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Moving Linux in CMS

Moving Linux in CMS. Vincenzo. Generic Certification backward compatibility. SLC4 is binary backward compatible: Binaries built on SLC3 are usable on SLC4 producing identical (bit by bit) results (same HW!) Binaries built on SLC4 with gcc323 compiler are usable on SLC3 with no regression

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Moving Linux in CMS

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  1. Moving Linuxin CMS Vincenzo

  2. Generic Certificationbackward compatibility • SLC4 is binary backward compatible: • Binaries built on SLC3 are usable on SLC4 producing identical (bit by bit) results (same HW!) • Binaries built on SLC4 with gcc323 compiler are usable on SLC3 with no regression • SLC4 is binary compatible with any SL4 and RHL4

  3. CMSSW certification1) compatibility • Compatibility running environment available since “ever” • CMS builds and ships all libraries needed by its applications including the compiler, python, libshift, valgrind setenv SCRAM_ARCH slc3_ia32_gcc323 scramv1 project CMSSW CMSSW_0_5_0 cd CMSSW_0_5_0/src eval `scramv1 runtime -csh` cmRun abc.cfg • Compatibility development environment available since last autumn setenv SCRAM_ARCH slc3_ia32_gcc323 scramv1 b cmRun abc.cfg (on sl4 or sl3)

  4. CMSW Certification2) port to gcc 3.4 • CMS has ported its development, building and local running environment to SL4 gcc 3.4 • Almost all physics software applications (simulation, reconstruction, calibration, analysis) has been ported to gcc3.4 • Missing few components mostly because of dependences from “unmaintained” externals • Nightly builds available since ~15/11/2006 • Official Release available since 20/12/2006 • Working on full regression validation • Expect to make slc4_ia32_gcc34 default in March

  5. Certification3) port to amd64 • At Present no firm plan for a port to native amd64 • First tests show regressions • Need to investigate implications on performance • Speed • Memory footprint • Will support compatibility mode (-m32)

  6. “Grid” Software:CMS specific components • Compatibility mode already exploited on WN • Compatibility mode in job preparation under test (prepare scl3_gcc323 job on SL4) • Job submission relies on lcg/UI: needs native scl3 • Work started to port CMS “grid” tools to native SL4 environment • Expected to be ready for March 1st • Job submission most probably will still require login on a scl3 lcg/UI

  7. Summary • IA32 • Physics Applications (CMSSW) • OK (few components missing) • Interactive environment (including IGUANA) • OK • Building environment (SCRAM, NICOS) • OK • Running environment (including GRID?) • OK local • Grid OK in compatibility mode • Data Management, Workflow Management • Compatibility mode under test • SL4 native: Migration Started • Native 64 bits • First investigation starting

  8. Background Material • Presentation at CMS Week March 2006 • SLC4 web home • wiki Feature List For SLC4 • LCG/AA Architect Forum (minutes) • La marche de l'empereur

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