Ken Perl wrote:
> Is it possible to make a modperl application to run in cluster?


Of course.

> if yes, how to do that?


The same as any other web system -- multiple machines, a load balancer,
shared data on a database or other system.

> any doc?


Tons of them. Practically any doc about clustering will apply. I wrote
one ages ago about one mod_perl site I worked at:
http://perl.apache.org/docs/tutorial...oys/etoys.html

Is there some specific part you're having trouble getting your head around?

- Perrin