Hello, I recently setup zram (for compressed swap space in RAM) on an older low RAM machine. I was quite happy with the result and started now to do the same setup also on my other machines. I am wondering if anybody is investigating, if debian should do that by default when installing a new machine or even better also when machines get upgraded.
Here is what I did: (see http://crunchbanglinux.org/forums/post/150355/#p150355 for more details) /etc/modules: add zram add (num_devices=<number cpu cores>) rd@blackbox:~$ cat /etc/modprobe.d/zram.conf options zram num_devices=2 rd@blackbox:~$ /etc/init.d/zram #!/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 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=$((mem_total_kb * 1024)) # load dependency modules modprobe zram num_devices=$num_cpus # 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 1 fi done sleep 1 rmmod zram } case "$1" in start) start ;; stop) stop ;; restart) stop sleep 3 start ;; *) echo "Usage: $0 {start|stop|restart}" RETVAL=1 esac exit $RETVAL ################END############## # update-rc.d zram defaults Thanks, Rainer -- Rainer Dorsch http://bokomoko.de/ -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/201201071848.38748...@bokomoko.de
