If poll is called in a loop, these expensive system calls involved in polling can dramatically affect the overall performance when a large number of file descriptors are monitored.

在监视大量文件描述符时，如果在循环中调用poll ，poll所涉及的这些高成本的系统调用会严重影响总体性能。

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If poll is called in a loop, these expensive system calls involved in polling can dramatically affect the overall performance when a large number of file descriptors are monitored.

在监视大量文件描述符时，如果在循环中调用poll ，poll所涉及的这些高成本的系统调用会严重影响总体性能。

youdao