Explore the method of linux swap memory expansion

swap swap memory mainly means that when the physical memory is not enough, the system will enable part of the hard disk space to act as server memory. By default, swap memory will have some setting standards, which are related to The size of physical memory is also related. The specific standards are as follows:

Ram大小 Swap大小 激活Swap后合计大小 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

View memory space

free -h

Increase swap space through swap partition file

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 and can be modified according to needs.

2. Format the swap partition file

mkswap swapfile

The path here must correspond to the previous path.

3. Enable swap partition file

swapon swapfile

4. Add boot function

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

swapfile swap swap defaults 0 0

Note that the path still needs to correspond, and it must be the full path. The last two are zeros, not a capital O.

This item is not required. If you do not modify the startup configuration, the swap space will be reset after the restart 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.

This concludes this article about the expansion of linux~swap swap memory. For more information about the expansion of linux~swap swap memory, please search Script House’s previous articles or continue browsing the following Related articles I hope you will support Script House more in the future!

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