The enterprise mod_perl architectures idea that I posted earlier has evolved
into a slightly modified idea: a 'scaling mod_perl' site:
http://www.lifespree.com/modperl.
The point of this site will be to talk about & synthesize techniques for
scaling, monitoring, and profiling large, complicated mod_perl
architectures.
So far, I've written up a basic scaling framework, and I've posted a
particular development profiling tool that we wrote to capture, time, and
explain all SQL select queries that occur on a particular page of a mod_perl
+ DBD::Oracle application:
-http://www.lifespree.com/modperl/explain_dbitracelog.pl
-http://www.lifespree.com/modperl/DBD-Oracle-1.06-perfhack.tar.gz
Currently, I'm soliciting thoughts and code on the following subjects in
particular:
1. Performance benchmarking code. In particular, I'm looking for tools that
can read in an apache log, play it back realtime (by looking at the time
between requests in the apache log), and simulate slow & simultaneous
connections. I've started writing my own, but it would be cool if something
else out there existed.
2. Caching techniques. I know that this is a topic that has been somewhat
beaten to a pulp on this list, but it keeps coming up, and I don't know of
any place where the current best thinking on the subject has been
synthesized. I haven't used any caching techniques yet myself, but I intend
to begin caching data at the mod_perl tier in the next version of my
application, so I have a very good incentive to synthesize and benchmark
various techniques. If folks could just send me pointers to various caching
modules and code, I'll test them in a uniform environment and let folks know
what I come up with. Or, if someone has already done all that work of
testing, I'd appreciate if you could point me to the results. I'd still like
to run my own tests, though.
If folks could point me towards resources/code for these topics (as well as
any other topics you think might be relevant to the site), please let me
know. I'm offering to do the legwork required to actually test, benchmark,
and synthesize all of this stuff, and publish it on the page.
I'm also still interested in actually talking with various folks. If anyone
who has been through some significant mod_perl scaling exercise would like
to chat for 15-30 minutes to swap war stories or tactical plans, I'd love to
talk with you; send me a private email.
cheers,
Ed
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