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67 lines
2.5 KiB
Markdown
67 lines
2.5 KiB
Markdown
# vmoption
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[`vmoption`在线教程](https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-vmoption)
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::: tip
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查看，更新 VM 诊断相关的参数
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:::
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## 使用参考
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### 查看所有的 option
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```bash
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[arthas@56963]$ vmoption
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KEY VALUE ORIGIN WRITEABLE
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HeapDumpBeforeFullGC false DEFAULT true
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HeapDumpAfterFullGC false DEFAULT true
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HeapDumpOnOutOfMemory false DEFAULT true
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Error
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HeapDumpPath DEFAULT true
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CMSAbortablePrecleanW 100 DEFAULT true
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aitMillis
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CMSWaitDuration 2000 DEFAULT true
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CMSTriggerInterval -1 DEFAULT true
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PrintGC false DEFAULT true
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PrintGCDetails true MANAGEMENT true
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PrintGCDateStamps false DEFAULT true
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PrintGCTimeStamps false DEFAULT true
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PrintGCID false DEFAULT true
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PrintClassHistogramBe false DEFAULT true
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foreFullGC
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PrintClassHistogramAf false DEFAULT true
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terFullGC
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PrintClassHistogram false DEFAULT true
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MinHeapFreeRatio 0 DEFAULT true
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MaxHeapFreeRatio 100 DEFAULT true
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PrintConcurrentLocks false DEFAULT true
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```
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### 查看指定的 option
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```bash
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$ vmoption PrintGC
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KEY VALUE ORIGIN WRITEABLE
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PrintGC false MANAGEMENT true
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```
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### 更新指定的 option
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```bash
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$ vmoption PrintGC true
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Successfully updated the vm option.
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NAME BEFORE-VALUE AFTER-VALUE
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------------------------------------
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PrintGC false true
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```
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```bash
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$ vmoption PrintGCDetails true
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Successfully updated the vm option.
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NAME BEFORE-VALUE AFTER-VALUE
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-------------------------------------------
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PrintGCDetails false true
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```
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