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Experimental Studies

1. Design experiment
   • Identify data you wish to obtain.
   • Measure data for different problem sizes and/or processor numbers;
   • Be sure that you measure what you intend to measure.
2. Obtain and validate experimental data
   • Repeat experiments to verify reproducability of results.
   • Variation by nondeterministic algorithms, inaccurate timers, startup costs, interference from other programs, contention, ...
3. Fit data to analytic models.

   For instance, measure communication time and use scaled least-square fitting to determine startup and data transfer costs.