Hyperthreading enables the Dual Core CPU to handle 4 threads at once (for a better usage of the pipeline).
超线程的双核心CPU可以处理4个线程在一次(一管道更好的使用)。
When a query is executed, the work is evenly spilt among threads. But with both hyperthreading and virtualization, those threads are not running at a consistent speed.
当执行一个查询时，所有的工作会被平均地分配到不同的线程中，但在超线程（hypertheading）或是虚拟化的环境中，这些线程并不是按照一致的速度运行的。
The memory barrier performance of a single Intel P4 with hyperthreading (two processor cores on one die) is faster than with two P4s, and both have different performance characteristics than Sparc.
一个超线程（一个模具上有两个处理器核心）IntelP4的内存壁垒性能（memorybarrier performance）要快于两个P4，而两者的性能特征又不同于 Sparc。
The memory barrier performance of a single Intel P4 with hyperthreading (two processor cores on one die) is faster than with two P4s, and both have different performance characteristics than Sparc.
一个超线程（一个模具上有两个处理器核心）IntelP4的内存壁垒性能（memorybarrier performance）要快于两个P4，而两者的性能特征又不同于 Sparc。
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