HOW TO CLEAR RAM MEMORY CACHE, BUFFER AND SWAP SPACE ON Ubuntu 20.04,16.04,17.10,14.04,12.04 Linux

How To CLEAR RAM MEMORY CACHE, BUFFER AND SWAP SPACE ON UBUNTU 20.04,12.04,14.04,1604,17.04,18.04 Linux,Kubuntu, Kalilinux, Mint

How To CLEAR RAM MEMORY CACHE, BUFFER AND SWAP SPACE ON UBUNTU 20.04.
How To CLEAR RAM MEMORY CACHE, BUFFER AND SWAP SPACE ON linux Mint 20.
If you want to clear Swap space, you may like to run the below command.

swapoff -a && swapon -a

Many times systems faced low memory issues of Linux systems running a while. The reason is that Linux uses so much memory for disk cache is because the RAM is wasted if it isn’t used. Cache is used to keep data to use frequently by the operating system. Reading data from cache if 1000’s time faster than reading data from hard drive.
It’s good for the os to get data from the cache in memory. But if any data not found in the cache, it reads from hard disk. So it’s no problem to flush cache memory. This article has details about how to Flush Memory Cache on Linux Server