Actual Free Memory in Linux = Free+ Buffer+Cache
Linux uses RAM to load the Disk data in RAM (emory) as reading data from memory is faster. As the needs for memory to other process increases it shrinks the cahced data accordingly.
http://blog.scoutapp.com/articles/2010/10/06/determining-free-memory-on-linux
Linux uses RAM to load the Disk data in RAM (emory) as reading data from memory is faster. As the needs for memory to other process increases it shrinks the cahced data accordingly.
http://blog.scoutapp.com/articles/2010/10/06/determining-free-memory-on-linux
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