Central Shifts and On-Call for 2011 Run

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All groups in CMS are expected to contribute to the central operation of CMS. This wikipage collects information about what central shifts and on-call tasks give credit and what is expected from the person that takes these tasks.

There are four groups of central shifts and on-call tasks that give credit for central shifts:

  • Shifts and on-call for P5:
    • 2 Run Field Managers
    • Shiftleader
    • DAQ shifter and one on-call
    • Trigger Shifter and one on-call
    • HLT (on-call)
    • DCS (or technical shifter) and one on-call
    • DQM and one on-call
    • BRM on-call
    • Offline Run Manager (ORM)
    • Technical Coordination (carry 165000 phone)
  • Offline DQM (at CERN, FNAL, or DESY):
    • Shifter
  • Computing:
    • Offline shifter and one on-call
  • Subsystem on-call ("D.G" or Detector Guru - if we make Greg happy!)
    • Pixel
    • Strips
    • ECAL
    • HCAL
    • DT
    • RPC
    • CSC
    • Lumi

This adds to 7 shifters and 18 on-call experts plus the two Run Field Managers. As the requirements, schedules, etc. for these different types of shifts are slightly different they will be discussed separately below.

For 2011 the operations start on February 8 and ends on December 12. Including some overhead for MWGR and startop and stop of the run this means we will have to cover 48 weeks of operation. The total number of weights to be covered in 2011 will be 16000 (including a 5% contingency). Taking into account the number of CMS signing authors the total sum of ‘weights’ that each institute will have to contribute is #of signatures*7.7. However, institutes that did not take their quota of shifts last year will carry forward this deficit. This accounts for about 3,000 shift credits. Subtracting this from the 16000 we find that each author needs to take 6.3 shifts next year (+ any deficit from 2010).

We expect the central shift load to be shared through the whole collaboration. The required number of shift credits for each institution is available here (preliminary).

Example: an institute with 6 authors will have to contribute 38 points, i.e. one shifter taking a little bit more than a DAQ quantum (32) or two shifters taking each a little bit more than a DQM quantum(16). (If the institute owed shifts from 2010 these numbers would be larger.) In other words the load will have to be taken by a reduced number of people in order to satisfy the requirement that each shifter has to do a minimum number of shifts depending on the central shift task chosen: for example if an institute would provide ONLY DAQ shifters (min weights 32 ) it would involve only half the number of shifters compared to make the choice of doing only DQM shifts (min weights 16).

Shifts and on-call for P5 operations


These shift blocks will apply to P5 based central shifts (for offline DQM and computing shifts, see below). The shift selection page looks as shown below: once you select any shift In a block you get assigned the whole block.


Blocks forbidden by CERN rules will not be selectable. You have the possibility to assign one of your shifts to another shifter of equal competence in case of need. Selection will be on a first come-first serve basis. If a shifter wants to cancel a block (after having saved!) he/she will have to contact the shift manager. For instruction on usage of shift tool: https://twiki.cern.ch/twiki/bin/view/CMS/OnlineWBShiftToolInstructions

CERN safety rules will be applied: these can be summarized as:

  • No more than 5 night shifts in a row
  • At least one day rest in any 7 days period
  • Any two shifts must be separated by at least 16 hours
We assign a weight to each shift:
  • Week Morning: 0.75
  • Week Evening: 0.75
  • Week Owl: 1.50
  • WeekEnd Morning and Evening: 1.25
  • WeekEnd OWL: 2.00
  • The weight for 1 day of on-call will be 1
  • One week of RFM is 10 shift credits.
  • First set of training shifts weight accounted as regular shifts.

Central shift work also counts as ESP work. 5 Shift credits are counted as 1 week of service work.

Training shifts to be taken BEFORE the start of the first block (contact shift manager to arrange). Additional retraining (if more than 4 weeks between shits) will not be credited. Minimum amount of shifts for various tasks is:

  • DQM (P5) 16 shifts
  • DCS 21 shifts
  • DAQ 32 shifts
  • Shift leader 21 shifts
  • Trigger 21 shifts
  • Computing: 7 shifts
  • DQM (Offline) 14 shifts

New for 2011: In order to enforce that we have a competent crew we will encourage shifters to take the required quota of shifts, see above. In order to enforce this we are instituting a police in which you only get 50% of the shift credit until you reach the quota for the year. In addition only shifters that are known to the shift list tools will be able to sign up for shifts. The shift managers for the different shifts will be adding shifters to the shift list tool.

Competences needed for the various central shifts

Run field manager: invited personally by run coordinator

Shift Leader: certain level of seniority and experience (e.g. postdoc who has been involved in construction/integration of CMS subdetectors, senior physicist with extensive running experience at other accelerators). It is the person who acts as interface to outside world and has responsibility for the safety of personnel and for the detector safety( shared with the Detector safety shifter) . Training: consult SL twiki instructions and 1-2 training shifts shadowing another shifter. Shift managers: A. Ryd, M. Chamizo

DAQ: anyone acquainted with modern programming technologies and Web based services. Dedicated training seminars and several training shifts Shift manager: V. O’dell, https://twiki.cern.ch/twiki/bin/viewauth/CMS/ShiftPourNuls

Trigger: anyone with some interest in trigger logic and acquainted with web based services. Training sessions and two training shifts. Shift manager: Manfred Jeitler, https://twiki.cern.ch/twiki/bin/viewauth/CMS/TriggerShifterGuide

Detector safety: people with detector development/integration and slow control experience preferred, even though one can also accept motivated young people. Regular training sessions (every Wednesday morning 9-11) and 2 training shifts. Shift manager: Etiennette Auffray https://twiki.cern.ch/twiki/bin/viewauth/CMS/OnlineWBCentralDCSInstructions

DQM at P5: anyone with analysis experience (preferably not only MC based!), people with global run experience and/or detector performance assessment experience appreciated. New shifters are requested to sign up for blocks B or D+ E first. Tutorial session + 1 training shift mandatory, instructions at https://twiki.cern.ch/twiki/bin/view/CMS/DQMShiftInstructions Shift managers: Amita Raval

BRM: Contact David Stickland for information.

ORM: Contact Lucia Silvestris for information.

Technical Coordination (165000): Contact Austin Ball

Offline DQM shifts

Basic Shift Rules and Policies

  • New shift persons are requested to sign up for their first shifts in a day time slot.
    The first shift must be preceeded by
    1. the DQM shift tutorial (Mondays 2pm) (possibly in the same week of the first shift or on the Monday of the week before).
    2. one training shift (possibly in the same week of the first shift and in any cases no more than two weeks in advance)

Shift blocks

  • 4 daily time slots of 6 hours each: 07-13 (CERN) , 13-19 (DESY) , 19-01 (FNAL) , 01-07 (FNAL) - all times given in Geneva time.
  • Select shifts in blocks of 4 or 3 starting Mondays and Fridays resp. Note: CERN rules do allow to do 7 shifts of 6 hours each in a row.
  • Standard central shift rules and credits apply (see above), the credit points are scaled by 6/8 reflecting the reduced number of hours. All offline shifts are daytime, with corresponding crediting.
  • Each offline DQM shift person should target to do at least 24 points (at least 8 local at Ip5 and at least 16 remote). The minimum of 8 points in DQM shifts at P5 should be acquired before doing offline shifts, pending availability of shift slots at P5.

Instructions for using the shift list tool

  • Go to the Shift List web interface
  • Log in with your AFS password (Login button on upper right)
  • In case you are not already in the shiftlist menu, click on "shiftlist" link on the left
  • Click on "Shift Selection" tab
  • Select the type of shift you want to sign up for ("DQM - Offline").
    Note: disregard "Supervision" and "System Operation" unless you know what these are wink
  • Click the "show" button to update the view
  • Use the green buttons to select the shift time slots (CERN: 7am-1pm, DESY: 1pm-7pm, FNAL: night 7pm-7am)
    note: by selecting one of the shift slots, you will sign up for the whole block
  • Make sure your selection is correct and you are able to cover all selected time slots.
  • Dont forget to click the save button.
  • Please send a short notification email including your dates of availability to amita.raval and virginia.azzolini (all AT cern.ch)

Shift schedules:

Other Reading:

Offline computing shifts

Types of Shifts

CMS has one central computing shift and one on-call

  1. The Computing Shift Person (CSP)
  2. The Computing Run Coordinator (CRC)

The CSP is central shift taken from one of the CMS Centers. There are 3 CSP shifts per day (8AM - 16:00 CERN time) (16:00 - 24:00) (24:00 to 8AM). CMS encourages shifters to take the slot that aligns with the day in their time zone. Computing does not enforce a block schedule, but the CERN safety rules regarding how many consecutive can be taken are enforced, and shifters are encouraged to take several consecutive days.

The CRC is an on-call service taken for the period of 1 week, currently Wednesday to Wednesday, and must be resident at CERN during commissioning or data taking conditions.

The CMS Shift list is the authoritative list in use for all computing shifts regardless of the timezone or location.

Qualifications of Shifters

CSP shifters can be anyone with basic computing skills and limited experience using the distributed computing system. CSP shifters are asked to attend one of the regular offered shift tutorials and to train one shift with an experienced CSP.

CRC shifters are required to be experts in the CMS distributed computing systems. They need to be able to help with diagnosis and problem resolution for a number of sites and services.

Weight of Shifts

CRC shifts are counted 1 shift point per on-call day

CSP Shifters are awarded 0.75 points per weekday and 1.25 points per weekend shift.

Subdetector on-call

One on-call credit per day will be allocated to each subsystem. The administration, training, and other requirements is the responsibility of the subsystems.


Q1:How many central shifts do my group need to take in 2010?

A1:This is listed on the page: http://cmsdoc.cern.ch/cms/performance/shiftdutyperinstitute.pdf

Q2:If my shift is cancelled, will I still get the credit?

A2:Yes. (Only if there are major changes in the LHC program with several months notice we might reconsider this.)

Q3:If more shifts are taken by a group than what is required during the year, how is this credited?

A3:Either the credit can be transfered to the following year, or 5 shift credits can be counted as 1 week of ESP service work.

-- AndersRyd - 09-Nov-2010

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Topic revision: r2 - 2010-12-15 - KaoriMaeshima
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