Well, a good way to make your memory clean is to use strict, and declare every variable with my. Try to organize your code in subs too, since the variables used in each sub will be cleaned automatically by Perl. In orther words, try to not make global variables.

For who want something better, like clean every thing inside a package, including the memory used to declare subs, try to use this code, that I have adapted to make it independent for this node. The code comes from the module HPL::Safe. Where it runs a script inside a Safe compartment and clean all the memory after each run. Note that a package cleaned with this can't be reused, you will get some memory leaks!

#!/usr/bin/perl


clean_pack('main::FOO');

##############
# CLEAN_PACK #
##############

sub clean_pack {
  my ( $pack_name ) = @_ ;
  
  &undef_pack($pack_name,1) ; ## Clean fisrt variables to DETROY objec
+ts.

  my @packs = (scan_packs($pack_name) , $pack_name) ;

  foreach my $packname ( reverse sort @packs ) { &undef_pack($packname
+,\%NO_CLEAN) ;}
  
  return( 1 ) ;
}

##############
# UNDEF_PACK #
##############

sub undef_pack {
  my ( $packname , $keep_base) = @_ ;
  
  $packname .= '::' unless $packname =~ /::$/ ;
  no strict "refs" ;
  my $package = *{$packname}{HASH} ;
  return unless defined $package ;
  
  foreach my $symb ( keys %$package ) {
    if ( $symb !~ /::$/ && $symb !~ /^(?:\@|_|-|\d|\]|\^[VO]?)$/ ) {
      undef *{$packname . $symb} ;
    }
  }
  
  undef *{$packname} if !$keep_base ;
}

##############
# SCAN_PACKS #
##############

sub scan_packs {
  my ( $package ) = @_ ;

  my %packs = %{_symdump($package)} ;
  
  my @result ;
  my $prepend ;
  foreach my $pack (keys %packs){
    push @result, map {"$prepend$_"} keys %{$packs{$pack}{$part} || {}
+};
  }
    
  return(@result) ;
}

############
# _SYMDUMP #
############

sub _symdump {
  my(@packages) = @_ ;
  my($key,$val,$num,$pack,@todo,$tmp);
  my $result = {};
  foreach $pack (@packages){
    no strict;
    while (($key,$val) = each(%{*{"$pack\::"}})) {
      my $gotone = 0;
      local(*ENTRY) = $val;
      #### PACKAGE ####
      if (defined $val && defined *ENTRY{HASH} && $key =~ /::$/ &&
      $key ne "main::" && $key ne "<none>::") {
        my($p) = $pack ne "main" ? "$pack\::" : "";
        ($p .= $key) =~ s/::$//;
        $result->{$pack}{PACKAGES}{$p}++;
        $gotone++;
        push @todo, $p;
      }
    }
  }

  return (@todo) ? { %$result, %{_symdump(@todo)} } : $result ;
}

#######
# END #
#######
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Graciliano M. P.
"The creativity is the expression of the liberty".