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where proc filesystem mounted under /proc
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"That's it. Not much to see here. The first command writes any cache data that hasn't been written to the disk out to the disk. The second command tells the kernel to drop what's cached. Not much to it. This invalidates the write cache as well as the read cache, which is why we have the sync command first. Supposedly, it is possible to have some cached write data never make it to disk, so use it with caution, and NEVER do it on a production server. You could ... but why take the risk?
As long as you are running a post 2.6.16 kernel,..."
It clears caches from memory. It works fine on CentOS and Fedora. It will show you how much memory you need, for real.
If you can do better, submit your command here.
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