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Optimizing ROB ID Generation for Event Processing Efficiency

Understand the key parameters such as Station Name, Eta, and Phi to generate unique ROB IDs efficiently. Learn about error handling strategies during RPC decoding in the online data processing system.

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Optimizing ROB ID Generation for Event Processing Efficiency

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Presentation Transcript

  1. From AtlasID to ROBID

  2. Atlas ID • StName/StEta/StPhi/DoubletR/DoubletZ/DoubletPhi/GasGap/MeasuresPhi/strip • I primi 4 identificano la collezione offline (da utilizzare per ottenere l’hashID) • St. Eta ( da -8 a +8) • Serve solo il segno per capire il Side A (+) e side C (-) • St. Name (BOL,BML,BOS,BMS,etc..) • St. Phi (da 1 a 8) • DoubletPhi (equivalente a HV RO sulle stazioni a muoni) • Servono per stabilire il settore di trigger e quindi il ROD • Doublet R è ininfluente nella selezione del ROB ID

  3. Settori di Trigger e Station Phi • View from side C to Side A Station Phi = 2 Station Phi = 1

  4. Atlas ID

  5. Atlas ID • La tabella ha 64 entries • Possible o una lookup-table o un algoritmo • Utilizzando solo StName/StEta/StPhi dunque, si possono ottenere 2 ROBID differenti. • Solo utilizzando anche dblPhi si ottiene un ROBID univoco.

  6. Error Handling in Online RPCDecoding

  7. Possible data fragment errors • NO_RX_FRAG • No Rx frag inside ROD frag. Skipping event • BAD_RX_FRAG • Rx frag is corrupted. Skipping rx frag • NO_PAD_FRAG • No PAD frag inside Rx frag. Skipping • BAD_PAD_FRAG • PAD frag is corrupted. Skipping pad frag • NO_CM_FRAG • No CM frag inside PAD frag. Skipping • BAD_CM_FRAG • CM frag is corrupted. Skipping CM frag

  8. Still missing • Too long events are truncated by ROD and flagged. • No reaction by Decoder, also good subfragments rejected. • No check of error words inside the fragments footer. • Only stored in the containers without any reaction.

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