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How to understand the memory usage and load average in linux server

I was reading this question, and it left me wondering what system load is. What does it actually measure?

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marked as duplicate by Caleb, Sven, jscott, Chopper3 Jun 28 '11 at 14:57

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.

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This question has been asked before, and there are several duplicates. Additionally the answer is found in several of the answers and comments under question you linked. – Caleb Jun 28 '11 at 14:56

It measures the inability for processes to get their slice of the CPU pie in a timely manner.

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