145/461

## generate-jvm-report

shows the JVM machine statistics for a given target instance

Synopsis

    generate-jvm-report [--help] [--type=jvm-statistic-type] [--target target]

Description

The `generate-jvm-report` subcommand creates a report that shows the threads (dump of stack trace), classes, memory, or loggers for a given target instance, including the domain administration server (DAS). If a type is not specified, a summary report is generated. This subcommand only provides statistics for the GlassFish Server instance processes. This subcommand provides an alternative to sending Ctrl+Break or `kill -3` signals to GlassFish Server processes to obtain a stack trace for processes that are hanging.

The information in the report is obtained from managed beans (MBeans) and MXBeans that are provided in the Java Platform, Standard Edition (Java SE ) or JDK software with which GlassFish Server is being used.

If GlassFish Server is running in the Java Runtime Environment (JRE) software from JDK release 6 or Java SE 6, additional information is provided. For example:

- System load on the available processors

- Object monitors that are currently held or requested by a thread

- Lock objects that a thread is holding, for example, `ReentrantLock` objects and `ReentrantReadWriteLock` objects

If the JRE software cannot provide this information, the report contains the text `NOT_AVAILABLE`.

This subcommand is supported in remote mode only.

Options

`--help`
`-?`

  Displays the help text for the subcommand.

`--target`

  Specifies the target for which you are showing JVM machine statistics.

  Valid values are as follows:

  `server`

    Specifies the DAS (default).

  instance-name

    Specifies a GlassFish Server instance.

  cluster-name

    Specifies a cluster.

  configuration-name

    Specifies a named configuration.

`--type`

  The type of report that is to be generated. Default is `summary`.

  `summary`

    Displays summary information about the threads, classes, and memory (default).

  `memory`

    Provides information about heap and non-heap memory consumption, memory pools, and garbage collection statistics for a given target instance.

  `class`

    Provides information about the class loader for a given target instance.

  `thread`

    Provides information about threads running and the thread dump (stack trace) for a given target instance.

  `log`

    Provides information about the loggers that are registered in the Virtual Machine for the Java platform (Java Virtual Machine or JVM machine).Foot 1

Examples

Example 1 Obtaining Summary Information for the JVM Machine

  This example shows a partial listing of a report that is generated if no type is specified. This same report is generated if the `summary` type is specified.

      asadmin> generate-jvm-report
      Operating System Information:
      Name of the Operating System: SunOS
      Binary Architecture name of the Operating System: sparc, Version: 5.10
      Number of processors available on the Operating System: 32
      System load on the available processors for the last minute: 7.921875.
      (Sum of running and queued runnable entities per minute)
      General Java Runtime Environment Information for the VM: 64097@sr1-usca-22
      ...
      sun.desktop = gnome
      sun.io.unicode.encoding = UnicodeBig
      sun.java.launcher = SUN_STANDARD
      sun.jnu.encoding = ISO646-US
      sun.management.compiler = HotSpot Client Compiler
      sun.os.patch.level = unknown
      user.dir = /home/thisuser/GlassFish/glassfishv3/glassfish/domains/mydomain4/config
      user.home = /home/thisuser
      user.language = en
      user.name = thisuser
      user.timezone = US/Pacific
      Command generate-jvm-report executed successfully

Example 2 Obtaining Information for a Particular JVM Machine Type

  This example generates a report that shows information on the class loader.

      asadmin> generate-jvm-report --type=class
      Class loading and unloading in the Java Virtual Machine:
      Number of classes currently loaded in the Java Virtual Machine: 3,781
      Number of classes loaded in the Java Virtual Machine since the startup: 3,868
      Number of classes unloaded from the Java Virtual Machine: 87
      Just-in-time (JIT) compilation information in the Java Virtual Machine:
      Java Virtual Machine compilation monitoring allowed: true
      Name of the Just-in-time (JIT) compiler: HotSpot Client Compiler
      Total time spent in compilation: 0 Hours 0 Minutes 4 Seconds
      Command generate-jvm-report executed successfully.

Exit Status

0

  subcommand executed successfully

1

  error in executing the subcommand

See Also

create-jvm-options(1), delete-jvm-options(1), list-jvm-options(1)

asadmin(1M)

Footnote Legend

Footnote 1: The terms "Java Virtual Machine" and "JVM" mean a Virtual Machine for the Java platform.