Java 虚拟机学习（8）：查看 JVM 参数及值的命令行工具
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来源：java2000_wl，
blog.csdn.net/java2000_wl/article/details/8042010
查看JVM各个参数值方式
1. HotSpot vm中的各个globals.hpp文件 查看jvm初始的默认值及参数
globals.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/share/vm/runtime/globals.hpp
globals_extension.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/share/vm/runtime/globals_extension.hpp
c1_globals.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/share/vm/c1/c1_globals.hpp
c1_globals_linux.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os/linux/vm/c1_globals_linux.hpp
c1_globals_solaris.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os/solaris/vm/c1_globals_solaris.hpp
c1_globals_sparc.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/cpu/sparc/vm/c1_globals_sparc.hpp
c1_globals_windows.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os/windows/vm/c1_globals_windows.hpp
c1_globals_x86.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/cpu/x86/vm/c1_globals_x86.hpp
c2_globals.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/share/vm/opto/c2_globals.hpp
c2_globals_linux.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os/linux/vm/globals_linux.hpp
c2_globals_solaris.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os/solaris/vm/c2_globals_solaris.hpp
c2_globals_sparc.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/cpu/sparc/vm/c2_globals_sparc.hpp
c2_globals_windows.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os/windows/vm/c2_globals_windows.hpp
c2_globals_x86.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/cpu/x86/vm/c2_globals_x86.hpp
g1_globals.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/share/vm/gc_implementation/g1/g1_globals.hpp
globals_linux.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os/linux/vm/globals_linux.hpp
globals_linux_sparc.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os_cpu/linux_sparc/vm/globals_linux_sparc.hpp
globals_linux_x86.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os_cpu/linux_x86/vm/globals_linux_x86.hpp
globals_linux_zero.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os_cpu/linux_zero/vm/globals_linux_zero.hpp
globals_solaris.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os_cpu/solaris_sparc/vm/globals_solaris_sparc.hpp
globals_solaris_sparc.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os_cpu/solaris_sparc/vm/globals_solaris_sparc.hpp
globals_solaris_x86.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os_cpu/solaris_x86/vm/globals_solaris_x86.hpp
globals_sparc.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/cpu/sparc/vm/globals_sparc.hpp
globals_windows.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os/windows/vm/globals_windows.hpp
globals_windows_x86.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/os_cpu/windows_x86/vm/globals_windows_x86.hpp
globals_x86.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/cpu/x86/vm/globals_x86.hpp
globals_zero.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/cpu/zero/vm/globals_zero.hpp
shark_globals.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/share/vm/shark/shark_globals.hpp
shark_globals_zero.hpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/cpu/zero/vm/shark_globals_zero.hpp
arguments.cpp
http://hg.openjdk.java.net/hsx/hsx20/master/file/f0f676c5a2c6/src/share/vm/runtime/arguments.cpp
2.-XX:+PrintFlagsInitial参数
显示所有可设置参数及默认值，可结合-XX:+PrintFlagsInitial与-XX:+PrintFlagsFinal对比设置前、设置后的差异，方便知道对那些参数做了调整。
3.-XX:+PrintFlagsFinal参数
可以获取到所有可设置参数及值(手动设置之后的值)，这个参数只能使用在Jdk6 update 21以上版本(包括该版本)。-XX:+PrintFlagsFinal参数的使用 与上面-XX:+PrintFlagsInitial 参数使用相同 Java -XX:+PrintFlagsFinal
4.使用 jinfo 命令 查看或设置某个参数的值,
jinfo命令格式：
jinfo [option] <pid>
pid虚拟机进程id 可以通过 jps命令查看
例子：查询MaxPermSize 参数的值
或直接使用 jinfo -flags pid 查看vm的所有设置参数
5. -XX:+PrintCommandLineFlags参数
显示出JVM初始化完毕后所有跟最初的默认值不同的参数及它们的值。
本系列：
Java虚拟机学习（8）：查看JVM参数及值的命令行工具
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