What Is Your Problem?

What are the answers you seek?

• Single number?
  • Data reduction
    • processor syncronization (wait for all PE's)

    • interprocessor communication

• Many single numbers?
  • Truly embarassingly parallel:
    Independent parameter-sweep runs
    • Entire problem fits on one node
      • Generalization: use only a few nodes per problem, to get high parallel efficiency.

    • If the parameter sweep is essential to the physics, than running all the cases is really running a single problem. Just think of it as a single program.

• Profiles in subset of dimensions?
  • Data reduction (see above)

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