Hi, I recently inherited a mod_perl project that is making my life pretty difficult. The main problem is that I can't easily duplicate the environment for fixes and development, so I have to resort to messing at the production environment directly. This leads to the general question of perl instrumentation.

I'm wondering whether it's possible to add, say tracing or other logging, to the production code without making any changes to code? In my java projects, I've played with some tools that can instrument the java bytecode via a custom class loader, thus adding logging information to a live system without code changes. I've looked at Hook::LexWrap, not really sure whether it's the right tool. Ideally I'd like to write some code which gets loaded when mod_perl starts, that will add tracing information to some specific modules or functions. Is that possible?

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