[Halld-offline] Hall-D Computing plan and storage of simulated data.

[Curtis A. Meyer]

Thanks David -

    I concur with Richard that the grid infrastructure is critical and 
needs to be placed
into the plan somewhere. Also, in going through the numbers in the plan, 
I did not
fully understand all the SpecInt numbers that were there. It would be 
useful to have a
meeting where we go through these numbers before submitting the final 
plan. I am
sure that they are right, but I am just "slow".

   Curtis
On 2/11/11 1:38 PM, David Lawrence wrote:
> Hi All,
>
> Just a follow up to the discussion at the meeting on Wednesday. I'd
> mentioned that Mark had submitted the document I wrote up in 2008 when
> filling out Chip's original spreadsheet. The document titled "12GeV
> Computing Plan" is GlueX-doc-1431. As to the specific issue of storing
> simulated data, it has this in the second paragraph on page 2:
>
> "Hall-D currently plans to follow a computing model that stores very
> little simulated data on tape. The expectation is that it would be
> nearly as fast or faster to reproduce the data as it would be to read it
> off of tape and reprocess it. The “DST” files produced by the simulation
> are therefore only expected to need 10% of the disk space used for the
> raw, simulated data that will exist only on the farm nodes."
>
> This was not backed up by any hard numbers but I still suspect it is
> true. This refers only to what is needed regarding JLab resources and
> not what may be implemented outside of JLab (and JLab's budget). To my
> knowledge this represents what is our current Computing Plan for Hall-D.
>
> Regards,
> -David
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-- 
Prof. Curtis A. Meyer		Department of Physics
Phone:	(412) 268-2745		Carnegie Mellon University
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