Basic HTML version of Foils prepared August 7 98

Foil 24 Conjugate Gradient: Agglomeration

From DoD HPF Training -- 5. Parallel Programming in HPF DoD Training and Others -- 1995-98. by Chuck Koelbel -- Rice University
1 Dot products and convergence test always require global communication
  • No reason to pick one DISTRIBUTE over another
2 Vector updates require no communication
  • Really no reason to choose a particular DISTRIBUTE
3 Matrix-vector multiply does care where its data come from
  • In this case, same advantages/disadvantages as Jacobi iteration
4 The bottom line
  • (BLOCK,*) on high-latency machines or small problem sizes
  • (BLOCK,BLOCK) on low-latency machines
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