什么时候应该使用多线程？如果不同的线程执行相互独立的任务，多线程会有益吗？ [英] When should you use multithreading? And would multi threading be beneficial if the different threads execute mutually independent tasks?

问题描述

这是我在昨晚被拒绝的采访中无法回答的两个问题。

This were the only two questions I couldn't answer in the interview I got rejected from last night.

推荐答案

Q ：你什么时候应该使用多线程？

Q: When should you use multithreading?

答：你的问题非常广泛。很少有非平凡的系统能够简单，快速，可靠地实现功能。只有一个线程。例如：[挑选一个目标公司销售的典型系统，并选择其功能的几个方面，更好的线程 - 重型CPU，通信，多用户 - 只需选择一些可能的&解释]。

A: "Your question is very broad. There are few non-trivial systems where the functionality can be met simply, quickly and reliably with only one thread. For example: [pick out a typical system that the target company sells and pick out a couple aspects of its function that would be better threaded off - heavy CPU, comms, multi-user - just pick out something likely & explain].

问：如果不同的线程执行相互独立的任务，多线程会有益吗？

Q: Would multithreading be beneficial if the different threads execute mutually independent tasks?

A： 取决于'执行任务'的意思。如果线程以并发方式处理相互独立的数据，多线程肯定会是有益的 - 它减少了对锁的要求，并且以锁的数量超线性方式增加了死锁的概率。 OTOH，执行相同代码的线程没有问题，这是安全且非常常见的。

A: "Depends on what you mean by 'executing tasks'. Multithreading would surely be beneficial if the threads process mutually independent data in a concurrent fashion - it reduces requirements for locks and probabilty of deadlocks increases in a super-linear fashion with the number of locks. OTOH, there is no issue with threads executing the same code, this is safe and very common."

Rgds，
Martin

Rgds, Martin

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