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From "Turner, John" <>
Subject RE: Tomcat Scalability - Long
Date Thu, 24 Oct 2002 19:31:39 GMT

We host 15 separate Tomcat instances (3.1) on a single machine.  The apps
use MySQL.

The machine is dual-P3 1GHz, 2GB RAM.  Red Hat 7.2, Apache 1.3.26.  The
connector is mod_jserv.  Not sure which JDK, probably 1.3.

The usage is high, all of the apps are graphics manipulation apps serving
users globally (Pacific Rim, North America, Europe), 24/7.  The apps require
frequent callouts to third party apps like Adobe Distiller using standard
command-line calls (no API or other integration).

Uptime is 139 days, load rarely goes over 50%.  I did restart all of the
Tomcats last week, but that was due to an application patch.  Prior to that,
they hadn't been restarted in several months, and I don't plan to restart
them for a couple more, when the next patch is released.

Knock on wood, perhaps we've been lucky, but I think our situation is pretty
normal, and definitely what I would expect in a UNIX environment.


> -----Original Message-----
> From: Brandon Cruz []
> Sent: Thursday, October 24, 2002 3:36 PM
> To: Tomcat Users List
> Subject: Tomcat Scalability - Long
> Does anyone have any solid information about the scalability 
> of Tomcat?  It
> seems very limiting to me, but that is hopefully due to improper
> configuration.  Here is our situation and what seems to be 
> happening under a
> small amount of stress.
> ---About our Environment---
> PIII 1.0Ghz
> 512 Meg Ram
> Linux RedHat 7.1
> MySQL Database
> Apache 1.3.x
> mod_jk - logging turned all the way down
> Tomcat 3.2.4 - contexts *are* reloadable right now
> SUN JDK 1.3.1_01
> ---About our Application---
> Our Application is a content management tool that reads and 
> writes to the
> MySQL Database and reads and writes files.  All the pages within this
> application are served by Tomcat 3.2.4.  About 80-120 people 
> per day log
> into this application and spend anywhere from 10 minutes to 
> one hour working
> on the application.  At any given time there are between 15 
> and 50 active
> database connections.

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