java -Xrunhprof:help
java -Xrunhprof:helpHPROF: Heap and CPU Profiling Agent (JVMTI Demonstration Code)
hprof usage: java -agentlib:hprof=|[<option>=<value>, ...]
Option Name and ValueDescription Default
-------------------------------- -------
heap=dump|sites|all heap profiling all
cpu=samples|times|oldCPU usage off
monitor=y|n monitor contention n
format=a|b text(txt) or binary output a
file=<file> write data to file java.hprof[{.txt}]
net=<host>:<port> send data over a socket off
depth=<size> stack trace depth 4
interval=<ms> sample interval in ms 10
cutoff=<value> output cutoff point 0.0001
lineno=y|n line number in traces? y
thread=y|n thread in traces? n
doe=y|n dump on exit? y
msa=y|n Solaris micro state accounting n
force=y|n force output to <file> y
verbose=y|n print messages about dumps y
Obsolete Options
----------------
gc_okay=y|n
Examples
--------
- Get sample cpu information every 20 millisec, with a stack depth of 3:
java -agentlib:hprof=cpu=samples,interval=20,depth=3 classname
- Get heap usage information based on the allocation sites:
java -agentlib:hprof=heap=sites classname
Notes
-----
- The option format=b cannot be used with monitor=y.
- The option format=b cannot be used with cpu=old|times.
- Use of the -Xrunhprof interface can still be used, e.g.
java -Xrunhprof:|[<option>=<value>, ...]
will behave exactly the same as:
java -agentlib:hprof=|[<option>=<value>, ...]
Warnings
--------
- This is demonstration code for the JVMTI interface and use of BCI,
it is not an official product or formal part of the JDK.
- The -Xrunhprof interface will be removed in a future release.
- The option format=b is considered experimental, this format may change
in a future release.
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