欢快的兔子: novembre 2016

交换文件

As an alternative to creating an entire partition, a swap file offers the ability to vary its size on-the-fly, and is more easily removed altogether. This may be especially desirable if disk space is at a premium (e.g. a modestly-sized SSD).

注意: BTRFS 文件系统暂时不支持交换文件。

建立交换文件

As root use fallocate to create a swap file the size of your choosing (M = Megabytes, G = Gigabytes) (dd can also be used but will take longer). For example, creating a 512 MB swap file:

# fallocate -l 512M /swapfile
或
# dd if=/dev/zero of=/swapfile bs=1M count=512

Set the right permissions (a world-readable swap file is a huge local vulnerability)

# chmod 600 /swapfile

After creating the correctly-sized file, format it to swap:

# mkswap /swapfile

Activate the swapfile:

# swapon /swapfile

Edit /etc/fstab and add an entry for the swap file:

/swapfile none swap defaults 0 0

删除交换文件

To remove a swap file, the current swap file must be turned off.

As root:

# swapoff -a

Remove swapfile:

# rm -rf /swapfile

Checks current swap space by running free command (It must be around 10GB.).

Checks the swap partition
sudo fdisk -l /dev/hda8 none swap sw 0 0 Make swap space and enable it.
sudo swapoff -a
sudo /sbin/mkswap /dev/hda8 sudo swapon -a

If your swap disk size is not enough you would like to create swap file and use it. Create swap file.
sudo fallocate -l 10g /mnt/10GB.swap
sudo chmod 600 /mnt/10GB.swap

Mount swap file. sudo mkswap /mnt/10GB.swap
Enable swap file. sudo swapon /mnt/10GB.swap

c++11 python 对比

3d 重构suan

ubuntu 增加删除虚拟内存

交换文件

建立交换文件

删除交换文件