Hello,
I applied the patch, and caching now works (thanks Gerald!). I tested the
following lines in my httpd:
EMBPERL_CACHE_KEY_OPTIONS 0
EMBPERL_CACHE_KEY_FUNC "sub {return $ENV{REQUEST_URI}}"
Which seems to have solved my problem of the cache not making the distinction
between:
http://host/foobar
and
http://host/helloworld
I don't see a way to explicity tell EmbPerl to 'not cache' certain pages. I
ended up making the cache_key_func call another sub that performed additional
logic to set the key to "", and I used a EMBPERL_EXPIRES_FUNC to always
expiring those queries.
The benchmark results so far show a very significant improvement (>2x) when
replaying the user logs for a duration of time about as long as the expiration
time. I have a lot of queries to the home-page for each city, so caching those
alone is significant. Incase anybody is currious to see another EmbPerl site,
mine is at (http://beethere.net/). I should have caching on the live site in
the next couple days.
The only awkwardness I'm now seeing is that Embperl seems to sometimes call
the cache_key_function multiple times per request. I added a 'print STDERR
'FOO' to the sub, and I occationally see the message get printed multiple times
(~11).
I highly recommend applying the patch, and giving caching a whirl. It's a nice
performance gift from Gerald, and easier to set up than most dedicated caching
systems.
Happy Holidays,
-Carl
----- Original Message ----
From: Gerald Richter <[EMAIL PROTECTED]>
To: Carl Eklof <[EMAIL PROTECTED]>; [email protected]
Sent: Wednesday, December 21, 2005 00:13:30
Subject: RE: Using EmbPerl's Caching Functionality
Hi,
> 1) I couldn't get EMBPERL_CACHE_KEY_FUNC, or
> EMBPERL_EXPIRES_FUNC to work in my httpd.conf (and I do have
> Embperl_UseEnv on) Trying to set either one would cause
> Apache to seg fault.
>
>...
> Does anybody have any working sample of the EMBPERL_CACHE_KEY_FUNC?
>
The attached patch should fix both the xx_FUNC parameters in httpd.conf.
Note that EMBPERL_CACHE_KEY_FUNC can only be defined in httpd.conf, but not
inside the page itself (as EMBPERL_EXPIRES_FUNC does)
Gerald
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