When I was just a little boy I started working with Linux. Sometimes I checked load averages with top and look at the fancy numbers. Now the magic is gone and I can actually understand what I'm seeing. But load average has always been a little fuzzy to me. Yesteryear I would go berserk on a load over 1.00 and had some head-banging moments to find out what was wrong. With the introduction of multiprocessing and multicore systems load average can be well over 1.00 and isn't a real problem, as long as it stays under the total number of cores.
Well explained by Andre: http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages
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