Java jstat 命令查看 JVM 垃圾回收情况
JVM jstat 诊断工具 About 3,180 wordsjstat 选项
使用jstat -options
查看支持的选项
- class:类加载统计(Displays statistics about the behavior of the class loader.)
- compiler:编译统计(Displays statistics about the behavior of the Java HotSpot VM Just-in-Time compiler.)
- gc:垃圾回收统计(Displays statistics about the behavior of the garbage collected heap.)
- gccapacity:堆内存统计(Displays statistics about the capacities of the generations and their corresponding spaces.
- gccause:垃圾回收原因(Displays a summary about garbage collection statistics (same as -gcutil), with the cause of the last and current (when applicable) garbage collection events.)
- gcnew:新生代垃圾回收统计(Displays statistics of the behavior of the new generation.)
- gcnewcapacity:新生代内存统计(Displays statistics about the sizes of the new generations and its corresponding spaces.)
- gcold:老年代垃圾回收统计(Displays statistics about the behavior of the old generation and metaspace statistics.)
- gcoldcapacity:老年代内存统计(Displays statistics about the sizes of the old generation.)
- gcmetacapacity:元数据空间统计(Displays statistics about the sizes of the metaspace.)
- gcutil:总结垃圾回收统计(Displays a summary about garbage collection statistics.)
- printcompilation:JVM编译方法统计(Displays Java HotSpot VM compilation method statistics.)
最常用选项
gcutil
jstat -gcutil <pid> 2000
- S0:幸存区1当前使用比例(Survivor space 0 utilization as a percentage of the space's current capacity.)
- S1:幸存区2当前使用比例(Survivor space 1 utilization as a percentage of the space's current capacity.)
- E:伊甸园区使用比例(Eden space utilization as a percentage of the space's current capacity.)
- O:老年代使用比例(Old space utilization as a percentage of the space's current capacity.)
- M:元数据区使用比例(Metaspace utilization as a percentage of the space's current capacity.)
- CCS:压缩使用比例(Compressed class space utilization as a percentage.)
- YGC:年轻代垃圾回收次数(Number of young generation GC events.)
- YGCT:年轻代垃圾回收消耗时间Young generation garbage collection time.
- FGC:老年代垃圾回收次数(Number of full GC events.)
- FGCT:老年代垃圾回收消耗时间(Full garbage collection time.)
- GCT:垃圾回收消耗总时间(Total garbage collection time.)
gccause (推荐使用)
gcutil
拥有的输出列gccause
也都拥有,还额外多了最后一次GC
原因和当前GC
原因。
jstat -gccause <pid> 2000
LGCC
:最后一次GC
原因(Cause of last garbage collection)GCC
:当前GC
原因(Cause of current garbage collection)
[root@root ~]jstat -gccause 14292 2000
S0 S1 E O M CCS YGC YGCT FGC FGCT GCT LGCC GCC
0.00 100.00 47.64 19.39 96.63 92.26 3211 100.224 0 0.000 100.224 G1 Evacuation Pause No GC
0.00 100.00 47.81 19.39 96.63 92.26 3211 100.224 0 0.000 100.224 G1 Evacuation Pause No GC
0.00 100.00 48.15 19.39 96.63 92.26 3211 100.224 0 0.000 100.224 G1 Evacuation Pause No GC
0.00 100.00 48.31 19.39 96.63 92.26 3211 100.224 0 0.000 100.224 G1 Evacuation Pause No GC
0.00 100.00 48.48 19.39 96.63 92.26 3211 100.224 0 0.000 100.224 G1 Evacuation Pause No GC
0.00 100.00 48.65 19.39 96.63 92.26 3211 100.224 0 0.000 100.224 G1 Evacuation Pause No GC
0.00 100.00 48.90 19.39 96.63 92.26 3211 100.224 0 0.000 100.224 G1 Evacuation Pause No GC
Views: 5,926 · Posted: 2019-09-06
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