In this white paper we describe work done on the development of an efficient iterative solver for lattice QCD based on the
Algebraic Multi-Grid approach (AMG) within the tmLQCD software suite. This development is aimed at modern computer
architectures that will be relevant for the Exa-scale regime, namely multicore processors together with the Intel Xeon Phi coprocessor.
Because of the complexity of this solver, implementation turned out to take a considerable effort. Fine tuning and
optimization will require more work and will be the subject of further investigation. However, the work presented here
provides a necessary initial step in this direction
