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Memory analysis isn't right on this. real difference is:

561M - 487M(cached) - 23M(buffers) = 51M

vs.

50M - 21M(cached) - 6M(buffers) = 23M

2x difference (4M of which is vmtoolsd)

Yes, this is how you're supposed to read memory usage in 'top' and 'free'. One must substract caches and buffers from the 'free memory' value. A lot of people read the values wrong and think that they're running out of memory.

Obviously there is the man page, but could you explain that a little more fully? (or link to something that does)

I think I may have been misreading the numbers, but I don't quite follow your recommended approach.

http://www.linuxatemyram.com explains it.

Thanks! Exactly what I needed and entertaining too!

I'm wondering how a blog labeling itself "Advanced persistent cybersecurity" does not know this.

Because, as the OP says, he spends more time programming than doing SysOps.

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