Dump events

Dump agents are triggered by events occurring during JVM operation.

Some events can be filtered to improve the relevance of the output. See filter option for more information.

Note: The unload and expand events currently do not occur in WebSphere® Real Time. Classes are in immortal memory and cannot be unloaded.
Note: The gpf and abort events cannot trigger a heap dump, prepare the heap (request=prepwalk), or compact the heap (request=compact).

The table below shows events available as dump agent triggers:

Event Triggered when... Filter operation
gpf A General Protection Fault (GPF) occurs.  
user The JVM receives the SIGQUIT (Linux®) signal from the operating system.  
abort The JVM receives the SIGABRT signal from the operating system.  
vmstart The virtual machine is started.  
vmstop The virtual machine stops. Filters on exit code; for example, filter=#129..#192#-42#255
load A class is loaded. Filters on class name; for example, filter=java/lang/String
unload A class is unloaded.  
throw An exception is thrown. Filters on exception class name; for example, filter=java/lang/OutOfMem*
catch An exception is caught. Filters on exception class name; for example, filter=*Memory*
uncaught A Java™ exception is not caught by the application. Filters on exception class name; for example, filter=*MemoryError
systhrow A Java exception is about to be thrown by the JVM. This is different from the 'throw' event because it is only triggered for error conditions detected internally in the JVM. Filters on exception class name; for example, filter=java/lang/OutOfMem*
thrstart A new thread is started.  
blocked A thread becomes blocked.  
thrstop A thread stops.  
fullgc A garbage collection cycle is started.  
slow A thread takes longer than 5ms to respond to an internal JVM request.

Changes the time taken for an event to be considered slow; for example, filter=#300ms will trigger when a thread takes longer than 300ms to respond to an internal JVM request.



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