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Distributed CG

Philippe SWARTVAGHER requested to merge pswartva/starpu:distributed-cg into master

Here is a distributed implementation of the Conjugate Gradient. It's based on the basic example already in StarPU examples/cg/cg.c, but distributes data among MPI processes and submits tasks taking into account MPI.

Any review is welcomed. :)

Background: I'm looking for an application memory-bound with communications overlapped by computations. The Conjugate Gradient seems to be a good candidate. Since I want communications, I'm not especially looking to optimize/reduce them.

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