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Folks,<br>
<br>
Find attached a spreadsheet that estimates our computing needs.
First the caveats:<br>
<ul>
<li>this is not the finished product</li>
<li>it has to be translated into terms for Graham's spreadsheet</li>
<li>some of the numbers are still guesses</li>
<li>PWA is nowhere included</li>
<li>there will have to be a GlueX Note on this eventually</li>
<li>things could be much better organized in the spreadsheet</li>
<li>my spreadsheet skill could use an upgrade</li>
<li>the estimates do not distinguish between JLab-resident and
non-JLab-resident resources</li>
<li>the way we refer to "CPU's" needs to more sophisticated
(SPEC-int-like). <br>
</li>
</ul>
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.<br>
<br>
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.<br>
<br>
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.<br>
<br>
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.<br>
<br>
-- Mark<br>
<br>
<br>
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