tangetools/zram-init/zram

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2012-04-12 22:23:41 +00:00
#!/bin/bash
### BEGIN INIT INFO
# Provides: zram
# Required-Start:
# Required-Stop:
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Increased Performance In Linux With zRam (Virtual Swap Compressed in RAM)
# Description: Adapted from systemd scripts at https://github.com/mystilleef/FedoraZram
### END INIT INFO
# Author: tradetaxfree http://crunchbanglinux.org/forums/topic/15344/zram-a-good-idea/
start() {
# get the number of CPUs
num_cpus=$(grep -c processor /proc/cpuinfo)
# if something goes wrong, assume we have 1
[ "$num_cpus" != 0 ] || num_cpus=1
# set decremented number of CPUs
decr_num_cpus=$((num_cpus - 1))
# get the amount of memory in the machine
mem_total_kb=$(grep MemTotal /proc/meminfo | grep -E --only-matching '[[:digit:]]+')
mem_total=$((mem_total_kb * 1024))
# load dependency modules
modprobe zram zram_num_devices=$num_cpus || modprobe zram num_devices=$num_cpus || exit 1
2012-04-12 22:23:41 +00:00
# initialize the devices
for i in $(seq 0 $decr_num_cpus); do
echo $((mem_total / num_cpus)) > /sys/block/zram$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
}
stop() {
# get the number of CPUs
num_cpus=$(grep -c processor /proc/cpuinfo)
# set decremented number of CPUs
decr_num_cpus=$((num_cpus - 1))
# Switching off swap
for i in $(seq 0 $decr_num_cpus); do
if [ "$(grep /dev/zram$i /proc/swaps)" != "" ]; then
swapoff /dev/zram$i
sleep 0.1
fi
done
sleep 0.1
modprobe -r zram
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
sleep 3
start
;;
*)
echo "Usage: $0 {start|stop|restart}"
RETVAL=1
esac
exit $RETVAL