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

On-Line DQOn-Line DQShift ToolsShift Tools

Questionnaire resultsQuestionnaire results(24 June, 2013)(24 June, 2013)

Bruce M. BarnettBruce M. BarnettRutherford Appleton LaboratoryRutherford Appleton Laboratory

OverviewOverview

•Overview•Introduction•Questionnaire (4)•Conclusions

• 3/17 Respondents wrote: Not Applicable or Not Relevant.• For the remaining 14 …

RC Workshop: On-Line DQ24 June, 2013 2

IntroductionIntroduction

•Generic Tools:• DQMD, OHP

•Detector specific Tools for• Parameter-tracking, status-overview, etc


Questionnaire (1/4)Questionnaire (1/4)

• 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.



•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?



• 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 difficulty

in 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 leak issue.

• One labeled it as unusable.



• 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 often

found the problems first• but one noted that in a future with fewer shifters this would

underline the importance of a future role. • The DQ shifter needs to be well trained, equipped with the right

up-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


• 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

ConclusionsConclusions


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

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