Linux Swap Space

Swap space

The operating system can temporarily swap out some of the memory data to the disk's swap space to free up more memory space, or swap the data into memory from an exchange space.

Linux supports two types of swap space

1. Swap partitions

2. Swap space

The Linux system can have up to 32 swap spaces, with a maximum of 2GB per swap space on a 386-compatible platform.

Recommendations for allocating swap space: 4MB or 8MB, typically 1 to twice times of physical memory

Creation of swap partitions

(1) Preparation: Create a partition/DEV/SDB1 and set its type to the "(Linux Swap)"

(2) format swap partition

Mkswap/dev/sdb1

(3) Enable swap partition

Swapon/dev/sdb1

view swap partition, swap file status : Swapon-s or with free

Deactivate swap partition: SWAPOFF/DEV/SDB1

Creation of swap files

(1) Create a new empty file

DD If=/dev/zero of=/tmp/swapfile bs=1m count=200

(2) format the file as a swap file

Mkswap/tmp/swapfile

(3) Enable swap file

Swapon/tmp/swapfile

(4) If you want to activate this swap file automatically when the system starts, add the following line to the/etc/fstab

/tmp/swapfile Swap swap defaults 0 0

Deactivate swap file: Swapoff/tmp/swapfile

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Linux Swap Space