流水线技术性能评价与最佳段数选择

Performance Evaluation of Pipelining and Choice of Suitable Depth

顺序执行时,只有当上一条指令全部执行完毕后,它的下一条指令才能开始执行。所以这种执行方式的功能部件利用率和系统的吞吐率都很低。正因如此,人们基于时间的并行性提出了流水线技术,这是现代计算机系统结构的一种最基本技术。而流水线的段数对流水线的性能以及成本都有最直接的关系,因此通过对流水线性能的分析来确定流水线的最佳段数就在流水线的设计当中显得举足轻重。

When instructions execute in order, only after the previous instruction has been completely finished, the next instruction could begin. In this way, utilization of the functional unit and throughput rate of the system are very low. For this reason, people worked out a new technique named pipelining based on time parallelism, which is a basic technology of modem computer architecture. Quantity of the stage in pipelining has direct relationship with not only the performance of pipeline, but also the cost of it. So it is very important to confirm the best quantity of the stage by analyzing the pipeline.