Difference between revisions of "GlueX Level-3 Trigger Meeting, Apr 20, 2017"
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* We discussed the current status of the trigger rate and event size projections in order to catch Eugene up | * 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 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 high intensity running solution at the review that does not require L3 farm. |
* There was some discussion on how to present the FCAL+BCAL+ST trigger. | * 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> γ/s. This would leave no margin. | ** 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> 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 | ** 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 -> π<sup>o</sup>γp) and see what is thrown away if an ST is required | ** Eugene suggested we look at existing data for a channel that may be affected by an ST cut (e.g. γp -> ωp -> π<sup>o</sup>γp) and see what is thrown away if an ST is required | ||
+ | * Items needed for high intensity running that will need to be budgeted: | ||
+ | ** 10Gb switch for Tagger hall + up to 4 10Gb mezzanine cards for the tagger crates | ||
+ | ** Additional large raid disk | ||
+ | ** These and other online costs for next 3 years was put into spreadsheet on Mar. 10th and provided to CC | ||
+ | *** https://docs.google.com/spreadsheets/d/1UxFy82k6vsh4ksqoCJ4mlyRuEAIcJoQBCOjEH3cz2_w/edit#gid=0 | ||
== Action Items == | == Action Items == |
Latest revision as of 17:18, 20 April 2017
Contents
Meeting Info.
Meeting Time And Location
15:00 EST (JLab time)
CC F326
Connecting
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Background Information
(Click expand for some links to background information -->)
Base Material
Agenda
- Announcements
- Date change: Review will be 1 week earlier on May 11 13:00-17:00
- Previous Meeting (Apr 13, 2017)
- Current Status
- Data Rates (David L.)
- May 11 review
- 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 high intensity running solution at the review that does not require L3 farm.
- 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
- Items needed for high intensity running that will need to be budgeted:
- 10Gb switch for Tagger hall + up to 4 10Gb mezzanine cards for the tagger crates
- Additional large raid disk
- These and other online costs for next 3 years was put into spreadsheet on Mar. 10th and provided to CC
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.