EPSCI SRO Meeting Mar. 8, 2021

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The meeting time is 2:00pm.

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Meeting ID 680 566 960

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Agenda:

1. Previous Meeting
2. Announcements
   • New EPSCI group member: Michael Goodrich
   • The EIC SRO workshop doodle poll
   • EIC Progress Report (due Friday Mar. 5th)
3. Mailing list?
4. ERSAP development
   • INDRA VTP setup
   • INDRA SAMPA setup
     • Possible use in TDIS/GEM (Holly S.)
     • INDRA-ASTRA (Markus D. + students)
5. VTP Data Format
6. CLAS12 TriDAS & ERSAP
7. AOT

Useful References

• SRO Meetings
• CLAS12 SRO page
• ERSAP Document
• Vardan's WMS draft
• Vardan's SRO sketch
• Graham's Paper describing SRO
• Dave Abbott's slides on data format

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Minutes:

Attendees: Mike G., Nathan B., David A., Carl T., Chris L., Jie C., Vardan G., David L.

• Send connection information to Dave A. about the FPGA² meeting in Wed.
  • Discussed existing cards at JLab. Dave A. said one was already in indras2.

• Data Lake
  • Discussed disk buffering. Chris pointed out that for it to be effective one would need to pre-buffer data and not wait for buffers to fill before trying to write to disk
  • Pre-emptive buffering requires all data be written to disk. This would limit the speed of the lake and would wear out the disk pretty quickly.
  • Decided it would generally be better to just drop frames in cases when falling behind.

• Mailing list
  • David L. will check with Marco on status
  • Decision on dedicated mailing list for this group will be made and implemented by next meeting (in 2 weeks)

• SAMPA
  • Is there something we are waiting on Ed for?
    • Ed was expecting some new cards to be delivered that are compatible with the FELIX cards
  • Dave A.: Data can be streamed to alkaid
    • Dave A. will check on system and see what needs to be done to get it working again. He feels it worthwhile to have the testbed operational.
  • Nothing heard from Holly for a while on her plans for SAMPA. David L. will reach out.

• VTP
  • Large spikes in frame loss reduced significantly
  • Lost frames seem to come in bursts
  • New scripts are in place to allow remote control over the trigger rate