“But wait doesn’t hyperthreading double the processing power of my CPU?” you may ask.
In this case it appears to top, sar, mpstat and uptime that there are 8 CPUs, when in reality there are only 4. When hyperthreading is enabled, Linux utilities believe that the number of CPUs is actually twice the number actually present. The CPU is an Intel i7-4790S with hyperthreading enabled. Why is that a problem? It is a problem because this machine does not have 8 CPUs it has only 4. Notice that mpstat and sar both report 8 CPUs, and that is the crux of the problem. Sar does not show the load average, but does report what it thinks is CPU utilization. The correct load number is probably closer to 2.4. Following are the output of several tools that provide CPU utilization metrics: top Once upon a time CPU utilization was quite a useful metric.
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