Live data from Hacker News

Cray-1 vs Raspberry Pi

roylongbottom.org.uk

111–120 of 193 posts

Re: Cray-1 vs Raspberry Pi

#111
post #92

When I see comparisons like this, the first thought I have is not the benchmarks, but rather what the most “heroic” real-world calculation of the day would have been on something like the Cray-1, and how to replicate those calculations today on something like a RPi. Weather/climate models? Rad-hydro? The fidelity would almost certainly be super low compared to modern FEA software, but it would be a fun exercise to tr…

nuclear weapons simulations the first machine went to Los Alamos https://www.theatlantic.com/technology/archive/2014/01/these...

The demand for the huge calculations for the design of nuclear weapons started in WW II already:

https://ahf.nuclearmuseum.org/ahf/history/human-computers-lo...

"The staff in the T-5 group included recruited women who had degrees in mathematics or physics, as well as, wives of scientists and other workers at Los Alamos. According to Their Day in the Sun: Women of the Manhattan Project, some of the human computers were Mary Frankel, Josephine Elliot, Beatrice “Bea” Langer, Augusta “Mici” Teller, Jean Bacher, and Kay Manley. While some of the computers worked full time, others, especially those who had young children, only worked part time.

General Leslie R. Groves, the Director of the Manhattan Project, pressured the wives of Los Alamos to work because he felt that it was a waste of resources to accommodate civilians. As told by Kay Manley, the wife of Los Alamos physicist John Manley, the recruitment of wives can also be traced to a desire to limit the housing of “any more people than was absolutely necessary.” This reason makes sense given the secretive nature of Los Alamos and the Manhattan Project. SEDs, a group of drafted men who were to serve domestically using their scientific and engineering backgrounds, also worked in the T division."

Re: Cray-1 vs Raspberry Pi

#112

Earlier quoted context omitted.

My favorite was the 33rd in line at the time which was made up of 1700 sony PS3s https://www.google.com/amp/s/phys.org/news/2010-12-air-plays...

They were more or less cousins, as they were both based on the PowerPC CPU architecture.

However the Sony Cell had just a PowerPC controlling core. The real magic, and why it was used in supercomputers at the time, is in its Stream cores; they were highly tailored for vector and floating point maths.

Re: Cray-1 vs Raspberry Pi

#115

I'd just bought the latest and most expensive Intel x86 CPU in 2013 and built myself a new rig. My wife walked into the office, "You're not working, I can tell that, but I'm not sure what you're doing?" she said looking at the graphs on my screen. "I'm calculating to see when my PC would have been the fastest on Earth. It looks like in 1992 it would be able to out-compute the latest Dept of Defense $90m supercomputer…

The other fun thing is to find out the most recent year your phone would have made the bottom of the top 500 list.

My phone is so dumb down that any comparison is useless. It is like driving a Ferrari through a corn field.

Re: Cray-1 vs Raspberry Pi

#116

TL; DR: ten years ago, Raspberry Pis and Android phones were a handful times faster. Nowadays, they are around 100 times faster. Pretty impressive, considering they fit in our pockets.

Thank god they have a modern OS to slow them down. /s

Re: Cray-1 vs Raspberry Pi

#118

Is there any software apart from benchmarks that will make it feel that fast. All softwares that I use feel more advanced version of things that I ran on my 386. GUI, IDE, compiler, office... I understand that the exercise may still be theoretical as any sw used by Met now will be designed for million time fast computers. But there should exist some software that would have required Cray to run then.

A lot of the stuff that took hours back then can now be done in sub-seconds.

Think about mechanical engineering: Back then they might have simulated how cars deform in a crash. Now we can perform similar simulations in real-time for fun in our video games. Afaik it's hardly ever done because no one actually needs physically accurate models in games, but it could be done.

Same goes for rendering back then they rendered each frame of toy story for a good few hours, now we achieve arguably better graphics in real time.

Re: Cray-1 vs Raspberry Pi

#119
post #64

Is there any software apart from benchmarks that will make it feel that fast. All softwares that I use feel more advanced version of things that I ran on my 386. GUI, IDE, compiler, office... I understand that the exercise may still be theoretical as any sw used by Met now will be designed for million time fast computers. But there should exist some software that would have required Cray to run then.

No. The Cray-1 ran batch processing jobs, mostly scientific simulations which took hours or days to compute. It had a terminal interface and wasn't used for real time interactive applications.

IIRC, in real world installations the Cray would have been paired with a minicomputer or mainframe.

Re: Cray-1 vs Raspberry Pi

#120

Earlier quoted context omitted.

What make and model would you recommend for a mini PC? I was thinking of getting one lately.

I got a used Lenovo ThinkCentre M910q i5-6500T 4x2.5GHz 8GB RAM 240GB SSD for 100 €. Plenty fast for a couple of VMs with web servers. It's also a lot better for 24/7 than RPi, as I was always struggling with SD card wear

Thanks.
Post reply on HN