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Any performance issue if too many module is use

Posted on 2002-04-07
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Last Modified: 2010-03-05
I have a standard config file that is use in most of my cgi script. In the configuration I have add a list of module. However not all my cgi script are using all the module declare in the config file.

I would like to know if I add more module as time goes by, will those cgi script that use only one or 2 of the module get slow down by loading that many module through the config file?

Below is sample config file and a sample cgi script that I used.

Sample cgi script (test.cgi)
#!/usr/bin/perl
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);
use CGI qw(:standard);
warningsToBrowser(1);
require 'config.pl';

print header;
print "Testing only";
print end_html;


Sample config file (config.pl)
#!/usr/bin/perl
######################
# Declare module use #
######################

use DBI;
use Time::Local;
use HTML::Template;
use Image::Size ':all';  
use Image::Magick;
use File::Path;
use Net::SMTP;

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Question by:ghgan
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geotiger earned 20 total points
ID: 6926549
The answer is YES. The more module that you import, it takes longer to start the program and uses more memory.

It is because that use imports some semantics into the current package from the named module, generally by aliasing certain subroutine or variable names into your package.  It is exactly equivalent to

  BEGIN { require Module; import Module LIST; }

except that Module must be a bareword.


Geotiger.
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