NAME

j_stat.d - Java operation stats using DTrace.

SYNOPSIS

j_stat.d [interval [count]]

DESCRIPTION

This traces activity from all Java processes on the system with hotspot provider support (1.6.0). Method calls and object allocation are only visible when using the flag "+ExtendedDTraceProbes". eg, java -XX:+ExtendedDTraceProbes classfile

The numbers are counts for the interval specified. The default interval is 1 second.

If you see a count in "EXECS" but not in the other columns, then your Java software is probably not running with the DTrace hotspot provider.

If you see counts in "CLOAD" but not in "METHODS", then you Java software probably isn't running with "+ExtendedDTraceProbes".

OS

Solaris

STABILITY

Evolving - uses the DTrace hotspot provider, which may change as additional features are introduced. Check Java/Readme to see what version these scripts are based on.

EXAMPLES

Default output,: # j_stat.d

FIELDS

EXEC/s: Java programs executed per second, including those without Java provider support
METHOD/s: Methods called, per second
OBJNEW/s: Objects created, per second
CLOAD/s: Class loads, per second
EXCP/s: Exceptions raised, per second
RESC/s: Rescues, per second
GC/s: Garbage collects, per second

DOCUMENTATION

See the DTraceToolkit for further documentation under the Examples, Notes and Docs directories. The example files may be especially useful as they aim to demonstrate how to interpret the output.

EXIT

j_stat.d will run until Ctrl-C is hit.

AUTHOR

Brendan Gregg [CA, USA]