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什么时候最好编写单线程事件服务器等
原标题:When its better to write singlethreaded event servers, etc

什么时候写单线程事件、多线程或分叉服务器更好?哪种方法更适合:

  1. web server who serves statics
  2. web server who serves statics and proxy requests to other http servers
  3. previous plus this servers makes some logic in C without attending to harddrive or network
  4. previous plus makes some requests to MySQL?

例如,该语言是C/C++。我非常想回避这个问题。非常感谢。

问题回答

考虑到现代处理器是多核的,您应该始终在这样的假设下编写代码,即它可能在某个时候是多线程的(在可能的情况下使事物可重入,在不可能的情况中,使用接口,使其可以很容易地放入执行必要锁定的实现中)。

如果您每秒的查询数(qp)相当少,那么您可能可以使用单线程事件服务器。不过,我仍然建议以允许多线程的方式编写代码,以防您增加qp并需要处理更多事件。

单线程服务器可以通过将其转换为分叉服务器来进行扩展;然而,分叉服务器使用更多的资源——当使用分叉服务器时,所有请求共用的任何内存最终都会在内存中重复,而在单个多线程服务器中只需要一个该数据的副本。此外,如果多线程服务器利用了真正的并行性,并且实际上可以并行执行单个请求处理的多个部分,那么它可以提供更低的延迟。





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