[G12] [Fwd: [g13] Ratio of results files to original data]

[Daria Sokhan]

Hi Gagik, Lei,

Yes, the BOS file I talk about is the whole thing with all the banks
included in cooking (and we had loads of them). The DSTs are the files
Ken prepared, I don't know if they are skimmed down in the number of
banks (I think so) or just compressed.

My output file is not a skim for everyone's analysis -- just the
four-vector results of my channel selection (proton pi-) and a load of
histograms I fill along the way to check my selections and cuts. It
doesn't have any banks. There are a few ntuples containing relevant
event data which I calculate asymmetries from afterwards. It's not a
magic way of reducing massive data-files to a few kilobytes, I'm
afraid! I think perhaps there's confusion here -- I emailed it round
only because Pawel wanted to see how much space my results files would
take up (to see if any more monitoring histograms can be added).

Sorry to disappoint!

Daria





On 5 May 2010 20:34, Gagik Gavalian <gavalian at jlab.org> wrote:
> Hi All,
>
> I'm currently working on a different DST standard (other than BOS or ROOT),
> with compression ! And this conversation got me curious.
> 0.05% seems extreme for all the information stored !
> Can you guys be more specific what information is stored in this DSTs ?
> because the reduction I get from BOS files is only about 50%.
> But when I compare, I compare the information stored only in HEAD,TAGR, and
> PART banks.
>
> I assume Daria meant the whole BOS file with all the banks in it, am I right
> ?
>
> Gagik.
>
> lguo at jlab.org wrote:
>>
>> Hi, Daria,
>>
>> How are you? Is your work documented somewhere? Can we reproduce what you
>> did for g13 easily in g12?
>>
>> Thanks!
>>
>> Lei
>>
>> ---------------------------- Original Message ----------------------------
>> Subject: [g13] Ratio of results files to original data
>> From:    "Daria Sokhan" <daria at jlab.org>
>> Date:    Wed, May 5, 2010 5:44 am
>> To:      g13 at jlab.org
>> --------------------------------------------------------------------------
>>
>> Hi Pawel and all,
>>
>> As asked I compared the sizes of my output files with the cooked BOS
>> files. The ratio is about 0.000087. But I run on DSTs, which are
>> already enormously smaller, and ratio of my output file to input DST
>> is 0.00054, so about 0.05%.
>>
>> For example the three BOS files for 55125.A01 (B00-B02) add up to
>> 4.753227 G, the single DST file for 55125.A01 is 772.36 M while my
>> output root file is just 418 K. In general, my output files varied
>> from about 400K to 800K in size.
>>
>> The ratio might be different after the next cooking depending on extra
>> banks being dropped from / added to the cooked files.
>>
>> Cheers,
>> Daria
>>
>>
>
>
>



-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Daria Sokhan
Institut de Physique Nucleaire
Bat 100 - M055
Orsay 91406                              tel: +33 1 69 15 45 00
France                                      fax: +33 1 69 15 64 70
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