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

[David Lawrence]

Hi All,

     Yes, I just spoke with Mark and we both agree the grid 
infrastructure should be in the computing plan.

     I believe Mark and Simon have been working on some new numbers for 
the SpecInt requirements that
will replace those old ones. I assume we'll hear about that at the next 
offline meeting (... right guys?).

-David

On 2/11/11 3:27 PM, Curtis A. Meyer wrote:
> 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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>
>