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From "Jeff Kilbride" <>
Subject Re: Performance of AJP12 vs. AJP13
Date Tue, 10 Apr 2001 22:35:24 GMT
Yeah, it surprises me a little. All the docs say ajp13 is faster due to it's
connection re-use.

I tested mod_jserv (ajp12) against mod_jk (ajp13) in my own tests and found
mod_jk to be about 40% faster. It also scaled more smoothly and handled the
load less erratically. I was doing simple inserts into a MySQL database from
my servlet. However, I didn't test mod_jk (ajp12) vs. mod_jk (ajp13). I
might have to go back and try that...


----- Original Message -----
From: "Tom Mahaffey" <>
To: <>
Sent: Tuesday, April 10, 2001 5:48 AM
Subject: Performance of AJP12 vs. AJP13

> I've been developing/testing/staging with Apache 1.3.14 / mod_jk / Tomcat
> 3.2.1 for the last
> several months (started with Tomcat 3.1 and upgraded to 3.2.1 soon after
> its release).
> I had not seen any performance problems (of course!) until I hit
> and saw my CPU
> utilization go through the roof and my app's response time slow to a
> crawl.  After cruising
> through the mailing list archives, I tried using mod_jk as a handler
> (instead of a filter) and
> tried upgrading to JDK1.3 from JDK1.2.  Neither of these gave much of a
> performance
> increase.
> The one thing that gave me a dramatic increase in speed was to change my
> JkMount
> directives to use AJP12 workers instead of AJP13.  Using the Apache
> benchmark tool (ab), I saw
> an increase of 5-fold or more for the number of requests per second I
> handle.
> Does this surprise anyone out there?  I saw advice for speeding mod_jk,
> did not come
> across using AJP12 instead of AJP13.  In addition to a increased rate of
> requests per second,
> my application server hardware also seems to be spending less cycles on
> individual
> httpd processes as well as the Java process which owns the running Tomcat.
> Particulars:
>      + Solaris 2.6
>      + Apache 1.3.14
>      + Tomcat 3.2.1 binary drop
>      + mod_jk compiled as shared object from Tomcat 3.2.1 source
>   -mahaffey

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