Before revision:  Results are presented demonstrating high per-node performance and near-ideal parallel scalability with rates of more than four quadrillion elementwise comparisons achieved per second  on the ORNL Titan system  .
After revision:  Results are presented demonstrating high per-node performance and near-ideal parallel scalability with rates of more than four quadrillion elementwise comparisons achieved per second on the ORNL Titan system , this being over 3,000X faster than rates using other codes and platforms as reported in the literature. Also it is estimated that as many as 90 quadrillion comparisons per second may be achievable on the upcoming ORNL Summit system, an additional 10X performance increase .