Deep understanding of Java Virtual Machines-fourth Chapter

4th. Virtual machine performance monitoring and fault handling tools

JPS Virtual machine Process Health tool

Jstat Virtual Machine Statistics Monitor utility JVM Statistics Monitoring Tool

jstat [Option Vmid [Interval[s|ms] [count]]

JSTAT-GC 2764 250 20

Options in which option:-class-gc-gccapacity-gcutil ...

Jinfo Java Configuration Information tool

Jmap Java Intrinsic Mapping tool for generating heap dump snapshots can also be configured with-xx:+heapdumponoutofmemoryerror to allow the JVM to automatically generate dump files when Oom

jmap [option] Vmid

Jmap-dump:file=ss.bin 2260

The option options are:

-dump generating a heap-to-snapshot of Java-dump:[live,]format=b,file=<filename>

-HEAP Displays Java heap details, such as which collector, parameter configuration, generational status, and so on, only valid for Linux/solaris

-histo display of object statistics in the heap, including class, instance data, aggregate capacity

Jhat analyzing heap dump snapshots generated by jmap

Jstack Java Stack Trace tool

Jstack-f|-l|-m Vmid

Jconsle Visualization Tool

Deep understanding of Java Virtual Machines-fourth Chapter