java -Xdump:help

Usage:

-Xdump:help Print general dump help
-Xdump:none Ignore all previous/default dump options
-Xdump:events List available trigger events
-Xdump:request List additional VM requests
-Xdump:tokens List recognized label tokens
-Xdump:dynamic Enable support for pluggable agents
-Xdump:what Show registered agents on startup

-Xdump::help Print detailed dump help
-Xdump::none Ignore previous dump options of this type
-Xdump::defaults Print/update default settings for this type
-Xdump: Request this type of dump (using defaults)

Dump types:

-Xdump:console Basic thread dump to stderr
-Xdump:system Capture raw process image
-Xdump:tool Run command line program
-Xdump:java Write application summary
-Xdump:heap Capture raw heap image
-Xdump:snap Take a snap of the trace buffers

Example:

java -Xdump:heap:none -Xdump:heap:events=fullgc class [args...]

Turns off default heapdumps, then requests a heapdump on every full GC.


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java -Xdump:java:help

Write application summary:

-Xdump:java[:defaults][:=, ...]

Dump options:

events= Trigger dump on named events
[+...] (see -Xdump:events)

filter=[*][*] Filter on class (for load,throw,catch,uncaught)
#.. Filter on exit code (for vmstop)

file= Output file
range=.. Limit dumps
priority= Highest first
request= Request additional VM actions
[+...] (see -Xdump:request)

opts=

Default -Xdump:java settings:

events=gpf+user
filter=
file=/home/alfred/javacore.%Y%m%d.%H%M%S.%pid.%seq.txt
range=1..0
priority=10
request=exclusive
opts=

*range means count, 1..0 : every occurence of event, 1..4: first four events (4 writes only)

*Tip: Deleting dump agents and create a new dump configuration can require a long set of command-line options. To reuse command-line options, save the new dump configuration in a file and use the -Xoptionsfile option. See http://publib.boulder.ibm.com/infocenter/javasdk/v6r0/topic/com.ibm.java.doc.diagnostics.60/diag/appendixes/cmdline/cmdline_specifying.html for more information on using a command-line options file.