1997
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1984
Some updates
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'''zram''' (previously called '''compcache''') can create RAM based block devices. It is an experimental (staging) module of the Linux kernel since 3.2. | '''zram''' (previously called '''compcache''') can create RAM based block devices. It is a module of the Linux kernel since 3.2. |
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== Background information == | See https://code.google.com/p/compcache/ and WikiPedia:Zram for more info. |
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* https://code.google.com/p/compcache/ * WikiPedia:Zram |
== Installation and use == |
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== Startup script == | Starting at buster (current testing) it's possible to simply install the '''zram-tools''' package and customize '''/etc/default/zramswap''' for your needs. |
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Copy the following script to ''/etc/init.d/zram'': | For systems using a standard SysV-based init system, it's possible to copy the following script to ''/etc/init.d/zram'': |
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CPUS=`grep -c processor /proc/cpuinfo` | CPUS=`nproc` |
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then you may have to make the script executable: | then make the script executable: |
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== NB! == For the version with the systemd should be used package [[http://packages.ubuntu.com/tr/vivid/zram-config|Ubuntu zram-config_0.3_all.deb]] and newer. |
zram (previously called compcache) can create RAM based block devices. It is a module of the Linux kernel since 3.2.
See https://code.google.com/p/compcache/ and Zram for more info.
Installation and use
Starting at buster (current testing) it's possible to simply install the zram-tools package and customize /etc/default/zramswap for your needs.
For systems using a standard SysV-based init system, it's possible to copy the following script to /etc/init.d/zram:
#!/bin/sh ### BEGIN INIT INFO # Provides: zram # Required-Start: $local_fs # Required-Stop: $local_fs # Default-Start: S # Default-Stop: 0 1 6 # Short-Description: Use compressed RAM as in-memory swap # Description: Use compressed RAM as in-memory swap ### END INIT INFO # Author: Antonio Galea <antonio.galea@gmail.com> # Thanks to Przemysław Tomczyk for suggesting swapoff parallelization # Distributed under the GPL version 3 or above, see terms at # https://gnu.org/licenses/gpl-3.0.txt FRACTION=75 MEMORY=`perl -ne'/^MemTotal:\s+(\d+)/ && print $1*1024;' < /proc/meminfo` CPUS=`nproc` SIZE=$(( MEMORY * FRACTION / 100 / CPUS )) case "$1" in "start") param=`modinfo zram|grep num_devices|cut -f2 -d:|tr -d ' '` modprobe zram $param=$CPUS for n in `seq $CPUS`; do i=$((n - 1)) echo $SIZE > /sys/block/zram$i/disksize mkswap /dev/zram$i swapon /dev/zram$i -p 10 done ;; "stop") for n in `seq $CPUS`; do i=$((n - 1)) swapoff /dev/zram$i && echo "disabled disk $n of $CPUS" & done wait sleep .5 modprobe -r zram ;; *) echo "Usage: `basename $0` (start | stop)" exit 1 ;; esac
then make the script executable:
chmod +x /etc/init.d/zram
then instruct your system to start it at boot time, with the command
insserv zram