add zram config

add-qtum/03-setup-zram/00-run.sh

@@ -0,0 +1,7 @@
+#!/bin/bash -e
+
+install -m 755 files/zram "${ROOTFS_DIR}/etc/init.d/"
+
+on_chroot << EOF
+systemctl enable zram
+EOF

add-qtum/03-setup-zram/files/zram

@@ -0,0 +1,26 @@
+#!/bin/bash
+### BEGIN INIT INFO
+# Provides:          zram
+# Required-Start:
+# Required-Stop:
+# Default-Start: 3
+# Default-Stop:
+# Short-Description: Boost memory performance
+# Description:
+### END INIT INFO
+cores=$(nproc --all)
+modprobe zram num_devices=$cores
+
+swapoff -a
+
+totalmem=`free | grep -e "^Mem:" | awk '{print $2}'`
+mem=$(( ($totalmem / $cores)* 1024 ))
+
+core=0
+while [ $core -lt $cores ]; do
+  echo $mem > /sys/block/zram$core/disksize
+  echo lz4 > /sys/block/zram$core/comp_algorithm
+  mkswap /dev/zram$core
+  swapon -p 5 /dev/zram$core
+  let core=core+1
+done