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java jvm虛擬機器的引數

  • -XX:PrintHeapAtGC:列印GC前後的詳細堆疊資訊
    輸出形式:
    34.702: [GC {Heap before gc invocations=7:
     def new generation   total 55296K, used 52568K [0x1ebd0000, 0x227d0000, 0x227d0000)
    eden space 49152K,  99% used [0x1ebd0000, 0x21bce430, 0x21bd0000)
    from space 6144K,  55% used [0x221d0000, 0x22527e10, 0x227d0000)
      to   space 6144K,   0% used [0x21bd0000, 0x21bd0000, 0x221d0000)
     tenured generation   total 69632K, used 2696K [0x227d0000, 0x26bd0000, 0x26bd0000)
    the space 69632K,   3% used
     [0x227d0000, 0x22a720f8, 0x22a72200, 0x26bd0000)
     compacting perm gen  total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)
       the space 8192K,  35% used [0x26bd0000, 0x26ea4ba8, 0x26ea4c00, 0x273d0000)
        ro space 8192K,  66% used [0x2abd0000, 0x2b12bcc0, 0x2b12be00, 0x2b3d0000)
        rw space 12288K,  46% used [0x2b3d0000, 0x2b972060, 0x2b972200, 0x2bfd0000)
    34.735: [DefNew: 52568K->3433K(55296K), 0.0072126 secs] 55264K->6615K(124928K)Heap after gc invocations=8:
     def new generation   total 55296K, used 3433K [0x1ebd0000, 0x227d0000, 0x227d0000)
    eden space 49152K,   0% used [0x1ebd0000, 0x1ebd0000, 0x21bd0000)
      from space 6144K,  55% used [0x21bd0000, 0x21f2a5e8, 0x221d0000)
      to   space 6144K,   0% used [0x221d0000, 0x221d0000, 0x227d0000)
     tenured generation   total 69632K, used 3182K [0x227d0000, 0x26bd0000, 0x26bd0000)
    the space 69632K,   4% used 
    [0x227d0000, 0x22aeb958, 0x22aeba00, 0x26bd0000)
     compacting perm gen  total 8192K, used 2898K [0x26bd0000, 0x273d0000, 0x2abd0000)
       the space 8192K,  35% used [0x26bd0000, 0x26ea4ba8, 0x26ea4c00, 0x273d0000)
        ro space 8192K,  66% used [0x2abd0000, 0x2b12bcc0, 0x2b12be00, 0x2b3d0000)
        rw space 12288K,  46% used [0x2b3d0000, 0x2b972060, 0x2b972200, 0x2bfd0000)
    }
    , 0.0757599 secs]