For example, a compiler may choose to optimize a loop index variable by storing it in a register, or the cache may delay flushing a new value of a variable to main memory until a more opportune time.

例如，编译器为了优化一个循环索引变量，可能会选择把它存储到一个寄存器中，或者缓存会延迟到一个更适合的时间，才把一个新的变量值存入主存。

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But it is hard to realize the dual-loop instantaneous control with digital scheme, because there is delay time of sampling and computing and lack of real-time regulation for digital control.

数字控制器存在采样与计算延时，实时控制性差，采用数字控制器实现双闭环瞬时值控制比较困难。

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Aiming at the difficulties in analyzing and designing this kind of asynchronous systems, we investigate the continuity property of its' close loop performance on the time delay of sampler and hold.

针对这类非周期异步多速率系统分析、设计困难这一问题，研究了其闭环系统性能关于采样器、保持器时间延迟的连续性问题。

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