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Title: Evaluating the networking characteristics of the Cray XC-40 Intel Knights Landing-based Cori supercomputer at NERSC

Abstract

There are many potential issues associated with deploying the Intel Xeon Phi™ (code named Knights Landing [KNL]) manycore processor in a large-scale supercomputer. One in particular is the ability to fully utilize the high-speed communications network, given that the serial performance of a Xeon Phi TM core is a fraction of a Xeon®core. In this paper, we take a look at the trade-offs associated with allocating enough cores to fully utilize the Aries high-speed network versus cores dedicated to computation, e.g., the trade-off between MPI and OpenMP. In addition, we evaluate new features of Cray MPI in support of KNL, such as internode optimizations. We also evaluate one-sided programming models such as Unified Parallel C. We quantify the impact of the above trade-offs and features using a suite of National Energy Research Scientific Computing Center applications.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Cray Inc, Bloomington, MN (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1398460
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Journal Name: Concurrency and Computation. Practice and Experience
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; high-performance computing; high-speed interconnects; Knights Landing; MPI; performance analysis; UPC

Citation Formats

Doerfler, Douglas, Austin, Brian, Cook, Brandon, Deslippe, Jack, Kandalla, Krishna, and Mendygral, Peter. Evaluating the networking characteristics of the Cray XC-40 Intel Knights Landing-based Cori supercomputer at NERSC. United States: N. p., 2017. Web. doi:10.1002/cpe.4297.
Doerfler, Douglas, Austin, Brian, Cook, Brandon, Deslippe, Jack, Kandalla, Krishna, & Mendygral, Peter. Evaluating the networking characteristics of the Cray XC-40 Intel Knights Landing-based Cori supercomputer at NERSC. United States. doi:10.1002/cpe.4297.
Doerfler, Douglas, Austin, Brian, Cook, Brandon, Deslippe, Jack, Kandalla, Krishna, and Mendygral, Peter. Tue . "Evaluating the networking characteristics of the Cray XC-40 Intel Knights Landing-based Cori supercomputer at NERSC". United States. doi:10.1002/cpe.4297.
@article{osti_1398460,
title = {Evaluating the networking characteristics of the Cray XC-40 Intel Knights Landing-based Cori supercomputer at NERSC},
author = {Doerfler, Douglas and Austin, Brian and Cook, Brandon and Deslippe, Jack and Kandalla, Krishna and Mendygral, Peter},
abstractNote = {There are many potential issues associated with deploying the Intel Xeon Phi™ (code named Knights Landing [KNL]) manycore processor in a large-scale supercomputer. One in particular is the ability to fully utilize the high-speed communications network, given that the serial performance of a Xeon Phi TM core is a fraction of a Xeon®core. In this paper, we take a look at the trade-offs associated with allocating enough cores to fully utilize the Aries high-speed network versus cores dedicated to computation, e.g., the trade-off between MPI and OpenMP. In addition, we evaluate new features of Cray MPI in support of KNL, such as internode optimizations. We also evaluate one-sided programming models such as Unified Parallel C. We quantify the impact of the above trade-offs and features using a suite of National Energy Research Scientific Computing Center applications.},
doi = {10.1002/cpe.4297},
journal = {Concurrency and Computation. Practice and Experience},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 12 00:00:00 EDT 2017},
month = {Tue Sep 12 00:00:00 EDT 2017}
}

Conference:
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