=head1 NAME
-perlfaq3 - Programming Tools ($Revision: 1.31 $, $Date: 2003/01/03 20:10:11 $)
+perlfaq3 - Programming Tools ($Revision: 1.33 $, $Date: 2003/01/31 17:34:56 $)
=head1 DESCRIPTION
=head2 Is there a Perl shell?
-In general, not yet. There is psh available at
-
- http://www.focusresearch.com/gregor/psh
-
-Which includes the following description:
-
- The Perl Shell is a shell that combines the interactive nature
- of a Unix shell with the power of Perl. The goal is to eventually
- have a full featured shell that behaves as expected for normal
- shell activity. But, the Perl Shell will use Perl syntax and
- functionality for control-flow statements and other things.
+The psh (Perl sh) is currently at version 1.8. The Perl Shell is a
+shell that combines the interactive nature of a Unix shell with the
+power of Perl. The goal is a full featured shell that behaves as
+expected for normal shell activity and uses Perl syntax and
+functionality for control-flow statements and other things.
+You can get psh at http://www.focusresearch.com/gregor/psh/ .
The Shell.pm module (distributed with Perl) makes Perl try commands
which aren't part of the Perl language as shell commands. perlsh
The best way to do this is to come up with a better algorithm. This
can often make a dramatic difference. Jon Bentley's book
-``Programming Pearls'' (that's not a misspelling!) has some good tips
+I<Programming Pearls> (that's not a misspelling!) has some good tips
on optimization, too. Advice on benchmarking boils down to: benchmark
and profile to make sure you're optimizing the right part, look for
better algorithms instead of microtuning your code, and when all else
fails consider just buying faster hardware. You will probably want to
-read the answer to the earlier question ``How do I profile my Perl programs?''
-if you haven't done so already.
+read the answer to the earlier question ``How do I profile my Perl
+programs?'' if you haven't done so already.
A different approach is to autoload seldom-used Perl code. See the
AutoSplit and AutoLoader modules in the standard distribution for
that. Or you could locate the bottleneck and think about writing just
that part in C, the way we used to take bottlenecks in C code and
-write them in assembler. Similar to rewriting in C,
-modules that have critical sections can be written in C (for instance, the
-PDL module from CPAN).
-
-In some cases, it may be worth it to use the backend compiler to
-produce byte code (saving compilation time) or compile into C, which
-will certainly save compilation time and sometimes a small amount (but
-not much) execution time. See the question about compiling your Perl
-programs for more on the compiler--the wins aren't as obvious as you'd
-hope.
-
-If you're currently linking your perl executable to a shared I<libc.so>,
-you can often gain a 10-25% performance benefit by rebuilding it to
-link with a static libc.a instead. This will make a bigger perl
-executable, but your Perl programs (and programmers) may thank you for
-it. See the F<INSTALL> file in the source distribution for more
-information.
-
-Unsubstantiated reports allege that Perl interpreters that use sfio
-outperform those that don't (for I/O intensive applications). To try
-this, see the F<INSTALL> file in the source distribution, especially
-the ``Selecting File I/O mechanisms'' section.
-
-The undump program was an old attempt to speed up your Perl program
-by storing the already-compiled form to disk. This is no longer
-a viable option, as it only worked on a few architectures, and
-wasn't a good solution anyway.
+write them in assembler. Similar to rewriting in C, modules that have
+critical sections can be written in C (for instance, the PDL module
+from CPAN).
+
+If you're currently linking your perl executable to a shared
+I<libc.so>, you can often gain a 10-25% performance benefit by
+rebuilding it to link with a static libc.a instead. This will make a
+bigger perl executable, but your Perl programs (and programmers) may
+thank you for it. See the F<INSTALL> file in the source distribution
+for more information.
+
+The undump program was an ancient attempt to speed up Perl program by
+storing the already-compiled form to disk. This is no longer a viable
+option, as it only worked on a few architectures, and wasn't a good
+solution anyway.
=head2 How can I make my Perl program take less memory?
as the first line in C<*.cmd> file (C<-S> due to a bug in cmd.exe's
`extproc' handling). For DOS one should first invent a corresponding
-batch file and codify it in C<ALTERNATIVE_SHEBANG> (see the
-F<INSTALL> file in the source distribution for more information).
+batch file and codify it in C<ALTERNATE_SHEBANG> (see the
+F<dosish.h> file in the source distribution for more information).
The Win95/NT installation, when using the ActiveState port of Perl,
will modify the Registry to associate the C<.pl> extension with the
projects / p5sagit/p5-mst-13.2.git / blobdiff