[Halld-offline] computing model, alpha release

[Mark M. Ito]

Folks,

Find attached a spreadsheet that estimates our computing needs. First 
the caveats:

    * this is not the finished product
    * it has to be translated into terms for Graham's spreadsheet
    * some of the numbers are still guesses
    * PWA is nowhere included
    * there will have to be a GlueX Note on this eventually
    * things could be much better organized in the spreadsheet
    * my spreadsheet skill could use an upgrade
    * the estimates do not distinguish between JLab-resident and
      non-JLab-resident resources
    * the way we refer to "CPU's" needs to more sophisticated
      (SPEC-int-like).

All of these will have to addressed. Still I thought that putting this 
out for discussion now would be better than waiting. So here it is.

I am assuming steady state. The idea is that we need to do all of these 
things for each set of data we take (take the data, calibrate it, 
reconstruct it, compact it into multiple streams, simulate it, 
reconstruct the simulation...). If we do them all at a rate slower than 
that at which we take the data, we will fall farther and farther behind 
as the years go on. So to avoid that we have to keep up with the raw 
rate. There will be an initial ramp up and there may be long will be 
down periods, but eventually we will be doing all of these things on 
each set and I am not accounting in detail for the aforementioned edge 
effects.

Note also that I assume the raw rate for this discussion is after a 
level three trigger, and that the at 10^7 the level three rejection rate 
is 0 and at 10^8 it is a factor of ten; i. e., independent of beam rate.

On PWA: if people already have a good way of framing our needs in this 
area, let me know. I haven't looked through our notes or web pages on 
this yet.

   -- Mark


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