Clearing the buffers and caches on Linux.

I have been playing around with a couple of modules and monitoring their memory usage.  I wanted to clear the caches and buffers to give me a clearer picture of memory usage.

This command is handy for clearing them out.

When you run

after running the above command you will see the buffers and cached values are either zero or very low. and the Total/Used/Free columns are much clearer.

Please do NOT do this on a live production server unless you know what you are doing.

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