vmoption

vmoption在线教程

查看，更新VM诊断相关的参数

使用参考

查看所有的option

  1. [arthas@56963]$ vmoption
  2.  KEY                    VALUE                   ORIGIN                 WRITEABLE
  3. ---------------------------------------------------------------------------------------------
  4.  HeapDumpBeforeFullGC   false                   DEFAULT                true
  5.  HeapDumpAfterFullGC    false                   DEFAULT                true
  6.  HeapDumpOnOutOfMemory  false                   DEFAULT                true
  7.  Error
  8.  HeapDumpPath                                   DEFAULT                true
  9.  CMSAbortablePrecleanW  100                     DEFAULT                true
  10.  aitMillis
  11.  CMSWaitDuration        2000                    DEFAULT                true
  12.  CMSTriggerInterval     -1                      DEFAULT                true
  13.  PrintGC                false                   DEFAULT                true
  14.  PrintGCDetails         true                    MANAGEMENT             true
  15.  PrintGCDateStamps      false                   DEFAULT                true
  16.  PrintGCTimeStamps      false                   DEFAULT                true
  17.  PrintGCID              false                   DEFAULT                true
  18.  PrintClassHistogramBe  false                   DEFAULT                true
  19.  foreFullGC
  20.  PrintClassHistogramAf  false                   DEFAULT                true
  21.  terFullGC
  22.  PrintClassHistogram    false                   DEFAULT                true
  23.  MinHeapFreeRatio       0                       DEFAULT                true
  24.  MaxHeapFreeRatio       100                     DEFAULT                true
  25.  PrintConcurrentLocks   false                   DEFAULT                true

查看指定的option

  1. [arthas@56963]$ vmoption PrintGCDetails
  2.  KEY                    VALUE                   ORIGIN                 WRITEABLE
  3. ---------------------------------------------------------------------------------------------
  4.  PrintGCDetails         false                   MANAGEMENT             true

更新指定的option

  1. [arthas@56963]$ vmoption PrintGCDetails true
  2. Successfully updated the vm option.
  3. PrintGCDetails=true