如果系统将过多的时间花在存在开销的任务上(比如内存交换)，则需要指定更少数量的线程。

If your system spends too much time on overhead tasks, such as swapping memory, you might need to specify a lower number of threads.

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在具有许多活动网络连接的服务器上，大型 TCB 表可以降低系统定位特定 TCB 的时间开销。

On a server with many active network connections, a large TCB table can reduce the amount of time that the system spends to locate a particular TCB.

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开销，如系统当机时间、会议和回复电子邮件

Overhead such as system down time, meetings, and answering e-mail

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