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jstat命令选项-gcold和-gcpermcapacity的补充说明 #755

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Apr 26, 2020
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jstat命令选项-gcold和-gcpermcapacity的补充说明 #755

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4 changes: 2 additions & 2 deletions docs/java/jvm/JDK监控和故障处理工具总结.md
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Expand Up @@ -83,9 +83,9 @@ jstat -<option> [-t] [-h<lines>] <vmid> [<interval> [<count>]]
- `jstat -gccapacity vmid` ：显示各个代的容量及使用情况；
- `jstat -gcnew vmid` ：显示新生代信息；
- `jstat -gcnewcapcacity vmid` ：显示新生代大小与使用情况；
- `jstat -gcold vmid` ：显示老年代和永久代的信息；
- `jstat -gcold vmid` ：显示老年代和永久代的行为统计，从jdk1.8开始,该选项仅表示老年代，因为永久代被移除了；
- `jstat -gcoldcapacity vmid` ：显示老年代的大小；
- `jstat -gcpermcapacity vmid` ：显示永久代大小；
- `jstat -gcpermcapacity vmid` ：显示永久代大小，从jdk1.8开始,该选项不存在了，因为永久代被移除了；
- `jstat -gcutil vmid` ：显示垃圾收集信息；

另外，加上 `-t`参数可以在输出信息上加一个 Timestamp 列，显示程序的运行时间。
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