ridiculous_fish
Joined 16 years ago
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Comment · 7 days ago
Link looks to be broken.
Comment · 29 days ago
Oklo | Remote (US) or Santa Clara or Brooklyn | Full time | https://oklo.com
Join us in pioneering the next generation of nuclear reactors! You'll leverage your software skills alongside nuclear engineers to model, simulate, design, and deploy advanced fission power technology. You will work at the forefront of the nuclear industry, developing novel techniques to reach new levels of safety, efficiency, and resiliency. Come be a part of powering the future with advanced fission power plants to provide clean, reliable, affordable energy.
We are hiring for:
- Software Engineer: https://job-boards.greenhouse.io/oklo/jobs/4018702004
- Senior Software Engineer: https://job-boards.greenhouse.io/oklo/jobs/5739483004
- Software Engineer (Applied AI/ML): https://job-boards.greenhouse.io/oklo/jobs/6150355004
See more opportunities here: https://job-boards.greenhouse.io/oklo
Please mention Hacker News in your cover letter!
Comment · 1 month ago
Say your boundary is a spherical shell, with a radially constant electric field. Based only on those boundary conditions, you cannot know the distribution of charges inside the shell. It could be a point charge, a solid sphere, a smaller shell, etc.
So classically you cannot decipher the entire contents of the box just from its surface!
Comment · 2 months ago
Oklo | Remote (US) or Santa Clara or Brooklyn | Full time | https://oklo.com
Join us in pioneering the next generation of nuclear reactors! You'll leverage your software skills alongside nuclear engineers to model, simulate, design, and deploy advanced fission power technology. You will work at the forefront of the nuclear industry, developing novel techniques to reach new levels of safety, efficiency, and resiliency. Come be a part of powering the future with advanced fission power plants to provide clean, reliable, affordable energy.
We are hiring for:
- Software Engineer: https://job-boards.greenhouse.io/oklo/jobs/4018702004
- Senior Software Engineer: https://job-boards.greenhouse.io/oklo/jobs/5739483004
- Software Engineer (Applied AI/ML): https://job-boards.greenhouse.io/oklo/jobs/6150355004
See more opportunities here: https://job-boards.greenhouse.io/oklo
Please mention Hacker News in your cover letter!
Comment · 3 months ago
Seconded - those RealTek dongles are no good.
For my Macs, the IOCrest USB4 adapters with the AQC113 chipset have been rock-solid and can saturate my 10Gbe network. They do run hot but no stability issues. That's what I use and recommend.
The newer RTL8159 based dongles are smaller, cheaper, cooler, and can do 10 Gbe on paper. But they top out at 7 Gbps on Macs, which don't implement the USBx2 spec.
Comment · 4 months ago
Oklo | Remote (US) or Santa Clara or Brooklyn | Full time | https://oklo.com
Join us in pioneering the next generation of nuclear reactors! You'll leverage your software skills alongside nuclear engineers to model, simulate, design, and deploy advanced fission power technology. You will work at the forefront of the nuclear industry, developing novel techniques to reach new levels of safety, efficiency, and resiliency. Come be a part of powering the future with advanced fission power plants to provide clean, reliable, affordable energy.
We are hiring for:
- Software Engineer: https://job-boards.greenhouse.io/oklo/jobs/4018702004
- Senior Software Engineer: https://job-boards.greenhouse.io/oklo/jobs/5739483004
See more opportunities here: https://job-boards.greenhouse.io/oklo
Please mention Hacker News in your cover letter!
Comment · 6 months ago
I bought one of these as soon as I heard about it ($74 from eBay) and tested it against my USB-4 AQC113 mainstays ($87, IO CREST brand on Amazon), from my MBP.
The new RTL-based adapter is physically smaller, runs way cooler, but only gets ~6 Gbps from my Mac to my Linux box, with a lot of jitter (iperf3).
The AQC adapter is all metal, gets uncomfortably hot, and sustains 9.3 Gbps, no problem. It's about the same size as the middle adapter in the photo.
The USB-4 AQC adapters are only ~$13 more, and yet are significantly faster with lower jitter. I'm staying with those.
Hope that helps someone!
Comment · 6 months ago
This paper missed the state of the art!!!
This concerns unsigned division by a 32 bit constant divisor. Compilers routinely optimize this to a high-multiply by a "magic number" but this number may be up to 33 bits (worst-case, divisor dependent, 7 is a problem child). So you may need a 32x33-bit high multiply.
What compilers do today is some bit tricks to perform a 32x33 bit high multiply through a 32x32 multiply and then handling the last bit specially, through additions and bitshifts. That's the "GM Method" in the paper; the juice to be squeezed out is the extra stuff to handle the 33rd bit.
What the paper observes is that 32x33 high multiply can be performed via a 64x64 high multiply and then the extra stuff goes away. Well yes, of course.
But amazingly in ALL of these worst case situations you can compute a different magic number, and perform a (saturating) increment of the dividend at runtime, and ONLY need a 32 bit high multiply.
That is, these are the two algorithms for unsigned division by constants where the magic number overflows:
- This paper: Promote to twice the bit width, followed by high multiply (32x64 => 64) and then bitshift
- SOTA: Saturating increment of the dividend, then high multiply (32x32 => 32) and then bitshift
Probably the paper's approach is a little better on wide multipliers, but they missed this well-known technique published 15 years ago (and before that, I merely rediscovered it):
https://ridiculousfish.com/blog/posts/labor-of-division-epis...
Comment · 6 months ago
I was curious how defer is implemented. `defer` in Go is famously function-scoped, not lexically-scoped. This means that the number of actively-deferred statements is unbounded, which implies heap allocation.
The answer is that Solod breaks with Go semantics here: it just makes defer block-scoped (and unavailable in for/if blocks, which I don't quite get).
https://github.com/solod-dev/solod/blob/main/doc/spec.md#def...
Comment · 7 months ago
Thank you for flagging this, that definitely shouldn't be happening. Possibly we have an over-zealous spam filter. If you and your friend are open to it, please email me at pca@[company].com and I will personally look into it.
Comment · 7 months ago
Oklo | Remote (US) or Santa Clara or Brooklyn | Full time | https://oklo.com
Join us in pioneering the next generation of nuclear reactors! You'll leverage your software skills alongside nuclear engineers to model, simulate, design, and deploy advanced fission power technology. You will work at the forefront of the nuclear industry, developing novel techniques to reach new levels of safety, efficiency, and resiliency. Come be a part of powering the future with advanced fission power plants to provide clean, reliable, affordable energy.
We are hiring for:
- Software Engineer: https://job-boards.greenhouse.io/oklo/jobs/4018702004
- Senior Software Engineer: https://job-boards.greenhouse.io/oklo/jobs/5739483004
- Software Engineer (Infrastructure): https://job-boards.greenhouse.io/oklo/jobs/5784826004
- Software Quality Assurance Lead: https://job-boards.greenhouse.io/oklo/jobs/5480416004
See more opportunities here: https://job-boards.greenhouse.io/oklo
Please mention Hacker News in your cover letter!
Comment · 7 months ago
Why would an allocation require an atomic write for a reference count?
Swift routinely optimizes out reference count traffic.