Robert E. Walkup

TL;DR: The scalability issue for MPI performance analysis on Blue Gene/L, the world's fastest supercomputing platform, is discussed and an experimental study of existing MPi performance tools that were ported to BG/L from other platforms are presented.

TL;DR: In this paper, a general computer-implement method and apparatus to optimize problem layout on a massively parallel supercomputer is described, which takes as input the communication matrix of an arbitrary problem in the form of an array whose entries C(i, j) are the amount to data communicated from domain i to domain j. Given C( i, j), first implement a heuristic map is implemented which attempts sequentially to map a domain and its communications neighbors either to the same supercomputer node or to near-neighbor nodes on the supercomputer torus while keeping the

TL;DR: In this article, the role of the substrate in the quenching of the Franck-Condon transitions to repulsive excited states has been discussed, and a simple positive-ion desorption mechanism has been identified based on the reversal of the Madelung potential, following multiple ionization of a negative ion in the crystal.

TL;DR: The ibm® Blue Gene®/q (bg/q) supercomputer system was developed in partnership between ibm, the Argonne National Laboratory, and the Lawrence Livermore National Laboratory as mentioned in this paper.