问题描述
几年前，在Windows环境下，我做了一些测试，通过让CPU的计算密集型+内存访问密集型+ I / O访问密集型应用程序运行多个实例。我开发了两个版本：一个是多任务处理下运行，另一种是在多线程运行
。我发现性能多的多处理好。我读别的地方（但我不记得站点）。
其中规定，原因是在多线程，它们是激战的单条内存流水线和I / O管道，相对于多处理器使得性能更差
不过，我找不到那篇文章了。我想知道，直到今天，下面是否仍然适用？
It depends on how much the various threads or processes (I'll be using the collective term "tasks" for both of them) need to communicate, especially by sharing memory: that's easy, cheap and fast for threads, but not at all for processes, so, if a lot of it is going on, I bet processes' performance is not going to beat threads'.
Also, processes (esp. on Windows) are "heavier" to get started, so if a lot of "task starts" occur, again threads can easily beat processes in terms of performance.
Next, you can have CPUs with "hyperthreading", which can run (at least) two threads on a core very rapidly -- but, not processes (since the "hyperthreaded" threads cannot be using distinct address spaces) -- yet another case in which threads can win performance-wise.
If none of these considerations apply, then the race should be no better than a tie, anyway.
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