> total used free shared buffers cached > Mem: 753 750 2 0 11 504 > -/+ buffers/cache: 234 518 > Swap: 784 0 784
Well, that seems reasonable. Cached RAM is pretty high, but that just depends on prior activity - for instance using gcc a lot or other big jobs, the cache will get utilized to "remember" those pages because they may be pressed into service again (like another gcc run). But if processes come along and request RAM, the OS will just reuse what's in buffers and cache. So, your memory isn't 'gone' it is just allocated in case something comes along again that needs it. Buffers (i.e., disk cache) get reused for process memory if there isn't disk activity going on -- if there's plenty of memory available elsewhere, buffers tend to not take up that much space, unless there's a lot of recent disk activity. For instance if you get up in the morning you may notice a large number in buffers first thing in the morning. That's because 'locate' was just run a few hours before -- and that works the disk.
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