sPHENIX is a new detector at RHIC.

[pinkenburg <pinkenburg AT bnl.gov>]

    Hi Ross,
    
    looks good. 
    
    But our offline event building should be mentioned. Given that this
    is the one thing which sets us apart from any other experiment (and
    IMHO will be the future for streaming readout if the data rate can
    be handled) it should get its own slide. It is implicitly mentioned
    in slide 5 but I would point out the advantages of this approach in
    the next slide.
    )  It reduces the complexity of the online system, one less real
    time thing to worry about
    )  The event builder has only to deal with the average rate, not
    peak luminosity. Actually in our case we don't have a separate event
    building step - in the meantime raw data is just assembled on the
    fly as part of the reconstruction.
    ) Events are time ordered which makes the workflow so much easier
    compared to the usually scrambled events order from an event builder
    farm (e.g. applying calibrations, having luminosity blocks)
    ) We can separate the calorimeter reco and tracking and read only
    the necessary subset of the data
    
    ) It comes at the price that reprocessing needs to get many files
    from tape which makes processing directly from tape impossible and
    would cause some logistical headaches for remote processing (you
    would assemble events at BNL and then send those files out for
    processing)
    
    In the summary I would add that RHIC has been optimized for 20
    years, so compared to other experiments we will get blasted on day 1
    rather than ramping up with the accelerator. And there is one small
    issue - our readout is not untriggered. The calorimeters (and
    MBD,EPD) are still triggered and those triggers cut out
    corresponding timeslices of the streamed readout as you point out in
    slide 6.
    
    Good luck with the talk,
    
    Chris

On 7/3/2022 2:05 PM, Ross Corliss via sPHENIX-l wrote:

      Dear All,

I've posted draft slides for the sPHENIX data reconstruction talk at https://indico.bnl.gov/event/16174/contributions/64794/attachments/41947/70236/sPHENIX.Data.Reco.ICHEP.2022.pdf

The time slot is 15 minutes, so I assume 12.5+2.5 for talk+questions.  It takes place in the computing session on Friday, July 8:  https://agenda.infn.it/event/28874/contributions/169210/ (11:30 AM local conference time)

I welcome any comments or suggestions you may have, and I'll second Murad's earlier thanks to all the speakers who have uploaded their slides for the collaboration meeting and other recent reports.

Gratefully,

-Ross

==========
Dr. Ross Corliss
Research Assistant Professor
Center for Frontiers in Nuclear Science
Stony Brook University
virtual office:  https://stonybrook.zoom.us/my/rossoffice?pwd=ZmZ2SlRIMVFvUUJwbUkyOVNVTmE5QT09

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Christopher H. Pinkenburg	;    pinkenburg AT bnl.gov
				;    http://www.phenix.bnl.gov/~pinkenbu

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