_count_with_mem_usage=$(sudo qm list | tail -n+2 | egrep " (running|paused|inmigrate|internal-error|io-error|save-vm) " | wc -l)
################################################################ Ram Stats
ram_total=$(grep "^MemTotal: " /proc/meminfo | awk '{print $2}')
ram_available=$(grep "^MemAvailable: " /proc/meminfo | awk '{print $2}')
ram_used=$(( $ram_total - $ram_available ))
################################################################ Swap Stats
swap_used=0
while read loop_device loop_type loop_size loop_used loop_prio; do
swap_used=$(( $swap_used + $loop_used ))
done < <(tail -n+2 /proc/swaps | grep -v ^/dev/zram)
################################################################ Calc total mem usage
mem_used=$(( $ram_used + $swap_used ))
################################################################ Calc avg mem usage for VMs
avg_vm_mem_used=0
if [[ $vm_count_with_mem_usage != 0 ]]; then
avg_vm_mem_used=$(( $mem_used / $vm_count_with_mem_usage))
fi
# convert Kilobytes to Bytes
avg_vm_mem_used=$(( $avg_vm_mem_used * 1024 ))
################################################################ Output
echo $avg_vm_mem_used