03 - Communication Methods#
Description#
Compare custom MPI datatypes vs NumPy array communication for halo exchange operations. This experiment tests communication implementation details - how data is transferred between ranks during halo exchanges.
Custom MPI Datatypes: Zero-copy communication using MPI.Create_contiguous() and MPI.Create_subarray().
NumPy Arrays: Explicit buffer copies using np.ascontiguousarray().
Purpose#
Determine whether custom MPI datatypes provide measurable performance improvements over NumPy arrays by evaluating:
Communication overhead - Demonstrate whether custom datatypes reduce overhead compared to NumPy arrays
Scaling behavior - Analyze how each method scales with problem size and rank count
Scaling order analysis - Use log-log plots with reference lines to derive computational complexity
Communication Analysis: Contiguous vs Non-Contiguous
