Make sure you really call Apache::DB->init before loading any of the code you want to profile. From the article:
Note that you must call Apache::DB->init(); prior to whatever code you are attempting to debug. To be safe, I always just put it as the very first thing in my startup.pl.

In reply to Re: Measuring mod_perl with Apache::DProf by perrin
in thread Measuring mod_perl with Apache::DProf by redhotpenguin

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