How to track concurrent instances of a process?

We have an application that will spawn multiple instances of the same process to run multiple reports concurrently.  How do I set up a Platform Service (or something else) to track the number of these processes over time?  Product tech support wants to know who many are running when we experience our reporting problems.

This is on a Linux box and we're using vFabric Hyperic 5.0 Enterprise.

Thanks,

Rodd