  Recent works try to optimise collective communication in grid systems
focusing mostly on the optimisation of communications among different clusters.
We believe that intra-cluster collective communications should also be
optimised, as a way to improve the overall efficiency and to allow the
construction of multi-level collective operations. Indeed, inside homogeneous
clusters, a simple optimisation approach rely on the comparison from different
implementation strategies, through their communication models. In this paper we
evaluate this approach, comparing different implementation strategies with
their predicted performances. As a result, we are able to choose the
communication strategy that better adapts to each network environment.
