RE: cluster software

Kevin,

My understanding is that the servlet container (tomcat) starts a new thread
for each servlet instance. All the treads run in the same server process
(tomcat).

I am not sure of the cluster software will allocate based on Java threads or
server processes. It could be a fun project to test out.

Now, if I can just find those spare 20 hours when I am not sleeping to fool
around with this idea....

Mark Phillips
Phillips Marketing, Inc.
602 524-0376 office
480 945-9197 fax
mark@phillipsmarketing.biz


-----Original Message-----
From: plug-discuss-admin@lists.plug.phoenix.az.us
[mailto:plug-discuss-admin@lists.plug.phoenix.az.us] On Behalf Of Kevin
Brown
Sent: Tuesday, July 13, 2004 11:13 AM
To: plug-discuss@lists.plug.phoenix.az.us
Subject: Re: cluster software

> A real clustering newbie question....
>
> Would a cluster of several PCs using Pentium processors running
> apache/tomcat be equivalent in throughput a single PC with a Pentium III
or
> IV processor running apache/tomcat as a web server serving JSPs and
running
> Java code?
>
> Just curious as I have some old Pentium and Pentium IIs that are ready for
> the junk pile.

There are two reasons for utilizing clusters.

1) You have a problem that can be broken into smaller chunks and the output
when
recombined gives you the overall solution.

2) You want to divide the load of an application across multiple systems to
help
it scale.

Type 1 would be what a lot of clusters are being built for in the
scientific/research area. Take a large, comlex problem and divide it into
smaller, more manageable chunks to get to a solution

Type 2 sounds more like what you are describing with Apache/Tomcat.

Will you get equivalent performance? This depends on the number of users
hitting
the system and the way the application is built (e.g. what is it designed to

do). If it is a single user/threaded application, most likely, no... If
you
are getting lots of users hitting the systems or the application can start
up
multiple threads to deal with a request, maybe.
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