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Reuse and Recycle

If your mod_perl enabled Apache server only needed to execute your Perl scripts one time, forever, we probably wouldn't need this article. Or mod_perl. Or the Internet, for that matter. So it's established that your scripts need to run repeatedly, whether "repeatedly" means once per day, once per minute, or ten times per second. Nobody likes doing the same thing over and over, Apache included -- it's silly and inefficient to repeat an entire task every time you need to reach a certain goal. This brings us to the core purpose of optimization:

Suppose that you need to wash a sinkful of dirty dishes. You'll need hot water from the tap to fill the sink and an open bottle of dish washing detergent, preferably the kind that leaves your hands silky smooth. You could turn on and off the tap for each dish, waiting for the water to get hot each time, re-close and re-open the detergent bottle for each dish, and so on. An onlooker would probably observe that you're not the sharpest tool in the shed -- and they'd be right. But without optimizations, this is exactly what we do with Apache everytime a Perl script is executed: turn on and off the tap water for each dish, wait for the water to get hot, re-open the detergent bottle, and so forth.

To get the most out of mod_perl, we need to think about how mod_perl re-uses compiled code, and design a strategy that best balances the efficiencies of re-using compiled code versus the costs in memory consumption. Understanding mod_perl in this way means understanding the parent-child relationship, which we mean in a purely server-centric way, and not at all in a Dr. Laura/John Bradshaw/Benjamin Spock sort of way.

Contents:

Who's Your Daddy?
More Who's Your Daddy
Database Savoir Faire
Building the Optimized Beast
Conclusion and Resources

Conclusion
The Perl You Need to Know
Who's Your Daddy?