Linux add swap partition swap increases virtual memory

Amin Linux Learning notes swap partition

First, the role:

Swap partitions are swap partitions that swap with swap When the system is out of physical memory and have a significant impact on the performance of the Web Server by adjusting the swap partition size to improve server performance and save on resource costs.

Second, steps:

1. Create a swap file first

The command is as follows:

DD If=/dev/zero Of=/tmp/swap bs=1024k count=1000

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To view the current system memory:

free-m: ' - M ' is to display the results in theform of 'MB'

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2. format the swap file we created

Command:

Mkswap-f/tmp/swap

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3. Add virtual Memory

Swapon/tmp/swap

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The memory of the current swap partition has been increased by 1000MBcomparedto 1899MB.

4. Uninstalling virtual Memory

Command:swapoff/tmp/swap

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OK Now after uninstalling, see only 899MB .

Linux add swap partition swap increases virtual memory