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

priority option

One event can generate multiple dumps. The agents that produce each dump run sequentially and their order is determined by the priority keyword set for each agent.

Examination of the output from -Xdump:what shows that a gpf event produces a snap trace, a Javadump, and a system dump. In this example, the system dump runs first, with priority 999. The snap dump runs second, with priority 500. The Javadump runs last, with priority 10:

–Xdump:heap:events=vmstop,priority=123

The maximum value allowed for priority is 999. Higher priority dump agents are started first.

If you do not specifically set a priority, default values are taken based on the dump type. The default priority and the other default values for a particular type of dump, can be displayed by using -Xdump:<type>:defaults. For example:

java -Xdump:heap:defaults -version

Default -Xdump:heap settings:

  events=gpf+user
  filter=
  file=/home/user/heapdump.%Y%m%d.%H%M%S.%pid.phd
  range=1..0
  priority=40
  request=exclusive+prepwalk
  opts=PHD

Parent: Advanced control of dump agents

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