什么算作CPU密集型任务（例如排序，搜索等？） [英] What counts as CPU Intensive tasks (eg. sorting, searching etc?)

问题描述

您认为CPU密集型任务是什么？例如......算法/代码（不是像视频编辑那样的用例等）。原因似乎是不使用NodeJS的主要原因我真正喜欢的主要是CPU密集型任务。重要的是什么呢？例如，它是排序，搜索，横向图形，矩阵乘法吗？

What do you count as a CPU intensive task. In terms of ... an algorithm/code for example (not so much a use case like video editing etc). Reason is it seems the main reason not to use NodeJS something I really like is mainly CPU intensive task. So what counts as that? Is it sorting, search, graph transversal, matrix multiply, for example?

推荐答案

密集或昂贵之类的术语是相对的，并且并不总是很明显哪些活动是CPU密集型的。一般来说，任何非I / O都是CPU。 I / O在node.js中是异步的，所以不是问题。因此，除了I / O价格昂贵之外，我们只剩下一切。

Terms like "intensive" or "expensive" are relative and it isn't always obvious what activities are CPU-intensive. Generally speaking, anything that isn't I/O is CPU. And I/O is asynchronous in node.js, so not a problem. Therefore, we are left with everything except for I/O being expensive.

您选择一般模式的方法是明智的。排序，搜索甚至算法通常都是CPU限制的。当然，你不能消除CPU使用率，但是如果你可以使你的数据库排序而不是你的应用程序代码，你可能会更好。

Your approach to pick general patterns is wise. Sorting, searching, and even algorithms in general are CPU-bound. Of course, you can't eliminate CPU usage, but if you can make your database sort instead of your app code, you may be better off.

我还会保留注意大循环。不会触发任何异步事件的循环是一个瓶颈。当然，人们不能完全避免循环。它们是编程生活中的事实。如果您的循环很短，那么没问题。如果您发现一个运行10,000次的循环，您可能需要考虑使用setTimeout，process.nextTick或单独的节点进程将其分解。

I would also keep an eye out for large loops. A loop that doesn't fire any asynchronous events is a bottleneck. Of course, one cannot entirely avoid loops. They are a fact of life for programming. If your loops are short, then no problem. If you find a loop that runs 10,000 times, you may want to consider breaking it up using setTimeout, process.nextTick, or a separate node process.

10,000是任意选择的。这取决于循环的作用。你的milage可能会有所不同。

10,000 was picked arbitrarily. It depends on what the loop does. Your milage may vary.

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