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STARPU_MPI_REDUX starpu_data_access_mode to only redux between MPI and not within nodes

Antoine Jego requested to merge feature-starpu_mpi_redux into master

This allows to perform a reduction between processes (typically inter-node) but not within workers of multiple nodes (no intra-node reduction). This is required when the data is huge, and we do not want to replicate as many times as there are workers, but only as many times as there are MPI processes.

Edited by THIBAULT Samuel

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