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vmoption
===
> 查看，
### 使用参考
#### 查看所有的option
```bash
[arthas@56963]$ vmoption
KEY VALUE ORIGIN WRITEABLE
---------------------------------------------------------------------------------------------
HeapDumpBeforeFullGC false DEFAULT true
HeapDumpAfterFullGC false DEFAULT true
HeapDumpOnOutOfMemory false DEFAULT true
Error
HeapDumpPath DEFAULT true
CMSAbortablePrecleanW 100 DEFAULT true
aitMillis
CMSWaitDuration 2000 DEFAULT true
CMSTriggerInterval -1 DEFAULT true
PrintGC false DEFAULT true
PrintGCDetails true MANAGEMENT true
PrintGCDateStamps false DEFAULT true
PrintGCTimeStamps false DEFAULT true
PrintGCID false DEFAULT true
PrintClassHistogramBe false DEFAULT true
foreFullGC
PrintClassHistogramAf false DEFAULT true
terFullGC
PrintClassHistogram false DEFAULT true
MinHeapFreeRatio 0 DEFAULT true
MaxHeapFreeRatio 100 DEFAULT true
PrintConcurrentLocks false DEFAULT true
```
#### 查看指定的option
```bash
[arthas@56963]$ vmoption PrintGCDetails
KEY VALUE ORIGIN WRITEABLE
---------------------------------------------------------------------------------------------
PrintGCDetails false MANAGEMENT true
```
#### 更新指定的option
```bash
[arthas@56963]$ vmoption PrintGCDetails true
Successfully updated the vm option.
PrintGCDetails=true
```