  We report scaling results on the world's largest supercomputer of our
recently developed Billions-Body Molecular Dynamics (BBMD) package, which was
especially designed for massively parallel simulations of the atomic dynamics
in structural glasses and amorphous materials. The code was able to scale up to
72 racks of an IBM BlueGene/P, with a measured 89% efficiency for a system with
100 billion particles. The code speed, with less than 0.14 seconds per
iteration in the case of 1 billion particles, paves the way to the study of
billion-body structural glasses with a resolution increase of two orders of
magnitude with respect to the largest simulation ever reported. We demonstrate
the effectiveness of our code by studying the liquid-glass transition of an
exceptionally large system made by a binary mixture of 1 billion particles.
