Hardware topology interface for communicationPolicy

[erikzenker]

A communication policy should provide the hardware topologie of its network as a graph. Thus, the communication graph can be mapped to the hardware graph. This issue is coupled a little bit with issue #21 since a communication graph with more vertices than available peers need to be partioned first to be mapped to the hardware graph as second step.

How can this hardware graph be retrieved ?

• By some communication benchmarks at initialization time
• By some user input
• By some network discovery tools (netloc, hwloc, lsnettopo, Libtopomap)
• By the existing communication library (MPI virtual topologies)

[erikzenker]

This job will hopefully be done by @slizzered and his wonderful hardware description library.