Perl5 リファレンス

       dump LABEL

       dump    This function causes an immediate core dump.  See
               also the -u command-line switch in the perlrun
               manpage, which does the same thing.  Primarily
               this is so that you can use the undump program
               (not supplied) to turn your core dump into an
               executable binary after having initialized all
               your variables at the beginning of the program.
               When the new binary is executed it will begin by
               executing a `goto LABEL' (with all the
               restrictions that `goto' suffers).  Think of it as
               a goto with an intervening core dump and
               reincarnation.  If `LABEL' is omitted, restarts
               the program from the top.

               WARNING: Any files opened at the time of the dump
               will not be open any more when the program is
               reincarnated, with possible resulting confusion on
               the part of Perl.

               This function is now largely obsolete, partly
               because it's very hard to convert a core file into
               an executable, and because the real compiler
               backends for generating portable bytecode and
               compilable C code have superseded it.

               If you're looking to use the dump manpage to speed
               up your program, consider generating bytecode or
               native C code as described in the perlcc manpage.
               If you're just trying to accelerate a CGI script,
               consider using the `mod_perl' extension to Apache,
               or the CPAN module, Fast::CGI.  You might also
               consider autoloading or selfloading, which at
               least make your program appear to run faster.