=head1 NAME
-perlfaq3 - Programming Tools ($Revision: 1.15 $, $Date: 2002/02/11 19:29:52 $)
+perlfaq3 - Programming Tools ($Revision: 1.22 $, $Date: 2002/05/06 13:11:13 $)
=head1 DESCRIPTION
as it were. A more complete example, with comments, can be found at
http://www.cpan.org/authors/id/TOMC/scripts/toms.exrc.gz
-The a2ps http://www-inf.enst.fr/%7Edemaille/a2ps/black+white.ps.gz does
+The a2ps http://www-inf.enst.fr/%7Edemaille/a2ps/black+white.ps does
lots of things related to generating nicely printed output of
-documents, as does enscript at http://people.ssh.fi/mtr/genscript/
+documents, as does enscript at http://people.ssh.fi/mtr/genscript/ .
=head2 Is there a ctags for Perl?
ActiveState's cross-platform (as of April 2001 Windows and Linux),
multi-language IDE has Perl support, including a regular expression
debugger and remote debugging
-(http://www.ActiveState.com/Products/Komodo/index.html). (Visual
+( http://www.ActiveState.com/Products/Komodo/index.html ). (Visual
Perl, a Visual Studio.NET plug-in is currently (early 2001) in beta
( http://www.ActiveState.com/Products/VisualPerl/index.html )).
=item The Object System
-(http://www.castlelink.co.uk/object_system/) is a Perl web
+( http://www.castlelink.co.uk/object_system/ ) is a Perl web
applications development IDE, apparently for any platform
that runs Perl.
=item PerlBuilder
-(http://www.solutionsoft.com/perl.htm) is an integrated development
+( http://www.solutionsoft.com/perl.htm ) is an integrated development
environment for Windows that supports Perl development.
=item visiPerl+
( http://helpconsulting.net/visiperl/ )
From Help Consulting, for Windows.
+=item OptiPerl
+
+( http://www.optiperl.com/ ) is a Windows IDE with simulated CGI
+environment, including debugger and syntax highlighting editor.
+
=back
For Windows there's also the
information, although some allow you to save files as "Text
Only". You can also download text editors designed
specifically for programming, such as Textpad
-(http://www.textpad.com/) and UltraEdit
-(http://www.ultraedit.com), among others.
+( http://www.textpad.com/ ) and UltraEdit
+( http://www.ultraedit.com/ ), among others.
-If you are using MacOS, the same concerns apply. MacPerl
+If you are using Mac OS, the same concerns apply. MacPerl
(for Classic environments) comes with a simple editor.
Popular external editors are BBEdit ( http://www.bbedit.com/ )
-or Alpha ( http://alpha.olm.net/ ). MacOS X users can use Unix
-editors as well.
+or Alpha ( http://www.kelehers.org/alpha/ ). Mac OS X users can
+use Unix editors as well.
=over 4
=back
For vi lovers in general, Windows or elsewhere:
-http://www.thomer.com/thomer/vi/vi.html
-nvi (http://www.bostic.com/vi/, available from CPAN in src/misc/) is
+ http://www.thomer.com/thomer/vi/vi.html
+
+nvi ( http://www.bostic.com/vi/ , available from CPAN in src/misc/) is
yet another vi clone, unfortunately not available for Windows, but in
UNIX platforms you might be interested in trying it out, firstly because
strictly speaking it is not a vi clone, it is the real vi, or the new
There is also a toyedit Text widget based editor written in Perl
that is distributed with the Tk module on CPAN. The ptkdb
-(http://world.std.com/~aep/ptkdb/) is a Perl/tk based debugger that
+( http://world.std.com/~aep/ptkdb/ ) is a Perl/tk based debugger that
acts as a development environment of sorts. Perl Composer
-(http://perlcomposer.sourceforge.net/vperl.html) is an IDE for Perl/Tk
+( http://perlcomposer.sourceforge.net/vperl.html ) is an IDE for Perl/Tk
GUI creation.
In addition to an editor/IDE you might be interested in a more
=item Ksh
-from the MKS Toolkit (http://www.mks.com/), or the Bourne shell of
+from the MKS Toolkit ( http://www.mks.com/ ), or the Bourne shell of
the U/WIN environment ( http://www.research.att.com/sw/tools/uwin/ )
=item Tcsh
-ftp://ftp.astron.com/pub/tcsh/, see also
+ftp://ftp.astron.com/pub/tcsh/ , see also
http://www.primate.wisc.edu/software/csh-tcsh-book/
=item Zsh
-ftp://ftp.blarg.net/users/amol/zsh/, see also http://www.zsh.org/
+ftp://ftp.blarg.net/users/amol/zsh/ , see also http://www.zsh.org/
=back
see http://www.cpan.org/authors/Tom_Christiansen/scripts/toms.exrc.gz ,
the standard benchmark file for vi emulators. The file runs best with nvi,
the current version of vi out of Berkeley, which incidentally can be built
-with an embedded Perl interpreter--see http://www.cpan.org/src/misc/
+with an embedded Perl interpreter--see http://www.cpan.org/src/misc/ .
=head2 Where can I get perl-mode for emacs?
For "big" data stores (i.e. ones that exceed available memory) consider
using one of the DB modules to store it on disk instead of in RAM. This
-will incur a penalty in access time, but that's probably better that
+will incur a penalty in access time, but that's probably better than
causing your hard disk to thrash due to massive swapping.
=back
=head2 How can I free an array or hash so my program shrinks?
-You can't. On most operating systems, memory allocated to a program
-can never be returned to the system. That's why long-running programs
-sometimes re-exec themselves. Some operating systems (notably,
-FreeBSD and Linux) allegedly reclaim large chunks of memory that is no
-longer used, but it doesn't appear to happen with Perl (yet). The Mac
-appears to be the only platform that will reliably (albeit, slowly)
-return memory to the OS.
-
-We've had reports that on Linux (Redhat 5.1) on Intel, C<undef
-$scalar> will return memory to the system, while on Solaris 2.6 it
-won't. In general, try it yourself and see.
+You usually can't. On most operating systems, memory
+allocated to a program can never be returned to the system.
+That's why long-running programs sometimes re-exec
+themselves. Some operating systems (notably, systems that
+use mmap(2) for allocating large chunks of memory) can
+reclaim memory that is no longer used, but on such systems,
+perl must be configured and compiled to use the OS's malloc,
+not perl's.
However, judicious use of my() on your variables will help make sure
that they go out of scope so that Perl can free up that space for
There are two popular ways to avoid this overhead. One solution
involves running the Apache HTTP server (available from
-http://www.apache.org/) with either of the mod_perl or mod_fastcgi
+http://www.apache.org/ ) with either of the mod_perl or mod_fastcgi
plugin modules.
With mod_perl and the Apache::Registry module (distributed with
http://perl.apache.org/
With the FCGI module (from CPAN) and the mod_fastcgi
-module (available from http://www.fastcgi.com/) each of your Perl
+module (available from http://www.fastcgi.com/ ) each of your Perl
programs becomes a permanent CGI daemon process.
Both of these solutions can have far-reaching effects on your system
https://perl5.git.perl.org / perl5.git / blobdiff