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opinionated-days-three-four.md

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Possible topics for days 3+4

What is Gaudi and which problems does it solve?

  • A framework for event stream processing
  • Basic components: Algorithm, Tool
  • What is the TES?
  • How is Gaudi configured? -> Python options
  • What is CMake and how do I use it?
  • What is DaVinci and what does it add on top of Gaudi?
  • Hands-on
    • (I think we should teach screen on lx+ during days 1/2 so we can rely on it here)
    • Running DaVinci with a simple option file to print TES contents
      • We provide an MC file on public afs and hard-code the path into the options
    • How to read the output of Gaudi in case something goes wrong

My first DecayTreeTuple

  • How do I dump my data to a ROOT file? -> DecayTreeTuple
  • How do I need to change my options file (from before) to run DecayTreeTuple?
  • What is a TupleTool and how do I add one?
  • Hands-on
    • We can use the previous MC file and adjust the options file
    • Just run this locally on lx+ (just over a few events)
    • Look at the output with TBrowser

Working with the LHC grid

  • Why do we want to use the grid?
    • hands-on: Running a hello world job on the grid using the Dirac API
  • We don't need to use the Dirac API manually -> ganga
    • hands-on: Creating a hello world job with ganga
  • Running DaVinci on the grid using ganga
    • How to make set DaVinci as the application and configure it
    • How to use BKQuery
    • How to split your jobs (and decide how many files to use per job)
    • hands-on: Creating a "real" DecayTreeTuple using everything we've learned so far
  • What is EOS and how do I access it?
  • How do I grab some of those LFNs for local testing?
    • hands-on: using dirac-dms-getfile

The quick intro to stripping

  • What is a stripping line?
  • How do I look up the stripping selection for my line? -> stripping web page
  • How do I calculate the stripping efficiency using signal MC? -> TupleToolStripping
  • How do I extend a stripping line to build my candidates of choice and run it?

Trigger efficiencies using TISTOS

  • TisTos intro for users
  • TupleTools you can use
  • Interpreting the result
  • Possible caveats (Tis correlations, etc.)

Getting creative with LoKi functors

Swapping mass hypotheses

Running DecayTreeFitter

  • What does DecayTreeFitter do and why would I want to use it?
  • Repeating our previous tuple with a mass-constrained fit

How to apply multivariate tools in DecayTreeTuple

I have a problem, how do I debug it

  • Mailing lists
  • Finding out where your problem is
  • GaudiPython is your friend
  • Debug builds and gdb (this one might be too much)