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I've written an extension to RequestTracker for a client, but he says the performance isn't good enough. I'd like to do some profiling, but I'm not sure how to connect up a profiler (say NYTProf, for example)? I tried what the man page says and put PerlModule Devel::NYTProf::Apache in my apache config, but all I get in the results are Apache2:XSLoader, Devel::NYTProf::Apache and ModPerl::Util modules in the results, and neither my own nor RT's modules.

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Hi @Paul. This is a case where, in general, my favorite method only takes you part way, because you need visibility into round-trips between server and client, although here's a case where it was effective, even with a protocol in the middle. – Mike Dunlavey Feb 2 at 23:39
Not just server and client, but also between apache, the fast cgi server and PostgreSQL. Good luck trying to debug that with control c. Fortunately, the method I mentioned in my answer showed me that Dbd::pg::execute was the biggest time consumer, and pgfountaine showed me the queries that needed to be improved. – Paul Tomblin Feb 3 at 0:46
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You're right. 20 years ago I worked on a factory-floor system with multiple machines TTY-ing each other. It wasn't easy, but I managed to get time-stamped logs, from which I could trace the history of individual message flows across machines/processes. It wasn't fun, but I did manage to dig out some tumors. Glad you found something that works. – Mike Dunlavey Feb 3 at 1:34

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I don't much like it, but I ended up profiling it use the stand-alone version, with perl -d:NYTProf /opt/rt4/sbin/standalone_http

I'm leaving this open in case somebody comes up with a better solution.

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