Table of Contents
1. Each globals.hpp file in HotSpot vm View the initial default value and parameters of jvm
2.-XX:+PrintFlagsInitialParameters " >2.-XX:+PrintFlagsInitialParameters
Home Java javaTutorial Java virtual machine learning - command line tool to view JVM parameters and values

Java virtual machine learning - command line tool to view JVM parameters and values

Feb 17, 2017 am 10:36 AM

How to view each parameter value of JVM

1. Each globals.hpp file in HotSpot vm View the initial default value and parameters of jvm

globals.hpp

globals_extension.hpp

c1_globals.hpp

c1_globals_linux.hpp

c1_globals_solaris.hpp

c1_globals_sparc.hpp

c1_globals_windows.hpp

c1_globals_x86. hpp

c2_globals.hpp

##c2_globals_linux.hpp

c2_globals_solaris.hpp

c2_globals_sparc.hpp

##c2_globals_windows.hpp

##c2_globals_x86.hpp

g1_globals.hpp

globals_linux.hpp

globals_linux_sparc.hpp

globals_linux_x86. hpp

globals_linux_zero.hpp

globals_solaris.hpp

globals_solaris_sparc.hpp

globals_solaris_x86.hpp

globals_sparc.hpp

##globals_windows.hpp

globals_windows_x86.hpp

globals_x86.hpp

globals_zero.hpp

shark_globals. hpp

shark_globals_zero.hpp

arguments.cpp

2.-XX:+PrintFlagsInitialParameters

Display all settable parameters and default values. You can combined -XX:+PrintFlagsInitial and -XX:+PrintFlagsFinal to compare the differences before and after setting, so that you can know which parameters have been adjusted.

#3.-XX: +PrintFlagsFinal parameter

can obtain all settable parameters and values ​​​​(values ​​after manual setting). This parameter can only be used in Jdk6 update 21 or above (including this version ). The usage of the -XX:+PrintFlagsFinal parameter is the same as the above -XX:+PrintFlagsInitial parameter java -XX:+PrintFlagsFinal

4. Use the jinfo command to view or set the value of a parameter,

##jinfo command format:

jinfo [option]

pid virtual machine process id can be viewed through the jps command

Example: Query the value of the MaxPermSize parameter


##Or directly use jinfo -flags pid to view all setting parameters of the vm

5. -XX:+PrintCommandLineFlags parameter

Displays all parameters and their values ​​that are different from the initial default values ​​after the JVM is initialized.

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