Bio
James B White III (Trey) is a performance engineer who strives to enable and accelerate science breakthroughs on advanced computers in the National Center for Computational Sciences. He has decades of experience in high-performance computing across a broad range of applications and technologies.
Professional Experience
Oak Ridge National Laboratory
Distinguished Research Scientist, Jan 2024 - present
Hewlett Packard Enterprise
Master Engineer, Jan 2019 - Jan 2024
Bionano
Senior Staff Software Engineer (HPC), Nov 2015 - Dec 2018
Children's Hospital Los Angeles
Applications Architect, Aug - Nov 2015
DreamWorks Animation
Senior Software Engineer, Apr 2012 - Aug 2015
National Center for Atmospheric Research
Senior Software Engineer, Jun 2010 - Apr 2012
Oak Ridge National Laboratory
Senior Research Computer Scientist, Mar 1999 - Jun 2010
Ohio Supercomputer Center
Computational Scientist, 1997 - 1999
Education
University of Tennessee, Knoxville
PhD in Computer Science, 2011
Dissertation: "Algorithms for Advection on Hybrid Parallel Computers"
Advisor: Jack Dongarra
The Ohio State University
MS in Physics, 1996
Rhodes College
BS in Physics with Honors, 1992
Professional Service
Performance, Portability, & Productivity in HPC
Program Committee, 2020-present
University of the People
Online Adjunct Instructor, 2017-2019
League of Amazing Programmers
Volunteer Teacher, 2016-2017
Robot Competition Team Mentor, 2016
SC Conference Series
Tutorials Committee, 2001-2002, 2006, 2011-2014
Chair of HPC Software Challenge, 2004
Technical-Papers Committee, 2003
AV Chair, 2000
International Journal of HPC Applications
Subject-Area Editor, 2010-2012
Oak Ridge Leadership Computing Facility
User Council, 2010-2012
Swiss National Supercomputing Centre
Scientific Reviewer, 2009-2012
Cray User Group
Local Arrangements Chair, 2004, 2009
Board of Directors, 2004-2007
IBM HPC Systems Scientific Computing User Group
Program Committee, 2006
Founding Member, 1999
HPE ForCAST
then the Compaq Alpha Scientific and Technical User Group
Founding Member, 2000
Professional Affiliations
ACM SigHPC
2016-2018, 2023-present
Publications
View AllOther Publications
2024
Performance Versus Maintainability: A Case Study of Scream on Frontier
2023
Performance Portability of Programming Strategies for Nearest-Neighbor Communication with GPU-Aware MPI
The Simple Cloud-Resolving E3SM Atmosphere Model Running on the Frontier Exascale System
Experiences Readying Applications for Exascale
Exploring Fully Offloaded GPU Stream-Aware Message Passing
Designing HPE Cray Message Passing Toolkit Software Stack for HPE Cray EX supercomputers (paper) (slides)
Application Profiling (slides) (video)
2022
Exploring GPU Stream-Aware Message Passing using Triggered Operations
Debugging and Performance Profiling for Frontier (video)
2020
A Comparison of GPU Programming Models (slides) (video)
2012
Relative Outcomes of Climate Change Mitigation Related to Global Temperature Versus Sea-Level Rise
Climate System Response to External Forcings and Climate Change Projections in CCSM4
A Modern Solver Interface to Manage Solution Algorithms in the Community Earth System Model
2011
High-Performance High-Resolution Semi-Lagrangian Tracer Transport on a Sphere
Overlapping Computation and Communication for Advection on Hybrid Parallel Computers
Multiwavelet Discontinuous Galerkin-Accelerated Exact Linear Part (ELP) Method for the Shallow-Water Equations on the Cubed Sphere
2009
A Scalable and Adaptable Solution Framework within Components of the Community Climate System Model
Time Acceleration Methods for Advection on the Cubed Sphere
2008
Acceleration of Time Integration
2007
Software Design for Petascale Climate Science
Scientific Application Requirements for Leadership Computing at the Exascale
It’s About Time: Multi-Resolution Timers for Scalable Performance Debugging
2006
Comparing Optimizations of GTC for the Cray X1E and XT3
2005
Systematic Study of d-Wave Superconductivity in the 2D Repulsive Hubbard Model
Vectorizing the Community Land Model
Practical Performance Portability in the Parallel Ocean Program (POP)
Performance Evaluation of the Cray X1 Distributed Shared-Memory Architecture
2004
Adventures in Vectorizing the Community Land Model
Dangerously Clever X1 Application Tricks
Towards Full Simulations of High-Temperature Superconductors
ORNL Cray X1 Evaluation Status Report
2003
Early Evaluation of the Cray X1
An Optimization Experiment with the Community Land Model on the Cray X1
DOE Ultrascale Evaluation Plan of the Cray X1
2002
Early Evaluation of the IBM p690
1999
Where's the Overlap? An Analysis of Popular MPI Implementations
1997
On Improving the Performance of Sparse Matrix-Vector Multiplication
Performance Issues of Scientific Programming in Ada 95