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C++ and the Higgs 17 years of Bjarne in High Energy Physics

C++ and the Higgs 17 years of Bjarne in High Energy Physics. Festschrift for Bjarne Stroustrup Ren é Brun, Axel Naumann/CERN Geneva. The HEP Context. High Energy Physics: “ what is mass ” , “ why is the universe so heavy ” , “ now show me that Higgs ! ”

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C++ and the Higgs 17 years of Bjarne in High Energy Physics

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  1. C++ and the Higgs17 years of Bjarne in High Energy Physics Festschrift for Bjarne Stroustrup René Brun, Axel Naumann/CERN Geneva

  2. The HEP Context • High Energy Physics:“what is mass”, “why is the universe so heavy”, “now show me that Higgs!” • CERN: international lab in Geneva / Switzerland, with 10’000 users • Large Hadron Collider (LHC) with 4 major experiments provides highest energy LHC simulation LHC approval LHC start LHC End???

  3. LHCLarge Hadron Collider Mont Blanc Geneva lake Jura 28 km ring

  4. C++ in HEP • C++ has 20’000 HEP users • 50 MLOC C++ at CERN • All experiments rely on C++ • The 4 LHC experiments have today more than 100 Petabytes of data in the form of C++ objects managed by the ROOT software.

  5. The Consumer Age • HEP used FORTRAN. Everywhere. • Does it scale to 10’000 users? Future? Educating students? And that OO thing... • Bjarne helped right at the start in 1995, e.g. with ROOT (CERN’s data analysis tool) • Shared his expertise, encouraged us

  6. The Expert Age • Importance of C++ in HEP grew • Bjarne’s visits transformed from consulting to main attraction • C++ forced to be self-sustained at CERN • Success: novices + expertsall work on the same code!

  7. The Contributor Age • Slowly realizing (also thanks to Bjarne!) that our experience is relevant • Contribute with software, e.g. ROOT: insurances, banking, aerospace... • Contribute to software, e.g. GCC • Contribute to C++: Fermilab / Chicago @ C++ standards committee

  8. Summary • Hard to imagine CERN or HEP withoutC++ • Bjarne continues to be a fantastic mentor • Whatever we find at CERN: Bjarne has contributed his share!

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