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Hopefully you are now convinced that Linux didn't just eat your ram. Here are some interesting things you can do to learn how the disk cache works. Note: The examples shown are for and from 2009 era hardware without SSDs. You may have to multiply several of the example numbers here by 10 to see an appreciable effect. Effects of disk cache on application memory allocation Since I've already promise

What's going on? Like all modern operating systems, Linux is borrowing unused memory for disk caching. This makes it look like you are low on "free" memory, but you are not! Everything is fine! Why is it doing this? Disk caching makes the system much faster and more responsive! There are no downsides, except for confusing users who are new to computing, and unfamiliar with the concept of a filesys