IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > Using dump agents

Dump agents

A dump agent performs diagnostic tasks when triggered. Most dump agents save information on the state of the JVM for later analysis. The "tool" agent can be used to trigger interactive diagnostic data.

The following table shows the dump agents:

Dump agent	Description
stack	Stack dumps are very basic dumps in which the status and Java stack of the thread is written to stderr. See Stack dumps.
console	Basic thread dump to stderr.
system	Capture raw process image. See Using system dumps and the dump viewer.
tool	Run command-line program.
java	Write application summary. See Using Javadump.
heap	Capture heap graph. See Using Heapdump.
snap	Take a snap of the trace buffers.

• Console dumps
  Console dumps are very basic dumps, in which the status of every Java thread is written to stderr.
• System dumps
  System dumps involve dumping the address space and as such are generally very large.
• Stack dumps
  Stack dumps are very basic dumps in which the status and Java stack of the thread is written to stderr. Stack dumps are very useful when used together with the "allocation" dump event to identify Java code that is allocating large objects.
• Tool option
  The tool option allows external processes to be started when an event occurs.
• Javadumps
  Javadumps are an internally generated and formatted analysis of the JVM, giving information that includes the Java threads present, the classes loaded, and heap statistics.
• Heapdumps
  Heapdumps produce phd format files by default.
• Snap traces
  Snap traces are controlled by -Xdump. They contain the tracepoint data held in the trace buffers.

Parent: Using dump agents

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