Flushing cached memory on a LINUX machine

Linux memory management system is so wise to keep the details of data that was used recently in cache memory

We can flush, the cached memory using the below commands:

Case 1:  To free pagecache, dentries and inodes in cache memory
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sync; echo 3 > /proc/sys/vm/drop_caches
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Case 2: To free dentries and inodes use following command
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sync; echo 2 > /proc/sys/vm/drop_caches
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Case 3: To free pagecache only use following command
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sync; echo 1 > /proc/sys/vm/drop_caches
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So, if you need to spontaneously free up memory for some application. You can use any of the above commands.

Kool :)