2. -XX:+PrintGCDetails • Print at Full GC. • Summary at the end of the run. ! 2014-05-17T15:09:24.581-0900: 3.168: [Full GC (Metadata GC Threshold) [PSYoungGen: 1371K->0K(36864K)] [ParOldGen: 10609K->8518K(64000K)] 11980K->8518K(100864K), [Metaspace: 19037K->19037K(1067008K)], 0.0748560 secs] [Times: user=0.22 sys=0.01, real=0.07 secs] ! : ! Heap PSYoungGen total 64512K, used 51555K [0x00000007b55
![Tools for Metaspace](https://cdn-ak-scissors.b.st-hatena.com/image/square/ef1dda52a6212c376f29da25d44a78af700ad6c3/height=288;version=1;width=512/https%3A%2F%2Fcdn.slidesharecdn.com%2Fss_thumbnails%2Ftoolsformetaspace-140519113230-phpapp01-thumbnail.jpg%3Fwidth%3D640%26height%3D640%26fit%3Dbounds)