Patrick Williams | b48b7b4 | 2016-08-17 15:04:38 -0500 | [diff] [blame^] | 1 | #!/bin/sh |
| 2 | ### BEGIN INIT INFO |
| 3 | # Provides: zram |
| 4 | # Required-Start: |
| 5 | # Required-Stop: |
| 6 | # Default-Start: 2 3 4 5 |
| 7 | # Default-Stop: 0 1 6 |
| 8 | # Short-Description: Increased Performance In Linux With zRam (Virtual Swap Compressed in RAM) |
| 9 | # Description: Adapted from systemd scripts at https://github.com/mystilleef/FedoraZram |
| 10 | # Included as part of antix-goodies package by anticapitalista <antiX@operamail.com> |
| 11 | # This script was written by tradetaxfree and is found at http://crunchbanglinux.org/forums/topic/15344/zram-a-good-idea/ |
| 12 | # Copy this script (as root) from /usr/local/bin to /etc/init.d and then #update-rc.d zram defaults |
| 13 | # After booting verify the module is loaded with: lsmod | grep zram |
| 14 | ### END INIT INFO |
| 15 | set -e |
| 16 | |
| 17 | start() { |
| 18 | # get the number of CPUs |
| 19 | num_cpus=$(grep -c processor /proc/cpuinfo) |
| 20 | # if something goes wrong, assume we have 1 |
| 21 | [ "$num_cpus" != 0 ] || num_cpus=1 |
| 22 | |
| 23 | # set decremented number of CPUs |
| 24 | last_cpu=$((num_cpus - 1)) |
| 25 | |
| 26 | #default Factor % = 90 change this value here or create /etc/default/zram |
| 27 | FACTOR=90 |
| 28 | #& put the above single line in /etc/default/zram with the value you want |
| 29 | [ -f /etc/default/zram ] && . /etc/default/zram || true |
| 30 | factor=$FACTOR # percentage |
| 31 | |
| 32 | # get the amount of memory in the machine |
| 33 | memtotal=$(grep MemTotal /proc/meminfo | awk ' { print $2 } ') |
| 34 | mem_by_cpu=$(($memtotal/$num_cpus*$factor/100*1024)) |
| 35 | |
| 36 | # load dependency modules |
| 37 | modprobe zram zram_num_devices=$num_cpus |
| 38 | echo "zram devices probed successfully" |
| 39 | |
| 40 | # initialize the devices |
| 41 | for i in $(seq 0 $last_cpu); do |
| 42 | echo 1 > /sys/block/zram$i/reset |
| 43 | echo $mem_by_cpu > /sys/block/zram$i/disksize |
| 44 | # Creating swap filesystems |
| 45 | mkswap /dev/zram$i |
| 46 | # Switch the swaps on |
| 47 | swapon -p 100 /dev/zram$i |
| 48 | done |
| 49 | } |
| 50 | |
| 51 | stop() { |
| 52 | # get the number of CPUs |
| 53 | num_cpus=$(grep -c processor /proc/cpuinfo) |
| 54 | |
| 55 | # set decremented number of CPUs |
| 56 | last_cpu=$((num_cpus - 1)) |
| 57 | |
| 58 | # Switching off swap |
| 59 | for i in $(seq 0 $last_cpu); do |
| 60 | if [ "$(grep /dev/zram$i /proc/swaps)" != "" ]; then |
| 61 | swapoff /dev/zram$i |
| 62 | sleep 1 |
| 63 | fi |
| 64 | done |
| 65 | sleep 1 |
| 66 | rmmod zram |
| 67 | } |
| 68 | |
| 69 | case "$1" in |
| 70 | start) |
| 71 | start |
| 72 | ;; |
| 73 | stop) |
| 74 | stop |
| 75 | ;; |
| 76 | restart) |
| 77 | stop |
| 78 | sleep 3 |
| 79 | start |
| 80 | ;; |
| 81 | *) |
| 82 | echo "Usage: $0 {start|stop|restart}" |
| 83 | RETVAL=1 |
| 84 | esac |
| 85 | exit $RETVAL |