一文理解JVM虚拟机（内存、垃圾回收、性能优化）解决面试中遇到问题

Application time: 0.3440086 seconds Total time for which application threads were stopped: 0.0620105 seconds Application time: 0.2100691 seconds Total time for which application threads were stopped: 0.0890223 seconds

得知应用程序在前344毫秒中是在处理实际工作的，然后将所有线程暂停了62毫秒，紧接着又工作了210ms，然后又暂停了89ms。

2796146K->2049K(1784832K)] 4171400K->2049K(3171840K), [Metaspace: 3134K->3134K(1056768K)], 0.0571841 secs] [Times: user=0.02 sys=0.04, real=0.06 secs]Total time for which application threads were stopped: 0.0572646 seconds, Stopping threads took: 0.0000088 seconds

应用线程被强制暂停了57ms来进行垃圾回收。其中又有8ms是用来等待所有的应用线程都到达安全点。

只要设置-XX:+PrintGCDetails 就会自动带上-verbose:gc和-XX:+PrintGC

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