JDK诊断工具——jinfo_jinfo usage:jinfo-优快云博客

本文介绍了如何通过命令行工具jinfo和jhsdbjinfo来查看Java进程的JVM配置和系统属性。jinfo提供查看、启用或禁用JVM标志的功能，而jhsdbjinfo则可以用于查看核心文件或远程调试服务器的详细信息。通过这两个命令，开发者可以深入理解Java进程的运行状态和调整JVM参数。

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jinfo 命令为指定的 Java 进程生成 Java的扩展配置信息。此命令是实验性的，不受支持。对于核心文件，请使用 jhsdb jinfo。

jps -v也可以查看，但是是查看当前机器所有的进程的JVM配置。

先打开命令行cmd或powershell或者哪个都可以，其实IDEA也可以打开Terminal

IDEA打开Terminal

输入命令jinfo，如果不可用的话试试jhsdb jinfo，查看可用参数及介绍。这两个的内容差不多。我们按jinfo介绍。

(base) PS G:\Project\highway-resources> jinfo
Usage:
    jinfo <option> <pid>
       (to connect to a running process)

where <option> is one of:
    -flag <name>         to print the value of the named VM flag
    -flag [+|-]<name>    to enable or disable the named VM flag
    -flag <name>=<value> to set the named VM flag to the given value
    -flags               to print VM flags
    -sysprops            to print Java system properties
    <no option>          to print both VM flags and system properties
    -? | -h | --help | -help to print this help message

(base) PS G:\Project\highway-resources> jhsdb jinfo
    --flags                 To print VM flags.
    --sysprops              To print Java System properties.
    <no option>             To print both of the above.
    --pid <pid>             To attach to and operate on the given live process.
    --core <corefile>       To operate on the given core file.
    --exe <executable for corefile>
    --connect [<serverid>@]<host>[:registryport][/servername] To connect to a remote debug server (debugd).

    The --core and --exe options must be set together to give the core
    file, and associated executable, to operate on. They can use
    absolute or relative paths.
    The --pid option can be set to operate on a live process.
    The --connect option can be set to connect to a debug server (debugd).
    --core, --pid, and --connect are mutually exclusive.

    Examples: jhsdb jinfo --pid 1234
          or  jhsdb jinfo --core ./core.1234 --exe ./myexe
          or  jhsdb jinfo --connect serverid@debugserver:1234/servername

jinfo的命令行格式为：jinfo <option> <pid>，pid可以通过jps命令查看。option选择在下面表格

选项（option）	简述
-flag name	查看指定参数名称和值
-flag [+\|-]name	启用或禁用指定的布尔命令
-flag name=value	给指定的参数设置值
-flags	打印JVM的配置

jps -flags <pid>

查看JVM的配置，这个看的比较全，比较常用

(base) PS G:\Project\highway-resources> jinfo -flags 11096
VM Flags:
-XX:CICompilerCount=4 -XX:ConcGCThreads=2 -XX:G1ConcRefinementThreads=8 -XX:G1EagerReclaimRemSetThreshold=16 
-XX:G1HeapRegionSize=2097152 -XX:GCDrainStackTargetSize=64 -XX:InitialHeapSize=268435456 -XX:MarkStackSize=4194304 
-XX:MaxHeapSize=4271898624 -XX:MaxNewSize=2562719744 -XX:MinHeapDeltaBytes=2097152 -XX:MinHeapSize=8388608 
-XX:NonNMethodCodeHeapSize=5839372 -XX:NonProfiledCodeHeapSize=122909434 -XX:ProfiledCodeHeapSize=122909434 
-XX:ReservedCodeCacheSize=251658240 -XX:+SegmentedCodeCache -XX:SoftMaxHeapSize=4271898624 
-XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseFastUnorderedTimeStamps 
-XX:+UseG1GC -XX:-UseLargePagesIndividualAllocation

jhsdb jinfo --flags --pid <pid>

jhsdb jinfo查看JVM的参数。

(base) PS G:\Project\highway-resources> jhsdb jinfo --flags --pid 11096
Attaching to process ID 11096, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 17+35-LTS-2724
Non-default VM flags: -XX:CICompilerCount=4 -XX:ConcGCThreads=2 -XX:G1ConcRefinementThreads=8 
-XX:G1EagerReclaimRemSetThreshold=16 -XX:G1HeapRegionSize=2097152 -XX:GCDrainStackTargetSize=64 
-XX:InitialHeapSize=268435456 -XX:MarkStackSize=4194304 -XX:MaxHeapSize=4271898624 -XX:MaxNewSize=2562719744 
-XX:MinHeapDeltaBytes=2097152 -XX:MinHeapSize=8388608 -XX:NonNMethodCodeHeapSize=5839372 
-XX:NonProfiledCodeHeapSize=122909434 -XX:ProfiledCodeHeapSize=122909434 -XX:ReservedCodeCacheSize=251658240
-XX:+SegmentedCodeCache -XX:SoftMaxHeapSize=4271898624 -XX:+UseCompressedClassPointers -XX:+UseCompressedOops 
-XX:+UseFastUnorderedTimeStamps -XX:+UseG1GC -XX:-UseLargePagesIndividualAllocation