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The principle behind speculative I/O is to speculatively try to perform I/O before registering the events in the system. This considerably reduces the number of calls to epoll_ctl() and sometimes even epoll_wait(), and manages to increase overall performance by about 10%. The new poller has been called "sepoll". It is used by default on Linux when it works. A corresponding option "nosepoll" and the command line argument "-ds" allow to disable it. |
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