Live data from Hacker News

First true exascale supercomputer?

top500.org

51–60 of 72 posts

Re: First true exascale supercomputer?

#51

If they truly wanted to solve world problems, they need to allow an AGI company like DeepMind or OpenAI to use it. The people now using it are likely wasting so much money using outdated technologies.

As in Vernor Vinge's "A Fire upon the Deep", where Powers in the Great Beyond transcend existence while regular people are condemned to live out their lives running a trivial program.

Re: First true exascale supercomputer?

#54

I remember in early 2000's trying to convince people to use linux and being mocked that it was a "toy" or "not professional enough". While at the time I tried to argue how it was more stable, more secure and better performant than competition and even arguing that it was improving continuously, some people still made fun of me. It is a good thing I've been able, for a long time, to see this: https://www.top500.org/st…

The writing has been on the wall since the early Beowulf success stories hit.

I'm pretty bullish on the long term survival of Linux in some form or other, proprietary OS's not so much.

Re: First true exascale supercomputer?

#55
post #49
post #43

Earlier quoted context omitted.

Are you kidding? You know a single widebody airliner uses more energy than that, right?

Widebody airliners aren't doing much for the climate, either.

While true, I think the point is more about how minuscule 21 MW is when considered in isolation — 0.001 percent of global electricity usage.

Re: First true exascale supercomputer?

#56

Earlier quoted context omitted.

HIP is basically CUDA with s/cuda/hip/g. My experience is that the stack is pretty rough around the edges. But when it works, you (almost) literally find-and-replace, and it pretty much works as advertised. However, just because you can get to a correct code doesn't necessarily mean that code will achieve optimal performance (without further tuning, of course).

Not only tuning the code, but also the bazillion knobs on the GPUs themselves.

That's the upside of a supercomputer though, fixed architecture to target with enough weight that it's worthwhile.

Re: First true exascale supercomputer?

#57
post #41

21 MW power! Insane. Interestingly, the second one is 30 MW.

This is the first I have noticed them reporting power draw. It seems immoral to run it for anything that doesn't help stop global climate catastrophe. (Presumably global thermonuclear war would suffice. But carbon capture afterward would be hard to arrange for.) Wondering if they measure while benchmarking, or add up max power ratings of the chips. Did any old mainframe ever burn like that? E.g. the first big USAF mi…

Using the secret skill of "clicking on the links for the other lists" I discovered that the first TOP500 which had a machine report a power draw was the TOP10 in November 1996: https://top500.org/lists/top500/1996/11/

(498 kW for 229 GFlops. 136,317 times more power draw per flops than the current leader on the Green500.)

Re: First true exascale supercomputer?

#58
post #26

21 MW power! Insane. Interestingly, the second one is 30 MW.

For reference, Roadrunner, which was the first petascale system in 2008, used 2.35 MW (according to Wikipedia). So this one gives us 1,000 times the performance for 10 times the energy. From a performance/Watt perspective, this is an impressive improvement. EDIT: Wikipedia also says Roadrunner was not considered power-efficient in its day, which led to it being decommissioned after only five years of operation.

That, and the apps teams hated the architecture given very poor tooling support - especially since the writing was on the wall that the future was GPGPU accelerators and the Cell was a dead end. The roadrunner processors were awesome on paper, but not so much when it came to working with them. Kind of a shame really: there were some really interesting ideas in that processor design.

Re: First true exascale supercomputer?

#59
post #16

There's a bit of drama in that there are unofficial reports of two systems in China with higher performance [0], the arXiv paper listed below talks about a 40 million core system with around double theoretical performance than Frontier, and there's apparently a second system online with similar performance. I personally suspect that they didn't submit benchmarks to the top500 simply because those don't run well enoug…

Let them build those machines and the f they are any good we can steal all their ideas. Turnabout is fair play.

Re: First true exascale supercomputer?

#60
post #2

It feels like it's been a long time since supercomputers were interesting. They're just oodles of identical processors connected together like legos. "We can afford more bricks than the next guy" is not exciting. When was the last time we had a "fastest supercomputer" that could do something the second-fastest couldn't also do?

Building the communication fabric it takes to make those oodles of identical processors to exchange and share data quickly so they don't get bogged down in their own communication overhead is a profoundly interesting problem, and by "profoundly interesting" I mean "call Richard Feynman in to help you solve it":

https://longnow.org/essays/richard-feynman-connection-machin...

Besides which, at that level the goal is not to go "look at this cool thing we built", it's more like "how do we cheaply and effectively build something that can solve these massive weather/nuclear explosion/human brain/etc. simulation problems we have?" and if ganging together lots of off-the-shelf CPUs/GPUs achieves that goal with less time, effort, and cost than building super-custom, boutique-schmoutique hardware, so be it.

Post reply on HN