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BLACS

• Basic Linear Algebra Communication Subprograms communicate parts of
  • rectangular matrices,
  • trapezoidal matrices
• Processes are laid out on a 2D logical mesh
• Processes are referenced by location in topology
• Blocking point-to-point communication
• Collective communication over row, column or all of topology
  • broadcast
  • some reduction routines
• No message tags
• BLACS context is compatible with MPI communicator