Another good rule of thumb is that anything over 4G of swap is probably unnecessary if you are just using it as a RAM fallback.
Generally, an amount equal to or double the amount of RAM on your system is a good starting point. Your usage will probably be different.Īlthough there are many opinions about the appropriate size of a swap space, it really depends on your personal preferences and your application requirements. We have plenty of space available in this example (only 1.4G used). The device with / in the Mounted on column is our disk in this case. OutputFilesystem Size Used Avail Use% Mounted on You can verify that there is no active swap using the free utility: If you don’t get back any output, this means your system does not have swap space available currently. We can see if the system has any configured swap by typing: It is possible to have multiple swap files or swap partitions, but generally one should be enough. Step 1 – Checking the System for Swap Informationīefore we begin, we can check if the system already has some swap space available. Overall, having swap space as a fallback for when your system’s RAM is depleted can be a good safety net against out-of-memory exceptions on systems with non-SSD storage available. The information written to disk will be significantly slower than information kept in RAM, but the operating system will prefer to keep running application data in memory and use swap for the older data. The swap space on the hard drive will be used mainly when there is no longer sufficient space in RAM to hold in-use application data.
This lets you increase the amount of information that your server can keep in its working memory, with some caveats. Swap is a portion of hard drive storage that has been set aside for the operating system to temporarily store data that it can no longer hold in RAM.
In this guide, we will cover how to add a swap file to an Ubuntu 20.04 server. One way to guard against out-of-memory errors in applications is to add some swap space to your server.
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