Specifically,

This module's handler emulates the CGI environment, allowing programmers to write scripts that run under CGI or mod_perl without change. Unlike Apache::Registry, the Apache::PerlRun handler does not cache the script inside of a subroutine. Scripts will be "compiled" every request. After the script has run, it's namespace is flushed of all variables and subroutines.

The Apache::Registry handler is much faster than Apache::PerlRun. However, Apache::PerlRun is much faster than CGI as the fork is still avoided and scripts can use modules which have been pre-loaded at server startup time. This module is meant for "Dirty" CGI Perl scripts which relied on the single request lifetime of CGI and cannot run under Apache::Registry without cleanup.

It works because scripts are compiled at every request. I don't recommend using PerlRun unless you're trying to run an existing CGI script in mod_perl. If you're writting a script for mod_perl, you shouldn't use PerlRun.

In reply to Re^3: mod_perl and multi user environment - clashes with other users's data by ikegami
in thread mod_perl and multi user environment - clashes with other users's data by rsennat

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