When working with mod_cgi, you can change the code and rerun the CGI script from your browser to see the changes. Since the script isn't cached in memory, the server starts up a new Perl interpreter for each request, which loads and recompiles the script from scratch. The effects of any changes are immediate.
The situation is different with mod_perl, since the whole idea is to get maximum performance from the server. By default, the server won't spend time checking whether any included library modules have been changed. It assumes that they weren't, thus saving the time it takes to stat( ) the source files from any modules and libraries you use( ) and require( ) in your script.
If the scripts are running under Apache::Registry, the only check that is performed is to see whether your main script has been changed. If your scripts do not use( ) or require( ) any other Perl modules or packages, there is nothing to worry about. If, however, you are developing a script that includes other modules, the files you use( ) or require( ) aren't checked for modification, and you need to do something about that.
There are a couple of techniques to make a mod_perl-enabled server recognize changes in library modules. They are discussed in the following sections.
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