Many Linux systems, servers and VPS run on low memory and over time you will see a degradation of speed and responsiveness.
By default, Linux got excellent Memory Management and it knows when to clean up cache to free up enough Memory to execute the next command. However, saying that, more new features being added to Linux everyday and when you are playing games, running a Web Server, a Database (i.e. MySQL, PostgreSQL, MariaDB etc.), Network Storage (NAS / SAN ), you will see there’s a drop on speed and responsiveness. By deleting and cleaning pagecache, dentries and inodes related cache data from Memory, you can get free up some of your Memory (RAM) which then makes rest of system work bit faster. This article will show you 3 different options to delete and clean cache to free up memory on your slow Linux server and small VPS’s.