zipram.bash

#!/bin/bash

. /etc/rc.conf
. /etc/rc.d/functions

# get the number of CPUs
num_cpus=`grep -c processor /proc/cpuinfo`
# set decremented number of CPUs
decr_num_cpus=`expr $num_cpus - 1`

case "$1" in
	start)
		stat_busy "Enabling zRam"
		# get the amount of memory in the machine
		mem_total_kb=`grep MemTotal /proc/meminfo | grep -E --only-matching '[[:digit:]]+'`
		mem_total=`expr $mem_total_kb \* 1024`

		# load dependency modules
		modprobe zram num_devices=$num_cpus

		# initialize the devices
		for i in `seq 0 $decr_num_cpus`; do
		echo `expr $mem_total / $num_cpus` > /sys/block/zram$i/disksize
		done

		# Creating swap filesystems
		for i in `seq 0 $decr_num_cpus`; do
		mkswap /dev/zram$i
		done

		# Switch the swaps on
		for i in `seq 0 $decr_num_cpus`; do
		swapon -p 100 /dev/zram$i
		done

		stat_done
	;;
	stop)
		stat_busy "Switching off zRam"
		# Switching off swap
		for i in `seq 0 $decr_num_cpus`; do
		if [ "`grep /dev/zram$i /proc/swaps`" != "" ]; then
		swapoff /dev/zram$i
		fi
		done

		rmmod zram
		stat_done
	;;
	*)
		echo "usage: $0 {start|stop}"
esac

exit 0