[Clas12_first_exp] Analysis trains and skims

[Francois-Xavier Girod]

Dear Eugene

Note that the trains are scheduled to run on a regular basis. Nevertheless,
the earlier the better.

Best regards
FX

On Wed, Aug 1, 2018 at 10:38 PM Eugene Pasyuk <pasyuk at jlab.org> wrote:

> Raffaella,
>
> Any definite date we need to come up with the train requests?
>
> -Eugene
> ------------------------------
> *From:* Raffaella De Vita
> *Sent:* Wed Aug 01 22:16:50 EDT 2018
> *To:* clas12_first_exp at jlab.org
> *Subject:* [Clas12_first_exp] Analysis trains and skims
>
> Dear All,
> here is more information about the status of analysis trains and about the
> feedback that would be useful to have from collaborators to start more
> accurate tests.
>
> Gagik has released the first version of the analysis train software.
> - Analysis trains are conceived to do "event selection": they use DSTs as
> input, i.e. cooked files with all events but only the banks that are
> relevant for the analysis (see Nathan's documentation at
> https://clasweb.jlab.org/wiki/index.php/CLAS12_DSTs), and for now to
> output skims for different event topologies with the same hipo format and
> the same banks of the input files.
> - Different skims, defined based on user requests, make the train
> "wagons". After collecting user requests for wagons, trains will be run
> centrally by a single chef, to optimize the efficiency of the skimming
> process and avoid I/O problems that are expected to arise with several
> people trying to access large DST volumes simultaneously.
> - Skim conditions can be defined based on the number and type of final
> state particles as explained in Gagik's documentation at
> https://userweb.jlab.org/~gavalian/docs/sphinx/hipo/html/chapters/analysis_train.html#event-filters.
>
>
> To define the first trains and start testing the overall process, we would
> like to ask collaborators to come up with requests for final state
> topologies for their favorite reactions:
> - check the instructions at
> https://userweb.jlab.org/~gavalian/docs/sphinx/hipo/html/chapters/analysis_train.html#event-filters
> and send us your "wagon" definition;
> - keep in mind that, for a skim to be useful, it should correspond to a
> small fraction of the input data; you can estimate the reduction factor of
> your proposed skimming condition using the sample DSTs available in
> /work/clas12/clas12/data/calib/dst_5bp6p1/; the overall train output size
> (sum of all skims that will be collected) should be less than 50% of the
> input DST;
> - once requests will be collected and reviewed to remove possible
> duplications, a train will be assembled and tests will begin.
>
> Best regards,
>     Raffaella
>
>
>
>
>
> Latifa Elouadrhiri wrote:
>
> Dear all,
>
> The meeting this morning is cancelled.
>
> The meeting agenda for next week will focus on the following:
>
> *Spring Run*
>
>    - Status of the data processing
>    - Analysis trains for each one of the major analysis group: please
>    send me the requested filtering so far I have the one from SIDIS (Harut)
>    and From Nucleon Structure (Ralf).
>
> *Fall Run*
>
>    - We will review where we are in term of tracking efficiency based on
>    the latest release and make decision on the luminosity for the upcoming run
>    - List of run coordinators
>    - Run plan
>
> Best regards,
>
> Latifa
>
>
>
>
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