How do I clear swap usage in Linux? To clear the swap memory on your system, you simply need to cycle off the swap. This moves all data from swap memory back into RAM. It also means that you need to be sure you have the RAM to support this operation. An easy way to do this is to run ‘free -m’ to see what is being used in swap and in RAM.
Can I delete Linux swap? Edit the /etc/vfstab file and delete the entry for the swap file. Recover the disk space so that you can use it for something else. If the swap space is a file, remove it. Or, if the swap space is on a separate slice and you are sure you will not need it again, make a new file system and mount the file system.
Is Linux swap necessary? Can you use Linux without swap? Yes, you can, especially if your system has plenty of RAM. But as explained in the previous section, a little bit of swap is always advisable. In fact, a distribution like Ubuntu automatically creates a swap file of 2 GB in size.
What happens if swap memory is full? If your system is using swap a lot, it will affect performance of the system overall as traditional drives are much slower than RAM. You either need to configure and adjust some of your applications to use less resources, or add more RAM.