记录一次jvm内存回收情况

Heap
 PSYoungGen      total 328192K, used 302348K [0x00000000e0000000, 0x00000000f5500000, 0x0000000100000000)
  eden space 308224K, 95% used [0x00000000e0000000,0x00000000f1e400e0,0x00000000f2d00000)
  from space 19968K, 46% used [0x00000000f2d00000,0x00000000f36031a0,0x00000000f4080000)
  to   space 18944K, 0% used [0x00000000f4280000,0x00000000f4280000,0x00000000f5500000)
 ParOldGen       total 704512K, used 136185K [0x0000000080000000, 0x00000000ab000000, 0x00000000e0000000)
  object space 704512K, 19% used [0x0000000080000000,0x00000000884fe6e8,0x00000000ab000000)
 Metaspace       used 98932K, capacity 103569K, committed 103808K, reserved 1142784K
  class space    used 10583K, capacity 11327K, committed 11392K, reserved 1048576K