由于虚拟化已经越来越重要并且得到更多的应用，因而需要四核来支持运行一个系统上的多负载或者一个服务器上的多重应用和。
As virtualization becomes more important and widely implemented, businesses will need servers with quad-core.
我们计划新的系统将会使用几年，所以目标是至少支持多一个数量级的负载。
As we want the new system to last for several years, the goal was to support at least an order of magnitude more load.
在多cpu(或多核)系统中，需要将平均负载除以cpu的个数。
In a multi-CPU (or multi-core) system, divide the load average by the number of CPUs.
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