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Pre-exascale accelerated application development: The ORNL Summit experience

Journal Article · · IBM Journal of Research and Development
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  1. IBM Research, Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Groningen (The Netherlands)
  4. Univ. Rovira i Virgili, Tarragona (Spain)
  5. Univ. of Southern Denmark, Odense (Denmark)
  6. Nvidia Corporation, Oak Ridge, TN (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. Georgia Inst. of Technology, Atlanta, GA (United States)
  9. Univ. of Amsterdam (Netherlands)
+ Show Author Affiliations

High-performance computing (HPC) increasingly relies on heterogeneous architectures to achieve higher performance. In the Oak Ridge Leadership Facility (OLCF), Oak Ridge, TN, USA, this trend continues as its latest supercomputer, Summit, entered production in early 2019. The combination of IBM POWER9 CPU and NVIDIA V100 GPU, along with a fast NVLink2 interconnect and other latest technologies, pushes system performance to a new height and breaks the exascale barrier by certain measures. Due to Summit's powerful GPUs and much higher GPU–CPU ratio, offloading to accelerators becomes a requirement for any application, which intends to effectively use the system. To facilitate navigating a complex landscape of competing heterogeneous architectures, a collection of applications from a wide spectrum of scientific domains is selected for early adoption on Summit. In this article, the experience and lessons learned are summarized, in the hope of providing useful guidance to address new programming challenges, such as scalability, performance portability, and software maintainability, for future application development efforts on heterogeneous HPC systems.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1649509
Journal Information:
IBM Journal of Research and Development, Journal Name: IBM Journal of Research and Development Journal Issue: 3/4 Vol. 64; ISSN 0018-8646
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

97 MATHEMATICS AND COMPUTING
GPU
High performance computing
accelerated computing