gcold年老代和永生代行为统计。

Statistics of the behavior of the old and permanent generations.

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分代垃圾收集器把堆分成多代；多数JVM使用两代，“年轻代”和“年老代”。

A generational garbage collector divides the heap into multiple generations; most JVMs use two generations, a "young" and an "old" generation.

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还应该分析gc日志，以了解年老代空间回收的频率；最优的分代应用程序进行年老代空间回收操作的频率应该非常低。

You should also analyze GC logs to understand how frequently the tenured space gets collected; an optimal generational application will have very infrequent collection in the tenured space.

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