WAS v8.5 > Script the application serving environment (wsadmin) > Troubleshooting with scriptingDumping threads in server processes using scripting
Use the AdminControl object to produce a Java core dump, which includes the Java threads of a running server.
Before starting this task, wsadmin must be running. See the Start the wsadmin scripting client using wsadmin.sh article for more information.
- A Java heap dump includes all of the live objects on the Java heap that are being used by the running Java application.
- A system TDUMP includes the content of all of the failing address spaces.
In some circumstances, the hung thread detection process might be frequently triggered, causing system TDUMPs to be initiated. These dumps can be large and take several minutes to process. While the dumps are being processed, the server address space is not dispatchable, which might extend the length of time locks owned by the address space are held. If your server uses shared sub-systems like DB2 or WebSphere MQ, the extended length of time during which the locks might be held could adversely effect those shared sub-systems, and other address spaces that share those sub-systems. If you experience frequent hung threads, you might want to disable the taking of system TDUMPs on the application server experiencing the hung threads.
- A Java core dump includes all of the memory that is being used by the JVM, and includes the state of every thread in the server processes.
Issue one of the following commands to produce a Java core dump.
Jacl:
set jvm [$AdminControl completeObjectName type=JVM,process=server1,*] $AdminControl invoke $jvm dumpThreadsJython:
jvm = AdminControl.completeObjectName('type=JVM,process=server1,*') AdminControl.invoke(jvm, 'dumpThreads')
The dumpThreads command creates other types of dump files depending on the -Xdumps settings. Dump output varies depending on the platform and might include system core files, heap, and snap dumps.
Related
Use the wsadmin scripting AdminControl object for scripted administration
Reference:
Commands for the AdminControl object using wsadmin.sh