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关闭交换区

相关命令

  • 查看交换区信息
swapon --show

NAME      TYPE SIZE USED PRIO
/swapfile file   2G   0B   -2
  • 启用 /etc/fstab 中的所有交换区
swapon -a
  • 禁用 /proc/swaps 中的所有交换区（重启系统后失效）
swapoff -a
  • 查看内存信息
free -h

              总计         已用        空闲      共享    缓冲/缓存    可用
内存：        7.7G        338M        6.9G         66M        498M        7.1G
交换：        1.9G          0B        1.9G

小主机 x86(Ubuntu 18.04.4)

  • 查看交换区信息
swapon --show

NAME      TYPE SIZE USED PRIO
/swapfile file   2G   0B   -2
  • 查看内存信息
free -h

              总计         已用        空闲      共享    缓冲/缓存    可用
内存：        7.7G        338M        6.9G         66M        498M        7.1G
交换：        1.9G          0B        1.9G
  • 注释 /etc/fstab 文件中的 /swapfile 一行
sudo nano /etc/fstab

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda2 during installation
UUID=6f99d2a2-5d88-4627-bff2-f1d1dec38603 /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/sda1 during installation
UUID=9C28-932D  /boot/efi       vfat    umask=0077      0       1
#/swapfile                                 none            swap    sw              0       0
  • 重启
sudo reboot

Jetson Nano(Jetson Nano Developer Kit Ubuntu 18.04.4)

  • 查看交换区信息
swapon --show

NAME       TYPE        SIZE USED PRIO
/dev/zram0 partition 495.5M   0B    5
/dev/zram1 partition 495.5M   0B    5
/dev/zram2 partition 495.5M   0B    5
/dev/zram3 partition 495.5M   0B    5
  • 查看内存信息
free -h

              total        used        free      shared  buff/cache   available
Mem:           3.9G        505M        2.8G         27M        636M        3.2G
Swap:          1.9G          0B        1.9G
  • 禁用 nvzramconfig 服务
sudo systemctl disable nvzramconfig
Removed /etc/systemd/system/multi-user.target.wants/nvzramconfig.service.
  • 重启
sudo reboot

Raspberry PI4(Raspbian Buster Lite)

  • 查看交换区信息
swapon --show

NAME      TYPE SIZE USED PRIO
/var/swap file 100M   0B   -2
  • 查看内存信息
free -h

              total        used        free      shared  buff/cache   available
Mem:          3.8Gi       185Mi       3.0Gi        73Mi       608Mi       3.5Gi
Swap:          99Mi          0B        99Mi
  • 修改 /etc/dphys-swapfile 文件 CONF_SWAPSIZE=0
sudo nano /etc/dphys-swapfile

# /etc/dphys-swapfile - user settings for dphys-swapfile package
# author Neil Franklin, last modification 2010.05.05
# copyright ETH Zuerich Physics Departement
#   use under either modified/non-advertising BSD or GPL license

# this file is sourced with . so full normal sh syntax applies

# the default settings are added as commented out CONF_*=* lines


# where we want the swapfile to be, this is the default
#CONF_SWAPFILE=/var/swap

# set size to absolute value, leaving empty (default) then uses computed value
#   you most likely don't want this, unless you have an special disk situation
CONF_SWAPSIZE=0

# set size to computed value, this times RAM size, dynamically adapts,
#   guarantees that there is enough swap without wasting disk space on excess
#CONF_SWAPFACTOR=2

# restrict size (computed and absolute!) to maximally this limit
#   can be set to empty for no limit, but beware of filled partitions!
#   this is/was a (outdated?) 32bit kernel limit (in MBytes), do not overrun it
#   but is also sensible on 64bit to prevent filling /var or even / partition
#CONF_MAXSWAP=2048
  • 重启
sudo reboot

参考资料