p4raw-id: //depot/perl@20755
meant as a guide to interfacing these tools with Perl, not
as any kind of guide to the use of the tools themselves.
+Note that running under memory debuggers such as Purify, valgrind,
+or Third Degree greatly slows down the execution: seconds become minutes,
+minutes become hours.
+
=head2 Rational Software's Purify
Purify is a commercial tool that is helpful in identifying