First and the most important part of optimizing a computer program is to find out where to optimize, which portion or which module of the program is running slow or using huge memory.
首先也是最重要的是要找出哪里需要优化，程序的那一部分或者那个模块运行速度慢或者使用大量内存。
This program supports people with access to chat rooms, first through the "Settings" module to set user network information, and to opt for chatting to chat.
此程序支持多人一起进入聊天室，首先要通过“设置”模块设置用户网络信息，然后才能选择聊天对象进行聊天。
While writing a user space program to execute a system call is the "proper" way to do it, when you just want to test a system call module, it's annoying to have to write an additional program first.
当你想去测试一个系统调用模块时，编写一个用户空间的程序来执行一个系统调用是种“正规”的方法。但首先要编写额外的程序，这是恼人的事情。怎样才可以执行一个系统调用而又不用编写用户空间的程序呢？
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