generate-jvm-report(1) (Sun GlassFish Enterprise Server v3 Reference Manual)

Sun GlassFish Enterprise Server v3 Reference Manual

generate-jvm-report(1)

Name

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 Enterprise Server instance processes. This subcommand provides an alternative to sending Ctrl+Break or kill -3 signals to Enterprise 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^TM software with which Enterprise Server is being used.

If Enterprise Server is running in the Java Runtime Environment (JRE^TM) 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

Do not specify this option. This option is retained for compatibility with other releases. If you specify this option, a syntax error does not occur. Instead, the subcommand runs successfully and the option is silently ignored.

--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^TM machine). [The terms "Java Virtual Machine" and "JVM" mean a Virtual Machine for the Java platform.]

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