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I'm not a Ubuntu expert, but I've just ran top on a Ubuntu server box and Terminal has highlighted the results in red, it looks pretty high to me.

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Is this right? I'm only really running Apache and Node.js on there. What can I do to bring down the memory?

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marked as duplicate by voretaq7 Jun 17 '13 at 21:36

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
I've marked this question as a duplicate of our canonical question about how Unix systems report memory utilization. If you believe this is not a duplicate please update your question with additional details (the full output of top sorted by resident size (RES) is a good starting point) and it may be reopened. –  voretaq7 Jun 17 '13 at 21:38

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Don't rely on top to tell you how much free memory you have. Use something like free -m. The way Linux uses (and reports on) memory is that it puts most of the "free" memory into buffer. This results in Top thinking that the memory is used when it reality it's not actually being used and is available for processes that need it.

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