j_calls.d - count Java calls (method/...) using DTrace. j_calls.d 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 TYPEs: cload class load method method call mcompile method compile mload compiled method load oalloc object alloc thread thread start 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_calls.d

PID Process ID

TYPE Type of call (see below)

NAME Name of call

COUNT Number of calls during sample

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