On-Line DQ Shift Tools Questionnaire results (24 June, 2013)

1. On-Line DQShift ToolsQuestionnaire results(24 June, 2013) Bruce M. BarnettRutherford Appleton Laboratory

2. Overview Introduction Questionnaire (4) Conclusions 3/17 Respondents wrote: Not Applicable or Not Relevant. For the remaining 14 … Overview RC Workshop: On-Line DQ

3. Generic Tools: DQMD, OHP Detector specific Tools for Parameter-tracking, status-overview, etc Introduction RC Workshop: On-Line DQ

4. What DQ tools did your shifters rely on? DQMD, OHP (manual) or other DQMD: 10. OHP: 12. All that are using DQMD also monitored with OHP. Other: Special tools like L1CaloMap, TRP, gnaMon, TRT-Viewer. Two declared little or no online DQ monitoring. Questionnaire (1/4) RC Workshop: On-Line DQ

5. What was the approximate number of histograms shifters were asked to constantly or frequently check by eye for your system? Typically from 10-20. (Also for each muon sub-system) Tile and LArg use DQMD to alert the shifter that they should look through larger numbers of available histogrammes. The trigger monitors a larger number (~50) and the DQ shifter monitors a large number – 150. What was the approximate number of histograms checked automatically by DQMD algorithms? Questionnaire (2/4) RC Workshop: On-Line DQ

6. Did you encounter performance problems with DQMD in the ACR? Stability improved towards the end of run-1 Performance worst for users with >500 Histogrammes slow or failure at startup, slow refresh. One complained of inflexibility or difficultyin keeping updated. Did you encounter performance problems with OHP in the ACR? Problems reported lack-of-update, stability problems Slugishness (early on). Sluggishness and freezes due to a known memory leakissue. One labeled it as unusable. Questionnaire (3/4) RC Workshop: On-Line DQ

7. How useful did you find the checks done by the ATLAS DQ shifter? (ie, in addition to your system shifter’s monitoring) Six thought useful, or very useful. Six thought not useful. A couple observed that sub-detector shifters oftenfound the problems first but one noted that in a future with fewer shifters this wouldunderline the importance of a future role. The DQ shifter needs to be well trained, equipped with the rightup-to-date documentation and have a good overview of ATLAS operation Did you use the masking mechanism (from 2nd half of 2012 to temporarily suppress single histograms? Largely unused, at this point Three said they had, 11 had not. If yes, what was the policy as to who was allowed or supposed to mask a histogram? System Run Coordinator, System Experts, or the two in consultation. Or by a shifter under their instruction Specifically for histogramme debug or under known transient conditions Questionnaire (4/4) RC Workshop: On-Line DQ

8. DQMD Rather widely used, reducing shifter load But OHP histogrammes still important Tools Some Performance Issues Lack of scalability? DQMD Shifter Not yet critical role May be enhanced in small shift-crew model Extensive detector knowledge mandatory Conclusions RC Workshop: On-Line DQ