---
title: Node-Aware Stencil Communication for Heterogeneous Supercomputers
event: C3SR Bi-weekly Technical Seminar
event_url:

location: Coordinated Science Lab 216
address:
  street: 1308 W Main St
  city: Urbana
  region: IL
  postcode: '61801'
  country: United States

summary: Optimizing Multi-GPU Stencil Communication
abstract: "High-performance distributed computing systems increasingly feature nodes that have multiple CPU sockets and multiple GPUs. The communication bandwidth between these components is non-uniform. Furthermore, these systems can expose different communication capabilities between these components. For communication-heavy applications, optimally using these capabilities is challenging and essential for performance.

This work presents approaches for automatic data placement and communication implementation for 3D stencil codes on multi-GPU nodes with non-homogeneous communication performance and capabilities. Benchmarking results in the Summit system show that choices in placement can result in a 20% improvements in single-node exchange, and communication specialization can yield a further 6x improvement in exchange time in a single node, and a 16% improvement at 1536 GPUs."

# Talk start and end times.
#   End time can optionally be hidden by prefixing the line with `#`.
date: "2020-02-28T14:00:00Z"
date_end: "2020-02-28T15:00:00Z"
all_day: false

# Schedule page publish date (NOT talk date).
publishDate: "2020-03-08T00:00:00Z"

authors: ["Carl Pearson"]
tags: []

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featured: true

image:
  caption: 'Image credit: [**Unsplash**](https://unsplash.com/photos/bzdhc5b3Bxs)'
  focal_point: Right

links:
url_code: ""
url_pdf: ""
url_slides: "pdf/20200228_c3sr_stencil.pdf"
url_video: ""

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---