Difference between revisions of "GlueX Level-3 Trigger Meeting, Apr 20, 2017"

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=Minutes=
 
=Minutes=
  
''TBD''
+
Attendees: David L., Sergey F., Alex S., Eugene C.
 +
 
 +
* We discussed the current status of the trigger rate and event size projections in order to catch Eugene up
 +
* There was consensus that with the existing readout hardware rate limitations and reduced event size, a L3 farm solution is no longer warranted. We will present a solution at the review that does not require L3.
 +
* There was some discussion on how to present the FCAL+BCAL+ST trigger.
 +
** Without the ST in the trigger and using our Spring 2017 FCAL+BCAL thresholds we would be near (and possibly slightly over) the hardware limits for data readout when running 5 x 10<sup>7</sup> &gamma;/s. This would leave no margin.
 +
** With the ST in the trigger the L1 rate is reduced by a factor of about 1.6
 +
** Eugene suggested we look at existing data for a channel that may be affected by an ST cut (e.g. &gamma;p -> &omega;p -> &pi;<sup>o</sup>&gamma;p) and see what is thrown away if an ST is required
 +
 
 +
== Action Items ==
 +
* Compare most recent data volume estimate provided to CC to one using a 2GB/s data rate. Discuss with CC to see if this causes any concern (David)
 +
* Look at &gamma;p -> &omega;p -> &pi;<sup>o</sup>&gamma;p channel and see what is discarded when ST hit is required. (Alex, David)
 +
* Start outlining talk and gathering slides so we can review at next meeting (David)
 +
 
 +
== Next Meeting ==
 +
 
 +
We will meet again on Thursday next week at 3pm. Room A110 is reserved.

Revision as of 17:07, 20 April 2017

Meeting Info.

Meeting Time And Location

15:00 EST (JLab time)

CC F326

Connecting

You can connect using BlueJeans Video conferencing (ID: 198 332 417). (Click "Expand" to the right for details -->):

  1. Make sure you have created a BlueJeans account via your JLab CUE account using this link:

  2. Meeting ID: 198 332 417
    • (you may need to type this in, depending how you connect)

  3. If connecting via Web Browser: click this link (no passcode is needed):

  4. If connecting via iOS or Android App:
    • Use your JLab e-mail address to log in and then enter the meeting ID given above to join the meeting

  5. If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"

  6. If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above

Background Information

(Click expand for some links to background information -->)

Base Material

  1. David L. 1/23/17 L1 meeting
  2. Alex S. collab. meeting talk
  3. David L. collab. meeting talk

Agenda

  1. Announcements
    • Date change: Review will be 1 week earlier on May 11 13:00-17:00
  2. Previous Meeting (Apr 13, 2017)
  3. Current Status
  4. May 11 review
  5. AOT

Minutes

Attendees: David L., Sergey F., Alex S., Eugene C.

  • We discussed the current status of the trigger rate and event size projections in order to catch Eugene up
  • There was consensus that with the existing readout hardware rate limitations and reduced event size, a L3 farm solution is no longer warranted. We will present a solution at the review that does not require L3.
  • There was some discussion on how to present the FCAL+BCAL+ST trigger.
    • Without the ST in the trigger and using our Spring 2017 FCAL+BCAL thresholds we would be near (and possibly slightly over) the hardware limits for data readout when running 5 x 107 γ/s. This would leave no margin.
    • With the ST in the trigger the L1 rate is reduced by a factor of about 1.6
    • Eugene suggested we look at existing data for a channel that may be affected by an ST cut (e.g. γp -> ωp -> πoγp) and see what is thrown away if an ST is required

Action Items

  • Compare most recent data volume estimate provided to CC to one using a 2GB/s data rate. Discuss with CC to see if this causes any concern (David)
  • Look at γp -> ωp -> πoγp channel and see what is discarded when ST hit is required. (Alex, David)
  • Start outlining talk and gathering slides so we can review at next meeting (David)

Next Meeting

We will meet again on Thursday next week at 3pm. Room A110 is reserved.