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A niggle about linearity

A niggle about linearity

Posted May 13, 2011 13:13 UTC (Fri) by andrewt (subscriber, #5703)
In reply to: A niggle about linearity by jberkus
Parent article: Scale Fail (part 1)

Be careful, as CPU utilization does not always correlate to work done. In fact, CPUs with hyper-threading have quite a surprise when they cross the 50% utilization point -you might get 25% more transactions as the CPU goes to 100%, and not another 100% transactions as one would expect from simple arithmetic. Even without hyper-threading, there's enough other things to bust the whole linearity thing like cache warmth, etc.


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