/etc/rc.local
#!/bin/bash
/usr/bin/zram.sh
exit 0

/usr/bin/zram.sh
#!/bin/bash
cores=$(nproc --all)
modprobe zram num_devices=$cores

swapoff -a

totalmem=`free | grep -e "^Mem:" | awk '{print $4}'`
mem=$(( ($totalmem / $cores)* 1024 ))

core=0
while [ $core -lt $cores ]; do
  echo $mem > /sys/block/zram$core/disksize
  mkswap /dev/zram$core
  swapon -p 5 /dev/zram$core
  let core=core+1
done