Available = "Free" (unused) + Cached
Posted Jun 13, 2006 6:30 UTC (Tue) by AnswerGuy
In reply to: Memory footprint
Parent article: Live CDs Part II: Desktop Replacements
I teach my students that the best, simplest approximation of their available memory is the "cached" *plus* "free" (which I translate to "unused" to better explain the meaning in top and the "free" command).
Yes, it's an simplication; but it's a useful one.
Then I teach them to watch the si and so (swap in and swap out) columns under vmstat for at least a couple minutes of sustained three digit values before declaring their system to be "out of memory."
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