j_who.d - trace Java calls by process using DTrace. j_who.d This traces activity from all Java processes on the system with hotspot provider support (1.6.0). The argument list is truncated at 55 characters (up to 80 is easily available). To easily read the full argument list, use other system tools; on Solaris use "pargs PID". 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_who.d

PID Process ID of Java

UID User ID of the owner

CALLS Number of calls made (a measure of activity)

ARGS Process name and arguments

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