Outline. The world map of big data tools. Layered architecture. Big data tools for HPC and supercomputing. MPI. Big data tools on clouds. MapReduce model Tutorial on what is the air-fuel mixture, stoichiometric ratio and its influence on the performance of an internal combustion engine. Menu. Mathematics and Science. Pregel : A System for Large-Scale Graph Processing. Presented by Dylan Davis Authors: Grzegorz Malewicz , Matthew H. Austern , Aart J.C. Bik, James C. Dehnert , Ilan Horn, Naty Leiser , Grzegorz Czajkowski (GOOGLE, INC.). Overview. What is a graph? Graph Problems Slideshow 2370024 by deanna Writing a Pregel program involves subclassing the prede- ned Vertex class (see Figure 3). Its template arguments de ne three value types, associated with vertices, edges, and messages. Each vertex has an associated value of the speci ed type. This uniformity may seem restrictive, but users can manage it by using exible types like protocol bu ers .