4. Distributed computing

These pages provide — and dissect — examples of workflows to be run on distributed resources with the DIRAC Interware system through iLCDirac, the extension developed by the Linear Collider community and used also by CALICE.

The procedure to be enabled to use the FCC resources through DIRAC is first described. Additional information about the use of iLCDirac can be found in the CLIC and ILC dedicated Wiki pages.

Unless specified, in the rest of this section the word DIRAC refers to the iLCDirac extension introduced above.

Contents:

• 4.1. Getting started with FCC distributed computing
  • 4.1.1. Registering to the FCC VO
  • 4.1.2. Enabling DIRAC
  • 4.1.3. Copying, browsing, accessing files
  • 4.1.4. The web portal
• 4.2. FCC DIRAC example workflows
  • 4.2.1. Overview of the submission scripts
    • 4.2.1.1. Before starting: cloning of workflows repository
  • 4.2.2. Workflow 1
    • 4.2.2.1. Purpose
    • 4.2.2.2. Output files
    • 4.2.2.3. DIRAC components involved
    • 4.2.2.4. The script, dissected
      • 4.2.2.4.1. The utility function
      • 4.2.2.4.2. Adding the --wms switch
      • 4.2.2.4.3. The DIRAC API instance
      • 4.2.2.4.4. The DIRAC Job manager
      • 4.2.2.4.5. The KKMC application instance
      • 4.2.2.4.6. The steering files for Delphes
      • 4.2.2.4.7. Completing the sandbox for Delphes
      • 4.2.2.4.8. Standalone Delphes using the DIRAC generic application
      • 4.2.2.4.9. Submitting the job to the chosen WMS
    • 4.2.2.5. Running the script on lxplus
      • 4.2.2.5.1. Local submission
      • 4.2.2.5.2. WMS submission
• 4.3. Structure for /eos/experiment/fcc/prod
  • 4.3.1. Overview