问题描述
我已经配置java将垃圾收集信息转储到日志中（，但没有找到明确的解释。
我有一些合理的猜测，但我正在寻找答案，它们为条目中的数字提供了严格的定义，并由可靠来源提供支持。所有答案的自动+1引用sun文档。我的问题是：
- PSYoungGen是指什么？我认为这与以前的（年轻？）一代有关，但究竟是什么？
- 数字的第二个三元组与第一个三元组的区别是什么？
- 为什么名称（PSYoungGen）但不是第二？
- 三元组中每个数字（内存大小）的含义是什么。例如在109884K-> 14201K（139904K）中，是GC 109884k之前的内存，然后减少到14201K。第三个数字如何相关？为什么我们需要第二组数字？
我不确定为什么在你的PSYoungGen中存在PSYoungGen;你改变了垃圾回收器吗？
I have configured java to dump garbage collection information into the logs (verbose GC). I am unsure of what the garbage collection entries in the logs mean. A sample of these entries are posted below. I've searched around on Google and have not found solid explanations.
I have some reasonable guesses, but I'm looking for answers which provide strict definitions of what the numbers in the entries mean, backed up by credible sources. An automatic +1 to all answers which cite sun documentation. My questions are:
- What does PSYoungGen refer to? I assume it has something to do with the previous (younger?) generation, but what exactly?
- What is the difference between the second triplet of numbers and the first?
- Why is a name(PSYoungGen) specified for the first triplet of numbers but not the second?
- What does each number (memory size) in the triplet mean. For example in 109884K->14201K(139904K), is the memory before GC 109884k and then it is reduced to 14201K. How is the third number relevant? Why would we require a second set of numbers?
Most of it is explained in the GC Tuning Guide (which you would do well to read anyway).
I'm not certain why there's a PSYoungGen in yours; did you change the garbage collector?
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