如何在 Linux 3.2(Debian Wheezy)中使用 compcache

如何在 Linux 3.2(Debian Wheezy)中使用 compcache

如何为 Debian Wheezy (3.2 内核) 设置和配置 compcache。据我所知,compcache 现在位于内核中,在 debian repo 中也找不到。据我所知,Compcache 应该可以通过 /sys 或 /proc 接口访问,但我不知道它在 Debian 中的位置/名称。

答案1

经过一番搜索,我找到了一个脚本,它很好地解释了如何打开 zram 来替换 compcache。编辑:我还对脚本做了一些修改 - 这是更新后的版本。

编辑:2016. 下面我还为 zram 添加了 systemd 服务示例(与 compcache 相同)

#! /bin/sh
### BEGIN INIT INFO
# Provides:          zramstuff
# Required-Start:    $local_fs
# Required-Stop:     $local_fs
# Default-Start:     2
# Default-Stop:      0 6
# Short-Description: Enable swap to compressed ram
# Description:       Enables swapping to compressed ram
### END INIT INFO

case "$1" in
  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

       # 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
         fi
       done

       rmmod zram
       ;;
esac

Systemd 服务示例:(在 Debian 上测试)

[Unit]
Description=Set up zram
Conflicts=hibernate.service

[Service]
Environment=ZRAM_MEM=1G
Environment=ZRAM_CMPALGO=lz4
Environment=ZRAM_CMPSTREAMS=2

Type=oneshot
User=root
ExecStartPre=/bin/sh -c "/sbin/modprobe zram num_devices=1"
ExecStartPre=/bin/sh -c "echo $ZRAM_CMPALGO >/sys/block/zram0/comp_algorithm"
ExecStartPre=/bin/sh -c "echo $ZRAM_CMPSTREAMS >/sys/block/zram0/max_comp_streams"
ExecStartPre=/bin/sh -c "echo $ZRAM_MEM > /sys/block/zram0/disksize"
ExecStartPre=/bin/sh -c "/sbin/mkswap /dev/zram0"
ExecStart=/sbin/swapon /dev/zram0 -p 10

ExecStop=/sbin/swapoff /dev/zram0
ExecStop=/bin/echo 1 > /sys/block/zram0/reset
ExecStop=/sbin/rmmod zram

RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

答案2

我相信compcache将显示为名为 SWAP 类型的设备/dev/ramzswap0。您应该能够使用 看到它被列出blkid

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