Does anyone know of a good whitepaper or such that covers capacity planning issues with Cold Fusion?
There's not really such a thing. Every ColdFusion application is different and have wildly different capacity requirements.
What I'd like to know is a formula that takes in: hits per time period average size of pages
This is bandwidth capacity planning and non-specific to CF.
num database calls per page
Not really relevant unless you are hitting a DB licensing issue. Time spent on the DB might be more interesting.
database size
Not CF related -- specific to Database vendor and application.
and can return: Suggested hosting infrastructure Maximum user load Average response time
The *only* way to determine this is load testing. There is no formula.
As well as a methodology on how to identify performance bottlenecks etc... This is all pretty standard stuff in the IT world, so I'm assuming someone has developed this kind of stuff specific to CF...
Load testing methodologies is what your after. CF is just the engine the capacity planning is done based on the application. The only stuff that is really going to be CF specific are changes in the CFADMIN:
- threads per CPU
- trusted cache, etc
- JVM min/max memory
- other JVM tweaks (eg garbage collection)
-- geoff http://www.daemon.com.au/
PS. I did a presentation on CFADMIN bits a while back that might be useful: CFMX Admin: made easy-breezy (http://blog.daemon.com.au/archives/000158.html)
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