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In exascale, Japan stands apart with firm delivery plan

Patrick Thibodeau | Jan. 2, 2014
The U.S., Japan and other countries have only set a timeframe for delivering a next generation exascale system

Japan intends to deliver an exascale supercomputer in six years. The firm completion date makes Japan novel among the nations in the race to build exascale systems.

The Riken Advanced Institute for Computational Science in Kobe, Japan, already home to that nation's largest computer system, said last week it will lead Japan's exascale program, with "successful development of the exascale supercomputer scheduled for completion by 2020."

"We will devote our energy to this project," said Kimihiko Hirao, director of the Riken institute, in a statement. An exascale system "will be a great boon for science and technology, as well as industry," he said.

The U.S., meanwhile, is aiming for an "early 2020s" delivery of an exascale system , a Dept. of Energy official said during a presentation that coincided with the annual supercomputing conference, SC13, in November.

In December, Congress approved a fiscal 2014 defense budget bill that requires development of an exascale system within a 10-year period, or by 2024. This is an improvement over an earlier Senate defense funding bill that included a "20 year plan."

The Europeans are developing an ARM-based exascale system and have set a delivery goal of 2020. That goal, though, doesn't have the stake-in-the-ground clarity of Japan. China, which presently operates the world's fastest supercomputer according to the Top 500 rankings, is believed to be targeting 2018-2020 timeframe for exascale delivery, but has not yet made an official announcement.

An exascale system is capable of a quintillion, or a million trillion, floating point operations per second. It is approximately 1,000 faster than a single petaflop system. The fastest systems in use today are well under 50 petaflops.

Exascale development may be a race but no one has yet defined what will constitute a winner. Today, the fastest supercomputers are determined by their ranking on the Top 500 list. But if a nation deploys an exascale system that uses 100 MWs of power, and another nation deploys one two years later with technology that uses a third as much power, which nation has won?

It now costs about $1 million a year to run a 1 megawatt system, and current supercomputers are already in the range of 10 megawatts. There are numerous technical challenges to reduce those power requirements.

For instance, memory is a major challenge for exascale developers. DRAM memory is too slow and expensive to support exascale, but scientists aren't sure yet what will replace it.

Along with the race to deliver exascale, another technology competition is taking shape: quantum computing.

The U.K. last month said it is investing $444 million in quantum computing over the next five years. The money will fund a network of quantum computing centers.


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