select vs poll vs epoll

 

I am designing a new server which needs to support thousands of UDP connections (somewhere around 100,000 sessions). Any input or suggestions on which one to use?

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The answer is epoll if you're using Linux, kqueue if you're using FreeBSD or Mac OS X, and i/o completion ports if you're on Windows.

Some additional things you'll (almost certainly) want to research are:

  • Load balancing techniques
  • Multi-threaded networking
  • Database architecture
  • Perfect hash tables

    • Additionally, it is important to note that UDP does not have "connections" as opposed to TCP. It would also be in your best interest to start small and scale larger since debugging network-based solutions can be challenging.

    Linux: epoll FreeBSD: kqueue Windows: ??

    There are wrapper libraries, such as libevent and libev, which can abstract this for you.

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