Differences among bio, NiO and AIO

BIO、NIO、AIO The difference between the three

BIO、NIO、AIO The difference between
In order to ensure the stability and security of the operating system , The address space of a process is divided into user space （User space） And kernel space （Kernel space）

When the application initiates I/O After calling , There are two steps ：

• Kernel wait I/O The device is ready for data
• The kernel copies data from kernel space to user space .

common 3 in IO Model

BIO It's synchronous blocking IO Model

BIO yes Java Tradition io Model , A thread triggers io You must wait for this after the operation io Operation execution completed , I can't do other work during this period .

NIO It belongs to synchronous non blocking IO Model

NIO： A thread triggers io It can return immediately after the operation , But it needs constant rotation training to get execution results .

AIO Asynchronous non blocking IO Model

AIO： A thread triggers io After the operation , It can immediately return to do other work , The kernel system will io The thread will be notified when the operation is completed .

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