如何在Haskell中获得程序的运行时间 [英] How to get a program's running time in Haskell

问题描述

如何通过Haskell中的系统时间函数获取程序的运行时间？我想测量整个程序和/或个别函数的执行时间。 解决方案

假设你不只是想要测量程序的总运行时间，如下所示：

  $ time ./A 
  

然后你可以在Haskell中进行多种计算：

• 基本时间表（例如在
li> 定时循环

要获得更具统计性的测量结果，请考虑

• Criterion软件包。

最后，在所有情况下，您都需要考虑懒惰评估：您是否想要衡量完全评估您生成的任何数据的成本，还是仅仅评估其最外层的构造函数？

How can I go about getting a program's running time through system time functions in Haskell? I would like to measure the execution time of a whole program and/or an individual function.

解决方案

Assuming you don't just want to measure the total running time of your program, like so:

 $ time ./A

Then you can time a computation a number of ways in Haskell:

• Basic timing (e.g. as in the timeit package)
• Timing in cycles

For more statistically sound measurement, consider

• The Criterion package.

Finally, in all cases, you need to think about lazy evaluation: do you want to measure the cost of fully evaluating whatever data you produce, or just to its outermost constructor?

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