#!/bin/sh
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### BEGIN INIT INFO
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# Provides: zram
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# Required-Start:
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# Required-Stop:
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: Increased Performance In Linux With zRam (Virtual Swap Compressed in RAM)
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# Description: Adapted from systemd scripts at https://github.com/mystilleef/FedoraZram
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# Included as part of antix-goodies package by anticapitalista <antiX@operamail.com>
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# This script was written by tradetaxfree and is found at http://crunchbanglinux.org/forums/topic/15344/zram-a-good-idea/
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# Copy this script (as root) from /usr/local/bin to /etc/init.d and then #update-rc.d zram defaults
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# After booting verify the module is loaded with: lsmod | grep zram
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### END INIT INFO
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set -e
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start() {
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# get the number of CPUs
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num_cpus=$(grep -c processor /proc/cpuinfo)
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# if something goes wrong, assume we have 1
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[ "$num_cpus" != 0 ] || num_cpus=1
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# set decremented number of CPUs
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last_cpu=$((num_cpus - 1))
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#default Factor % = 90 change this value here or create /etc/default/zram
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FACTOR=90
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#& put the above single line in /etc/default/zram with the value you want
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[ -f /etc/default/zram ] && . /etc/default/zram || true
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factor=$FACTOR # percentage
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# get the amount of memory in the machine
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memtotal=$(grep MemTotal /proc/meminfo | awk ' { print $2 } ')
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mem_by_cpu=$(($memtotal/$num_cpus*$factor/100*1024))
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# load dependency modules
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modprobe zram num_devices=$num_cpus
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echo "zram devices probed successfully"
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# initialize the devices
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for i in $(seq 0 $last_cpu); do
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echo 1 > /sys/block/zram$i/reset
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echo $mem_by_cpu > /sys/block/zram$i/disksize
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# Creating swap filesystems
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mkswap /dev/zram$i
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# Switch the swaps on
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swapon -p 100 /dev/zram$i
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done
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}
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stop() {
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# get the number of CPUs
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num_cpus=$(grep -c processor /proc/cpuinfo)
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# set decremented number of CPUs
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last_cpu=$((num_cpus - 1))
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# Switching off swap
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for i in $(seq 0 $last_cpu); do
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if [ "$(grep /dev/zram$i /proc/swaps)" != "" ]; then
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swapoff /dev/zram$i
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sleep 1
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fi
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done
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sleep 1
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rmmod zram
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}
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case "$1" in
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start)
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start
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;;
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stop)
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stop
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;;
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restart)
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stop
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sleep 3
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start
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;;
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*)
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echo "Usage: $0 {start|stop|restart}"
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RETVAL=1
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esac
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exit $RETVAL
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