Summit: The World’s Fastest Supercomputer


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Owning the world’s fastest supercomputer is a sign of national technological achievement. It says: we care about advancement! About innovation! And about furthering scientific investigations!

The United States has taken the shrink-wrap off Summit, its all-new $200 million supercomputer.

Summit is now the fastest supercomputer in America and the fastest supercomputer in the world, toppling¹ China’s ‘Sunway TaihuLight‘ system from the apex of petaflop achievement.

But it gets even better.

Summit runs on Linux.
Specifically, it runs on Red Hat Enterprise Linux (RHEL).

summit-supercomputer

But the United States has had to work hard to reclaim the ‘speediest computer on earth’ title from China and its Sunway TaihuLight system.

The US Department of Energy (DoE) teamed up with iconic computing company IBM and graphics powerhouse Nvidia to design a machine capable of beating the best on record, and setting an impressive new benchmark.

And what a rival they created: Summit is twice the speed of China’s Sunway.

Nvidia’s Paresh Kharya, product management and marketing director for accelerated computing at the graphics company, points out that Summit is not just “the most powerful and the smartest supercomputer in the world” but that it is “also the world’s largest GPU-accelerated supercomputer.”

Beneath the bonnet of the behemoth sit a series of IBM Power 9 CPUs paired with Nvidia Tesla Core GPUs — a collective connection that sees the computer consume a colossal 13MW of energy when running at full clout.

  • Summit is made up of 4,608 compute nodes
  • Each node is made up of:
    • 2x 22-core IBM POWER9 CPUs
    • 6x NVIDIA Tesla V100 accelerators
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If you crunch the numbers on those stats you’ll learn that Summit’s overall CPU, core and GPU count stands thus:

  • 9,216 IBM POWER9 CPUs
  • 202,752 POWER9 cores
  • 27,648 NVIDIA Volta GPUs

Summit also has 10 petabytes of memory and 250 petabytes of storage. Oh, and those internal NVIDIA GPUs? They communicate with the IBM CPUs over a Nvidia NVLink interconnect, which has throughput speeds of 300GB/s — a colossal 10x faster than PCIe.

Summit vs Titan

How fast is fast when fast just keeps getting faster? Heck, I’d need a supercomputer of my own to try to answer that!

But I can parrot some impressive sounding stats about Summit.

Prior to Summit America’s fastest supercomputer was ‘Titan’, which boasts a peak performance of 27 petaflops.

That figure is smashed, stamped on, reformed, and they smashed again by Summit, which boasts a peak performance of 200 petaflops (or 200,000 trillion calculations per second for those of you counting).

PerformanceTitan (former US #1)Summit (new #1)
Node Performance1.44 teraflops49 teraflops
Peak Performance27 petaflops200 petaflops

To put just-how-freaking-fast Summit is into some sort of perspective consider this: Summit can number crunch in 1 minute a task that a desktop PC would take 30 years to complete!

A task that would take a desktop PC 30 years to complete can be done in 1 minute using Summit

Although it has yet to confirm for the US Department of Energy, I’m led to believe that Summit is now the only computer on earth that’s fast enough to run the Linux port of Tomb Raider: 20 Year Celebration on max settings atop full-fat Ubuntu with the GNOME Shell memory leak un-patched.

America plans to build the world’s first exaflop supercomputer by 2021

But the US Department of Energy isn’t content to stop here. It has greater ambitions, of which Summit is not the peak. It plans to build a number of exaflops (1,000 petaflops) machines.

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And Energy secretary Rick Perry is bullish on the timescale. He says America will deliver the first exaflop supercomputer by 2021.

What is the Summit Supercomputer for?

As impressive and grand as supercomputers sound on paper it’s important to remember that they’re built for a purpose. They stand at the forefront of modern technology and cutting-edge science.

From artificial intelligence and machine learning to simulating climate models and helping create new materials, machines like Summit are key to unlocking advances in computing, medicine, energy and our place in the universe.

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Further details

More details on Summit can be found on the ORNL.gov website. If you’re interested in the deeply technical side to do check out the detailed blog-post Nvidia has put out on their blog: NVIDIA Blog Post on the Summit Supercomputer


  1. Technically the fastest. In the actual leaderboards compiled by Top500 Sunway will remain the fastest supercomputer until the rankings are updated to include Summit, which is expected in a few months time.

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