Why does nginx adopt epoll mechanism instead of traditional mechanisms such as select and poll?

as you said, if the number of active socket is relatively high, the performance of epoll is not as good as that of select. But for the web server, it is not an online game, and it doesn't need socket to be connected for a long time. That is to say, what you assume rarely happens; In fact, you can have a lot of four advantages of epoll. When and what scheme to use is a matter of different opinions. Sometimes advantages may be a disaster.