HNHacker News
TopNewBestAskShowJobs

labcomputer

2,317 karma · joined August 2, 2012

submissionscomments
labcomputer··on Mac Studio M5 Ultra 512GB Officially Released
Right. Couple things to note though:

- Larger MoE models only need compute proportional to the number of active parameter, so Qwen3.8-Flash-Next (180b with 6b active) runs more tok/sec than Qwen3.8-27b on the same hardware.

- Larger models typically have higher quality output and require fewer thinking tokens to get to an answer.

Consequently, measuring time to complete a task with a wall clock, the speed difference is less than you would expect.

labcomputer··on Mac Studio M5 Ultra 512GB Officially Released
Large mixture-of-experts models, like Muse Spark or Kimi K3.

MoE models want a different ratio of memory/compute/$ than dense models like a Gemma4 31B or Qwen3.8 27B.

Since only some of the experts are active each round, you don’t need as much compute to get good tok/sec, but you do need a lot of memory to avoid streaming weights from SSD or system RAM.

You could run a full Muse Spark on one of these for $24k at probably around 50 tok/sec.

You’d need 5x RTX 6000 Pros at $80k for Muse Spark (albeit at much higher tok/sec).

On a $24k budget, you’re looking at a maximum of 96GB from Nvidia or 384GB from Intel or AMD. So you’re bottlenecked by PCIe bandwidth, and all those TFLOPS go to waste.

Other configurations of the Studio have similar logic for other MoE models. For instance, Qwen3.8 flash-next runs at a very acceptable 75 tok/sec on a 128GB M5 Max for about 1/3rd the price of an RTX 6000 or 40% less than 4x B70’s.

labcomputer··on US agency approves Amazon Leo’s $11.5B acquisition of Globalstar
Iridium still has a monopoly on high latitudes, too, AFAIK. Their USP is being the only network that works literally anywhere on the surface of the earth.
labcomputer··on New iMac with M6
A $2500 Mac Studio with M5 Max running Qwen3.8-27b or Gemma4:31b in oMLX gets about the same speeds you quoted... and it comes with a warranty and has enough memory not to choke at longer context lengths.
labcomputer··on New iMac with M6
SSD token caching (like oMLX does) goes a long way for prefill. Typical miss rates are under 5% in long coding sessions, which is mostly the output of a turn's tool use.
labcomputer··on New iMac with M6
iPhones have great cameras. Get a MagSafe mount for on top of the monitor and stick the camera to it. The feature is called "continuity camera", and it works with any Mac app that would use a USB webcam.
labcomputer··on New iMac with M6
The Dell is only 450 nits, and the Kuycon site says the it costs $1050 delivered to the US with a stand ($950 if you BYO VESA stand).

Even using the sale prices, an iMac is still cheaper than a Mini with the Kuycon.

labcomputer··on New iMac with M6
And it's almost impossible to find ones that get as bright as Apple monitors for less than Apple charges!

My absolute favorite feature of Apple displays is that I don't need to have the brightness cranked to max all the time, even when sitting next to a window. Some of them are, dare I say it, too bright for a normal office at maximum brightness (yet still dim for comfort in a pitch black room).

There are some good alternatives if your budget stretches to $1000, though: Samsung's 27" ViewFinity S9 comes to mind, with 2880p and 600 nits.

labcomputer··on US designates helium as a critical material
That's a common misconception. You can't make the calculation purely on the mass of raw material needed to get a X kg of Y% material.

Every enrichment process drops in efficiency as the enrichment increases, asymptotically approaching that process's enrichment ceiling.

That's why nobody uses thermal diffusion to enrich uranium: It's by far the easiest method (you can do it with 1800's technology), but the practical maximum enrichment fraction is too low for anything useful (other than providing feedstock to better enrichment processes).

That's also the reason a centrifuge enrichment plant uses warehouses full of cascaded centrifuges: The centripetal force inside the centrifuge is working against a diffusion gradient, so each stage only gives a small percentage decrease of the "derichment" fraction.

Once you pass 50%, you stop looking for U-235 needles in a haystack to keep and start looking for U-238 needles in a haystack to throw away.

labcomputer··on Time Nuts (2005)
Because then the distance between earth's pole and equator would no longer be 10,000 km.
labcomputer··on Where Wealth Is Moving in America (2023)
Florida has a problem with insurance fraud, which is what drives the rates up. If you can afford to self-insure, the expectation value of doing that is much better than the EV of using a commercial insurer (who has to price in the risk that you are an insurance fraudster)
labcomputer··on Where Wealth Is Moving in America (2023)
Maybe I’m misunderstanding your suggestion, but shares are already treated as ordinary income when they vest (when the shares are released to you and you first gain the right to sell them).

If a company pays you $1M of shares, the IRS treats it exactly the same as if you were paid $1M of cash and you used it to buy the shares. The capital gains work the same too: you pay capital gains tax on the difference in value between when you receive the shares and when you sell them. That’s how it already works.

labcomputer··on Where Wealth Is Moving in America (2023)
I thought it was obvious that I speaking about marginal use of government services.

When a billionaire moves to Wyoming, the marginal tax revenue is far greater than the marginal cost of police services, for example.

labcomputer··on Where Wealth Is Moving in America (2023)
A state can justify and sustain higher taxes on the wealthy by offering government services which indirectly benefit the wealthy (the externalities you mention). But it doesn’t follow that an arbitrarily poorly-ran government can sustain arbitrarily high taxes on the wealthy.

There’s some manifold of Pareto-optimal solutions to the problem of taxes and services.

California, for example, spends a lot of money to get not-great public schools, and has housing costs that are out of control. So if you’re importing new hires from other states, and pay them a lot to live here, and personally pay high taxes on top of that… that doesn’t seem like a Pareto-optimal point.

At some point, the wealthy will decide to move someplace that looks more Pareto-optimal. Better externalities, lower taxes, or both.

labcomputer··on Where Wealth Is Moving in America (2023)
The type of people who move from CA to WY for the tax benefits are the type of people who pay more taxes than they use in government services (even with very low tax rates). That means WY can offer more government services to the rest of its residents, making it more hospitable.

It is a fiscal detriment to CA and NY though.

labcomputer··on Airbnb bans making guests do dishes and take out the trash
I mean, some customers want the hostel experience, too.

The problem is a lot of AirBnB hosts want to offer the hostel experience for hotel prices.

labcomputer··on Airbnb bans making guests do dishes and take out the trash
I'd argue that it is that interesting of a problem because it gives outsiders (us) insight into AirBnB's marketplace dynamics.

It has long been obvious that many scammy hosts exist on the platform, and it ought to be easy to detect such hosts if they bother to try. Yet, that never happened until now.

So what changed? I would bet that until now they have always worried about having enough inventory to sell, and that now they are noticing they have too much inventory. That changes the dynamics from "be extra nice to those who bring the inventory, and even tolerate a little fraud from them" to "be extra nice to those bringing the dollars".

I do wonder if this is an early sign of a coming recession.

labcomputer··on AfD Leak: What 421,179 Hacked Emails Show about the German Far Right
I want to start by saying I think the AfD is detestable so that you don't get the wrong idea from my question:

In other parts of this thread we have people saying that the AfD must be banned because they are a threat to democracy and that the German constitution has provisions which prevent amending it to weaken the guarantee of democracy...

But how do you then reconcile the idea that people must be prevented from voting for the party they wish? Is that not undermining democracy when you only let them vote when they vote "correctly"?

labcomputer··on SIGSALY: Churchill's top secret hotline to the president
I'm not sure whether or not I'd call it a kludge, but the workings are totally unlike the A-3 scrambler.

Splitting audio into bands and voiced/unvoiced content is basically how many "modern" low-bandwidth voice coding techniques like LPC, MELP, or CLEP work (see https://en.wikipedia.org/wiki/Linear_predictive_coding). The point of that processing is to compress, not encipher, the voice data.

Analog scramblers, like A-3, by contrast, shift the frequency content of the speech as the means of encipherment.

The point of the SIGSALLY voice coder is simply to keep the amount of key material for the one time pad reasonable. Even with that compression, each OTP record lasted only 12 minutes. MELP, which is a current DoD vocoder standard for use in secure voice channels, produces intelligible speech rates as low as 600 bps.

The part that is definitely a kluge is the key synchronization method. It seems that they did not use a PLL (which had already been invented by that point) to keep both ends in sync and instead relied on highly precise frequency references and turntables driven by synchronous motors with hundreds of poles.

labcomputer··on US federal budget deficit jumps 12% in one year to nearly $2 Trillion
The primary factor (in my view) is that we pay healthcare providers (doctors and nurses) 2x to 3x as much as other developed countries.

That creates knock-on effects throughout the healthcare system:

* Doctor time is worth $xxx/hour, so every second counts. We hire a bunch of support staff to make sure doctors aren't "wasting" time on paperwork, taking vitals or talking to patients. Now it costs more to run a practice.

* Doctor time is worth $xxx/hour, so we need to make sure that health insurance only pays for procedures that people truly need. That leads to insurance companies hiring a bunch of doctors and nurses to adjudicate claims (that's expensive, plus fewer doctors practice medicine). It also leads to denied care.

* Doctors have a lot of money, so if a procedure goes bad and you want to sue someone, they make a juicy target. Now you have higher malpractice insurance, so doctors bill even more.

* Doctors are afraid of being sued (see previous), so they often order more tests than necessary to prove they are providing adequate care. Those tests cost money.

The cause of high doctor salaries is an artificial shortage of doctors. Medical schools collude to limit the number of medical students who matriculate each year, which squeezes supply.

We could very easily fix the American healthcare system in about 10 years by simply allowing doctors and nurses trained in other developed countries to practice here, plus forcing medical schools to accept more students.

Regarding the latter, there is no shortage of qualified applicants:

1. Nearly everyone who starts medical school finishes. Matriculants are so statistically overqualified that hardly anyone washes out.

2. Medical schools have silly-stupid entrance requirements which have little to do with being a good doctor. Beyond GPA, you need many hours of volunteer work outside of class, extracurricular activities, and often research experience. These admissions requirements are imposed because there are simply too many qualified applicants for the number of slots and med schools need some "fair" way to cull the herd.

labcomputer··on Tesla Roadster
Don't forget that the leader of Dawn Project has financial conflicts of interest:

His software company, named Green Hills, supplies the RTOS for Mobileye, which formerly supplied driver-assistance hardware and software to Tesla (and continues to do so for other car companies). Mobileye is no longer a Tesla supplier because Tesla insourced their ADAS.

So he has a very real financial incentive to convince the world that Tesla's system is bad.

labcomputer··on Apple's new 'Switch to Safari' campaign details why you should ditch Chrome
Ok, I'll bite: How would you choose not to install Chrome? You would just... not use the web? Some choice.
labcomputer··on Apple's new 'Switch to Safari' campaign details why you should ditch Chrome
Are they? Or are a bunch of Chrome fanboys and web devs complaining on their behalf?
labcomputer··on Ask HN: Who's still keeping a DOS machine up because the business depends on it?
The problem is that a lot of those old ISA drivers were peeking and poking card registers as fast as the bus would allow, which was over 1 MHz (less than 1 microsecond per transaction), not DMAing data to RAM (though some did that too).

With a modern 4 GHz CPU, that means your budget is only 4000 clocks per interrupt. The context save alone can make it hard to hit 1MHz, and you really want to have your interrupt code pinned to the L1 cache because a few memory reads will blow your entire budget.

As nice as USB4 is, I’ve never heard anyone claim it has single-digit microsecond latency, to say nothing of sub-microsecond latency. The typically-quoted ~20 usec latency of USB4 limits it to around 50 kHz for an emulated ISA card.

labcomputer··on SR-71's "R2-D2" Could Be Key to Winning Future Fights in GPS Denied Environments
So… while that’s true of most astronav systems to date (particularly the ones meant to be used during daytime, and especially with reference stars potentially near the horizon), I’m not sure that’s really a hard requirement.

If you restrict the domain to nighttime or exoatmospheric, a high-resolution wide-angle camera paired with an offline astrometry database has the makings of a strapdown astronav.

Widening the domain again, the natural motion of the vehicle is probably enough, when combined with inertial sensors to aid pixel-shift image stabilization, to achieve the same kind of processing gain as the older systems got with shutter-synchronous detection.

labcomputer··on The FAA's plan to fix air traffic? $875M worth of AI
Maybe because literally the entire world is currently using that system, and sending machine-readable clearances to just some airplanes means that the non-equipped planes are denied situational awareness?
labcomputer··on NTSB issues investigative update on B-767 runway excursion accident in Miami
Yea, they couldn’t get the left gear down because they they had enough airspeed to execute a go-around!

Literally 5 consecutive minutes of making 100s of wrong decisions snatching defeat from the jaws of victory.

According to news reports, a magistrate judge at OSHA has been sandbagging an investigation into retaliatory firings by this airline (of pilots who reported unsafe practices with maintenance, CRM, training, scheduling, everything). I wonder if the NTSB will include that judge in the investigation. It seems like he or she has a lot to answer for.

https://www.cbsnews.com/news/miami-plane-crash-21-air-safety...

labcomputer··on AirPods 5
The real problem is that they tried to replace the function keys (and especially the esc key) instead of supplementing them.
labcomputer··on Growing proof that autonomous cars save lives
Strangely enough... Most US states do not require insurance. Yes, really!

In almost every state, you may post a bond in lieu of insurance, for an amount as low as $35,000!

labcomputer··on What do Visa and Mastercard do? An intro to card networks
Er what?

You don’t even pay for the fraudulent credit card transactions in the first place! There’s no money for them to return!

Page 1 of 34Next →