Profile the internals of a Perl program.This module lets perl keep a count of each internal operation in a program so that you can profile your Perl code.

A data debugging tool for the XS programmer. Devel::Peek contains functions which allows raw Perl datatypes to be manipulated from a Perl script. This is used by those who do XS programming to check that the data they are sending from C to Perl looks as they think it should look. The trick, then, is to know what the raw datatype is supposed to look like when it gets to Perl.

This package processes Perl source files and outputs a modified version acording to several user-setable option flags.

Perl debugger using a Tk GUI.

ptkdb is a debugger for perl that uses perlTk for a user interface.

Perl extension querying sawampersand variable. There's a global variable in the perl source, called sawampersand. It gets set to true in that moment in which the parser sees one of $`, $', and $&. It never can be set to false again. Trying to set it to false breaks the handling of the $`, $&, and $' completely.

The Devel::SmallProf profiler is focused on the time taken for a program run on a line-by-line basis. It is intended to be as small'' in terms of impact on the speed and memory usage of the profiled program as possible and also in terms of being simple to use.

This little package serves to access the symbol table of perl.

Print out each line before it is executed (like sh -x)

A weak reference maintains a pointer'' to an object (specified by a reference to it, just like bless) that does not contribute to the object's reference count; thus, the object's storage will be freed when only weak references remain to it.