How to expand Linux swap memory

Swap memory mainly means that when the physical memory is insufficient, the system will enable a part of the hard disk space to act as the server memory. By default, there are some setting standards for swap memory, which is also related to the size of physical memory. The specific standards are as follows:

RAM size Swap size Total size after activating Swap 256MB 256MB 512MB
512MB 512MB 1GB
1GB 1GB 2GB
3GB 2GB 5GB
4GB 2GB 6GB
6GB 2GB 8GB
8GB 3GB 11GB
12GB 3GB 15GB
16GB 4GB 20GB
32GB 6GB 38GB
64GB 8GB 72GB
128GB 11GB 139GB

Check the memory space

free -h 

Increase swap space through swap partition files

1. Create a swap partition file

dd if=/dev/zero of=/data2/swapfile bs=1M count=1024

Where bs is the size of each block, count is the number of blocks; bs*count is the size of the swap file: here 1M*1024=1G. You can adjust it as needed. In addition, swapfile is the path of the swap file, which can be modified as needed.

2. Format the swap partition file

mkswap swapfile

The path here should correspond to the previous path.

3. Enable swap partition file

swapon swapfile

4. Add startup

Modify the /etc/fstab file and add or modify this line:

swapfile swap swap defaults 0 0

Note that the paths still need to correspond and must be full paths. The last two are zeros, not capital Os.

This option is optional. If you do not modify the startup configuration, the swap space will be reset after the reboot and the previous configuration will be lost.

When using a Java program, we need to set its maximum heap memory, which is a kind of protection for the system.

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