空闲的资源，加上J2EE 平台的崛起，迎来了云计算的概念：应用服务虚拟化。
The concept of under-utilized resources, together with the rise of J2EE platform, gave rise to the precursor of cloud computing: application server virtualization.
仅当您知道存在足够的空闲系统资源时才调整线程的数量。
Only adjust the number of threads if you know that there are enough spare system resources.
如果应用程序处于空闲状态，则不会占用线程这样的有限资源。
If the application is idle, it should not occupy finite resources such as threads.
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