Xmrig (with idle mining) via systemd and screen

check_spare_cpu.sh

#!/bin/bash
# Check the amount of CPU being consumed by processes other than xmrig
# Takes a single (optional) argument, the name of the screen to target. Defaults to "xmrig" if unspecified
set -e

#12.5% or 2 full cores (with our 16 total)
IDLE_THRESHOLD=12.5
TARGET_SCREEN="${1:-xmrig}"

NUM_CORES=$(cat /proc/cpuinfo | grep "core id" | wc -l)
LAST_STATE=0

while true; do
        NON_XMRIG_CPU=$(ps -eo "%C|%a" --no-header | awk -F '|' 'BEGIN { total = 0 }; index($2, "xmrig") == 0 { total += $1 }; END { print total }')
        TOTAL_NON_XMRIG_CPU=$(echo "scale=2; $NON_XMRIG_CPU / $NUM_CORES" | bc)
        CURRENT_STATE=$(echo "$TOTAL_NON_XMRIG_CPU > $IDLE_THRESHOLD" | bc)
        if (( $CURRENT_STATE && !$LAST_STATE )); then
                #System is too active, pause the miner
                screen -p 0 -S $TARGET_SCREEN -X eval 'stuff "p"\\015'
                echo "Miner pause"
        elif (( !$CURRENT_STATE && $LAST_STATE )); then
                #System is idle again, resume
                screen -p 0 -S $TARGET_SCREEN -X eval 'stuff "r"\\015'
                echo "Miner resume"
        fi
        LAST_STATE=$CURRENT_STATE
        sleep 1
done

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[Unit]
Description=Idle mining for XMRig - %i
Requires=xmrig@%i

[Service]
Type=simple
WorkingDirectory=/var/xmrig
User=root
RestartSec=10
Restart=always

ExecStart=/usr/local/bin/check_spare_cpu xmrig-%i

[Install]
WantedBy=network-online.target

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[Unit]
Description=XMRig Miner - %i

[Service]
Type=simple
WorkingDirectory=/var/xmrig
User=root
RestartSec=30
Restart=on-failure

ExecStart=/usr/bin/screen -DmS xmrig-%i ./xmrig -c %i.json

[Install]
WantedBy=network-online.target