A simple code that compares the bandwidth using a shared memory MPI and point-to-point communication technique. It uses a task based parallel approach where ranks are coloured each representing a task. This is for now limited to two colours only (See CTaskDivider.hpp).
In main.cpp you can specify how to distribute the ranks among the two colours. Now it is set to initList = {size-1, 1}, i.e. one rank for colour 1 and the rest ranks size-1 are designated colour 0.
Build by mpic++ -std=c++17 -O2 main.cpp -a main.x.
Run by mpirun -np X ./main.x where X is the number of ranks.
Program will write two files, namely the average communication time.
bandwidth_p2p.out: Bandwidth Analysis for point-to-point communicationbandwidth_shm.out: Bandwidth Analysis for Shared memory communication