j_calltime.d - measure Java elapsed times for different types of operation. j_calltime.d [top] This traces activity from all Java processes on the system with hotspot provider support (1.6.0). Method calls are only visible when using the flag "+ExtendedDTraceProbes". eg, java -XX:+ExtendedDTraceProbes classfile The "top" optional argument will truncate the output for each report section to that many lines, with a default of 10. Solaris 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.

Default output, # j_calltime.d

PID Process ID

TYPE Type of call (method/gc/total)

NAME Name of call

TOTAL Total elapsed time for calls (us)

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. j_calltime.d will run until Ctrl-C is hit. Brendan Gregg [CA, USA] dtrace(1M)