oungGen? ? total 6848K, used 3456K [0x0ad30000, 0x0b730000, 0x0b730000)
?eden space 3456K, 100% used [0x0ad30000,0x0b090000,0x0b090000)
?from space 3392K, 0% used [0x0b090000,0x0b090000,0x0b3e0000)
?to? space 3392K, 0% used[0x0b3e0000,0x0b3e0000,0x0b730000)
?ParOldGen? ? ? total 51200K, used 51176K [0x07b30000, 0x0ad30000, 0x0ad30000)
?object space 51200K, 99% used [0x07b30000,0x0ad2a0a0,0x0ad30000)
?PSPermGen? ? ? total 12288K, used 2105K [0x03b30000, 0x04730000, 0x07b30000)
?object space 12288K, 17% used [0x03b30000,0x03d3e4a8,0x04730000)
4、和serial Old收集器的差异
serial Old收集器是串行的进行垃圾回收，而Parallel old收集器是并行的进行垃圾回收。
[Full GC [PSYoungGen:3394K->3394K(6848K)] [ParOldGen: 51048K->51048K(51200K)]54442K->54442K(58048K) [PSPermGen: 2084K->2084K(12288K)], 0.0042710 secs][Times: user=0.00 sys=0.00, real=0.00 secs]
和
[GC [DefNew: 9108K->966K(9216K),0.0049332 secs][Tenured: 46824K->46893K(46920K), 0.0033687 secs] 47800K->47790K(56136K),[Perm : 2086K->2086K(12288K)], 0.0084489 secs] [Times: user=0.02 sys=0.00,real=0.01 secs]
ParOldGen表示是Parallel old在老年代进行回收；
Tenured表示是 serial old在老年代进行回收。