Domain Decomposition and Message Passing

• Justification for choosing this paradigm
  • Generic
    • Message-passing calls small part of code

    • All message-passing libraries have same basic functions

  • Maximal data locality minimal communication

• 3D primary domain decomposition
  • 3D scalable to maximal #procs. (fixed problem size)

  • Decompose field grid arrays

  • Processors work on particles in their subdomains
    
    

  • Send particles leaving your subdomain to neighbor PEs

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