YML is a dedicated framework to develop and run parallel applications over a large scale middleware. This framework makes eas- ier the use of a grid and provides a high level programming tool. It is independent from middlewares and users are not in charge to manage communications. In consequence, it introduces a new level of commu- nications and it generates an overhead. In this paper, we proposed to showed the overhead of YML is tolerable in comparison to a direct use of a middleware. This is based on a matrix inversion method and a large scale platform, Grid'5000.