pl_flowinfo.d - snoop Perl subroutine flow with info using DTrace. pl_flowinfo.d This traces activity from all Perl programs on the system that are running with Perl provider support. Filename and subroutine names are printed if available. Any Evolving - uses the DTrace Perl provider, which may change as additional features are introduced. Check Perl/Readme to see what version these scripts are based on.

Default output, # pl_flowinfo.d

C CPU-id

PID Process ID

DELTA(us) Elapsed time from previous line to this line

FILE Filename of the Perl program

LINE Line number of filename

TYPE Type of call (sub)

SUB Perl subroutine

-> subroutine entry

<- subroutine return

Watch the first column carefully, it prints the CPU-id. If it changes, then it is very likely that the output has been shuffled.

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