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Graham Allison Profile picture
@GrahamTAllison
Jun 26 • 6 tweets • 1 min read • Read on X
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1/ China Challenge: Believe It or Not*

Shaking Up the Supercomputer Rankings
2/ Which supercomputer was named the fastest in the world by the latest edition of the respected Top500 rankings?
3/ Answer: China’s LineShine system.
4/ LineShine is 20% faster than the No. 2 supercomputer, El Capitan, based at the US’s Lawrence Livermore National Laboratory.
5/ LineShine is built entirely with components made in China, from chips designed by Huawei to an operating system developed by researchers at the National University of Defense Technology. As The Wall Street Journal emphasizes (quoting from LineShine’s creators): “LineShine’s success ‘marks a historic step forward for China’s supercomputing industry in building an independent hardware and software ecosystem despite foreign technology restrictions.’”

wsj.com/tech/ai/chines…
6/ *As part of an effort to improve our understanding of China, I will continue to offer another “Believe It or Not” about China each week. Readers are invited to send along candidates for the list.

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More from @GrahamTAllison

Graham Allison Profile picture
Jun 22
1/ While at the Versailles Palace outside Paris last Wednesday for dinner with President Macron during which he signed a peace agreement with Iran, President Trump and his advisors were likely not thinking about the history of the location and palace in which they were sitting. Image
2/ Had they asked an applied historian, they might have been reminded of previous capitulations as well as declarations of victory.
3/ Who celebrated victory at Versailles?

Kaiser Wilhelm when he proclaimed the German Empire in 1871 after the Prussian army’s humiliating defeat of France. Image
Read 5 tweets
Graham Allison Profile picture
Jun 2
1/ What did Canada’s Prime Minister @MarkJCarney discuss with Xi Jinping when they met in Beijing?
2/ In his remarks to the Economic Club of New York (@EconClubNY) last week, Carney answered: Thucydides’s Trap.
3/ Caught between a rapidly rising power like China and a colossal ruling power like the US, middle powers like Canada need thoughtful, courageous, and agile leaders like Carney to chart a path through the turbulence.
Read 4 tweets
Graham Allison Profile picture
May 28
1/ Harvard Kennedy School 2026 graduates include a Medal of Honor recipient: Patrick Payne. Image
2/ Harvard Commencement is always a festival of distinctions. For me, today’s awarding of a degree to a Kennedy School graduate who has the rare distinction of having received a Medal of Honor is a first.
3/ Harvard is proud to have had more graduates who received Medals of Honor than any educational institution other than West Point and the Naval Academy.
Read 5 tweets
Graham Allison Profile picture
May 25
1/ As we fire up our grills for Memorial Day and look forward to July 4th when we will celebrate the 250th birthday of this nation, we should all pause and reflect.
2/ What do we the living owe those who gave their utmost to secure the freedom that we enjoy every day?

Freedom that we have become so accustomed to that most of us essentially take it for granted.

As one of my great mentors Henry Kissinger frequently noted, too many Americans imagine that “peace is the natural condition of mankind.”

In fact, as the bumper sticker version reminds us: “freedom is not free.”
3/ This is a topic I’ve wrestled with for most of my professional career.

As I prepare to pause for the “national moment of silence” at 3:00 PM on Memorial Day, I will reflect on ideas that I tried to communicate in the articles linked below.
Read 9 tweets
Graham Allison Profile picture
May 22
1/ Who missed Hormuz?
2/ When asked during a recent @60Minutes interview whether Israel anticipated that Iran might move to close the Strait of Hormuz, an uncharacteristically sheepish Bibi Netanyahu (@netanyahu) almost completely avoided eye contact with interviewer Major Garrett (@MajorCBS) — eventually conceding that “the problem of the Hormuz Strait was understood as the fighting went on.”
3/ When asked about whether the US anticipated Iran would close the strait and conduct strikes on its neighbors, Secretary of War Pete Hegseth (@PeteHegseth) responded: “I can’t say we anticipated necessarily that’s exactly how they would react.”
Read 10 tweets
Graham Allison Profile picture
May 18
1/ Wonders to be thankful for.
2/ One of the wonders of teaching at Harvard is that each year, a new crop of remarkable students shows up full of aspirations to make the world a better place. And indeed, some actually do.
3/ My course “Central Challenges of American National Security, Strategy, and the Press” is designed primarily for grad students at HKS, plus a select number from the Business and Law Schools. But we also take 10 undergraduates each year.
Read 4 tweets

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