> 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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