Basic HTML version of Foils prepared August 7 98

Foil 31 Irregular Mesh: Agglomeration II

From DoD HPF Training -- 5. Parallel Programming in HPF DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University


1 Warning: Your compiler may do things differently!
2 Computation is static, homogeneous, and over full array (with respect to the edges)
  • No load balancing issues
3 Accesses to node array are ³nearest neighbor² in the mesh
  • This is not reflected in the index order!
  • \ This does not favor either BLOCK or CYCLIC
4 To minimize communication, edge and node distributions must fit the mesh topology
  • HPF¹s regular distributions are not ideal for this
  • HPF 2.0 indirect distributions may be better, but require careful construction
5 The bottom line, part II
  • No silver bullet
  • Order the nodes and edges to bring ³close² entities together, then use BLOCK

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