SCHEDULE: NOV 12-18, 2011

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ENTIRE WEEK SATURDAY SUNDAY MONDAY TUESDAY WEDNESDAY THURSDAY FRIDAY

Fast One-Sided Communication on Supercomputers and Application to Three Scientific Codes

SESSION: Research Poster Reception

EVENT TYPE: ACM Student Research Competition Poster, Poster, Electronic Poster

TIME: 5:15PM - 7:00PM

SESSION CHAIR: Bernd Mohr

AUTHOR(S):Jeff R. Hammond, Sreeram Potluri, Zheng (Cynthia) Gu, Alex Dickson, James Dinan, Ivo Kabadshow, Pavan Balaji, Vinod Tipparaju

ROOM:WSCC North Galleria 2nd/3rd Floors

ABSTRACT:
We have developed a new library for one-sided communication and applied it to three different scientific codes: the NWChem computational chemistry application, the ScaFaCoS (Scalable Fast Coulomb Solvers) library, and the NEUS (non-equilibrium umbrella sampling) application. All three codes rely upon asynchronous communication, such as one-sided put, get, accumulate and remote atomics (e.g. fetch-and-add). Our library was designed to meet the requirements of current and next-generation interconnects found in Blue Gene/P and Q, PERCS and Cray XE architectures, such as dynamic routing, DMA engines and hardware remote atomics. The synchronization semantics and implementation have been designed for scalability to more than one million ranks. We demonstrate the scaling of all three applications to thousands of cores. As a scaling exemplar, the fast multiple method (FMM) in ScaFaCoS is demonstrated to scale to 300K ranks of Jugene, which is impossible with MPI and ARMCI for both semantic and implementation reasons.

Chair/Author Details:

Bernd Mohr (Chair) - Juelich Supercomputing Centre

Jeff R. Hammond - Argonne National Laboratory

Sreeram Potluri - Ohio State University

Zheng (Cynthia) Gu - Florida State University

Alex Dickson - University of Chicago

James Dinan - Argonne National Laboratory

Ivo Kabadshow - Juelich Supercomputing Centre

Pavan Balaji - Argonne National Laboratory

Vinod Tipparaju - Oak Ridge National Laboratory

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