09-27-2011
Yes, 80% of your memory are used (but not reserved). But really only about 13% are reserved by applications, with the other 67% being used as cache and buffer to avoid time-consuming disk reads. That is, those 67% are used to keep libraries and files in a fast access location (RAM is much much faster than any disk, even SSDs), and that space is automatically re-assigned should any application require it.
So in order to get the amount of memory reserved by applications ("used"), you'll have to substract the buffers and cache numbers from the used number.
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