in reply to Re^3: Managing the fork/execing and reaping of child processes
in thread Managing the fork/execing and reaping of child processes

"Tracing" could be something as simple as sprinkling 
print STDERR "This is line ", __LINE__, "\n"

[download]

most everywhere, to using the debugger with actions on interesting lines, to one of the modules that wraps around the bytecode.

-QM
--
Quantum Mechanics: The dreams stuff is made of

In Section Seekers of Perl Wisdom