如何并行运行代码?

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问题描述

我如何并行地同时运行这两个独立的循环.

How can i run these two independent loops simultaneously in parallel.

let a1=Seq.map2 (fun a b->(1.0-a)/(a-b)) a2  a3

let b1=Seq.map2 (fun a b->a*b) b2 b3

推荐答案

您可以为此使用标准.NET任务-没有特殊的F#函数或特殊的语法可在后台生成计算:

You can use standard .NET tasks for this - there are no special F# functions or special syntax for spawning a computation in the background:

let a1Work = Task.Factory.StartNew(fun () ->
  Array.map2 (fun a b->(1.0-a)/(a-b)) a2  a3)
let b1 = Array.map2 (fun a b->a*b) b2 b3
let a1 = a1Work.Value

我也将您的Seq.map2更改为Array.map2-序列的计算是惰性的，因此在任务中运行它们实际上不会执行任何操作.使用数组，整个计算将立即完成.

I also changed your Seq.map2 to Array.map2 - computations on sequences are lazy and so running them inside a task would not actually do anything. With arrays, the whole calculation is completed immediately.

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