Linux increases virtual memory

Basic idea: Create a swapfile file--format to swap format--enable virtual disk.

1. Build Swapfile, size 1G

# dd If=/dev/zero of=/var/swapfile bs=10k count=102400

Description: Create a file of size 1G swapfile. "DD" This command,"If" specifies the source,/Dev/zero is an input device that initializes the file with it . "of" specifies the target file, "BS" defines the size of the block, "Count" defines the number of blocks, and these two parameters determine the target file size = bs x count.

2. Format the virtual memory file

# mkswap-f/var/swapfile

3. Activating virtual Memory files

# Swapon/var/swapfile

4. Set boot automatically mount virtual memory file

#vim/etc/fstab

Add code:

/var/swapfile swap swap defaults 0 0

This article is from the "qi" blog, please be sure to keep this source http://garany.blog.51cto.com/7342714/1774639

Linux increases virtual memory