Outline

• Topologies

• Grids

• Subgrids

• Putting it all together - Implementation of Fox’s algorithm

• Dealing with i/o

  • Dealing with stdin, stdout, stderr
  • Attribute caching
  • Callback functions
  • Identifying the I/O process rank
  • Caching an I/O process rank
  • Retrieving the I/O process rank
  • Reading from stdin
  • Writing to stdout
  • Writing to stderr and error checking

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