[Halld-offline] computing model, alpha release

[Heyes Graham]

Thanks Mark, that's number overload. I'll make a quick pass at comparing this data with what Chip had from a few years ago.

Maybe something by late tomorrow. 

Graham

On Feb 15, 2011, at 2:24 pm, Mark M. Ito wrote:

> 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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