Lightning Talk: How Fast Are Computers (in Human Terms)? - Matt Godbolt - C++ on Sea 2023
Ғылым және технология
cpponsea.uk/
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Lightning Talk: How Fast Are Computers (in Human Terms)? - Matt Godbolt - C++ on Sea 2023
Testing audience's intuition about how fast modern computers are.
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Slides: github.com/philsquared/cppons...
Sponsored by think-cell: www.think-cell.com/en/
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Matt Godbolt
I'm a C++ developer who's passionate about the seemingly opposite goals of good, readable code and high performance code. I love taking the lid off and looking underneath, be it the compiler, the operating system, or even the silicon that runs everything.
By day I write software for quantitative trading company Aquatic. By night I hack on hobby projects ranging from emulating old computers in your browser to compiler exploration tools.
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C++ on Sea is an annual C++ and coding conference, in Folkestone, in the UK.
- Annual C++ on Sea, C++ conference: cpponsea.uk/
- 2023 Program: cpponsea.uk/2023/schedule/
- Twitter: / cpponsea
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Пікірлер: 22
I love how as the access time got slower and slower, the talk got faster and faster 😂
@MattGodbolt
8 ай бұрын
I was running out of time!
@cefcephatus
8 ай бұрын
As data access gets slower, we need smaller protocol overhead.
Speedrunning a talk that compares the speed of computers to humans, I love it
Sad this talk had to be cut short, I would have enjoyed a slightly longer version!
@EmmanuelMessulam
8 ай бұрын
I think I saw an old, longer, talk about this a few years ago.
There's a commensurate list of the energy cost of all these operations: Getting a double variable from RAM is orders of magnitude more costly than squaring the 64-bit floating point value you just loaded.
@chrisvinciguerra4128
8 ай бұрын
Makes sense really but it’s odd to think about that overall CPU power draw is just the sum of tiny amounts of energy lost each operation, and that the type of operation may impact power draw, rather than program’s utilization of resources.
loved it!
Also listen to the podcast Two's Complement; they had an episode about that topic 😊
Interesting perspective, too bad the presentation was cut short.
Matt is the funniest guy! Great talk!
Giving a funny and short talk, 5:26.
This talk was so long, I could've gone down to L3 cache and back.
Huh, I knew division was slow but 20-100 cycles? That's insane. So that means if you need to do repeated divisions with the same divisor it's cheaper to calculate its inverse and then multiplying each time? Or can compilers already do that as optimization?
@MrKogarou
7 ай бұрын
You'd be switching to float arithmetic which might mess up the modulo use-case. But for other applications your suggestion sounds interesting.
@MichaelPohoreski
7 ай бұрын
Compilers have been implementing division using multiply by reciprocal for decades. Check out godbolt compiler explorer for details.
Genius idea🤯
So this talk is about 200 ns if an AI were to watch it.
Most computers can't move on there own. So like 0 km/h. (That's about 0 miles per hour)
The main takeaway from this talk is, that humans are way too slow.