何为不带缓冲的I/O——read & write
2015-03-11 19:37
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所有的磁盘I/O都要经过内核的块缓冲区(也称为内核的缓冲区高速缓存),唯一例外的是对原始磁盘设备的I/O。
既然read或write的数据都要被内核缓冲,那么术语“不带缓冲的I/O”指的是在用户的进程中对这两个函数不会自动缓冲,每次read或write就要进行一次系统调用。
既然read或write的数据都要被内核缓冲,那么术语“不带缓冲的I/O”指的是在用户的进程中对这两个函数不会自动缓冲,每次read或write就要进行一次系统调用。
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