Understanding the Go scheduler is crucial for Go programmer to write efficient concurrent programs. It also helps us become better at troubleshooting performance issues or tuning the performance of our Go programs. In this post, we will explore how Go scheduler evolved over time, and how the Go code we write happens under the hood.

source: HN

But what if the USB connection could be made wirelessly? For a few years, real honest-to-goodness wireless USB devices were actually a thing. Competing standards led to market fracture and the technologies fizzled out relatively quickly in the marketplace, but like the parallel universe of FireWire hubs there was another parallel world of wireless USB devices, at least for a few years. As it happens, we now have a couple of them here, so it’s worth exploring what wireless USB was and what happened to it, how the competing standards worked (and how well), and if it would have helped.

Also with a detailed explanation of UWB.

The key basis technology instead was the concept of ultra wide-band, or UWB, which in modern parlance collectively refers to technologies allowing very weak, very wide-spectrum (in excess of 500MHz) signals to become a short range yet high bandwidth communications channel.

source: HN

PV modules are cheap enough today that the simple fixed East-West arrays are cheaper and faster to install than the industry’s darling, the single-axis tracked array.

source: HN

In the years leading up to its 7 April 1964 launch, however, the 360 was one of the scariest dramas in American business. It took a nearly fanatical commitment at all levels of IBM to bring forth this remarkable collection of machines and software. While the technological innovations that went into the S/360 were important, how they were created and deployed bordered on disaster. The company experienced what science policy expert Keith Pavitt called “tribal warfare”: people clashing and collaborating in a rapidly growing company with unstable, and in some instances unknown, technologies, as uncertainty and ambiguity dogged all the protagonists.

source: HN

In 1993, Intel released the high-performance Pentium processor, the start of the long-running Pentium line. I’ve been examining the Pentium’s circuitry in detail and I came across a circuit to multiply by three, a complex circuit with thousands of transistors. Why does the Pentium have a circuit to multiply specifically by three? Why is it so complicated? In this article, I examine this multiplier—which I’ll call the ×3 circuit—and explain its purpose and how it is implemented.

In 2007, on my first trip to New York City, I grabbed a brand-new DSLR camera and photographed all the fonts I was supposed to love. I admired American Typewriter in all of the I <3 NYC logos, watched Akzidenz Grotesk and Helvetica fighting over the subway signs, and even caught an occasional appearance of the flawlessly-named Gotham, still a year before it skyrocketed in popularity via Barack Obama’s first campaign.

But there was one font I didn’t even notice, even though it was everywhere around me. Last year in New York, I walked over 100 miles and took thousands of photos of one and one font only. The font’s name is Gorton.

source: L

The cargo cult metaphor is commonly used by programmers. This metaphor was popularized by Richard Feynman’s “cargo cult science” talk with a vivid description of South Seas cargo cults. However, this metaphor has three major problems. First, the pop-culture depiction of cargo cults is inaccurate and fictionalized, as I’ll show. Second, the metaphor is overused and has contradictory meanings making it a lazy insult. Finally, cargo cults are portrayed as an amusing story of native misunderstanding but the background is much darker: cargo cults are a reaction to decades of oppression of Melanesian islanders and the destruction of their culture. For these reasons, the cargo cult metaphor is best avoided.

I doubt anyone is going to avoid anything, but the history is very interesting.

The piece of equipment that the entire world has come to rely on—and she is specially trained to handle—is called an extreme ultraviolet lithography machine. It’s the machine that produces the most advanced microchips on the planet. It was built with scientific technologies that sound more like science fiction—breakthroughs so improbable that they were once dismissed as impossible. And it has transformed wafers of silicon into the engines of modern life.

She’s one of the engineers assigned to the fabrication plants—or fabs—where ASML customers manufacture their semiconductors. Hall is based here in Boise, the headquarters of Micron Technology, where I hopped into a bunny suit of my own and followed her inside the chip fab. Then I got a rare, behind-the-scenes peek at what might just be the most important machine ever made.

source: DF

In this post, we will look at how the security of the AES-GCM mode of operation can be completely compromised when a nonce is reused.

Today, the team declared victory. They’ve finally verified the true value of a number called BB(5), which quantifies just how busy that fifth beaver is. They obtained the result — 47,176,870 — using a piece of software called the Coq proof assistant, which certifies that mathematical proofs are free of errors.

source: HN

Somehow, neutrinos went from just another random particle to becoming tiny monsters that require multi-billion-dollar facilities to understand. And there’s just enough mystery surrounding them that we feel compelled to build those facilities since neutrinos might just tear apart the entire particle physics community at the seams.

It started out innocently enough. Nobody asked for or predicted the existence of neutrinos, but there they were in our early particle experiments. Occasionally, heavy atomic nuclei spontaneously—and for no good reason—transform themselves, with either a neutron converting into a proton or vice-versa. As a result of this process, known as beta decay, the nucleus also emits an electron or its antimatter partner, the positron.

There was just one small problem: Nothing added up. The electrons never came out of the nucleus with the same energy; it was a little different every time. Some physicists argued that our conceptions of the conservation of energy only held on average, but that didn’t feel so good to say out loud, so others argued that perhaps there was another, hidden particle participating in the transformations. Something, they argued, had to sap energy away from the electron in a random way to explain this.

source: ars

GPS is perhaps one of the most audacious geo-engineering feats ever undertaken, and its traces can be felt with just an antenna and a motive.

All that said, it’s not as though there’s a cacophony of navigation data swarming around you, deafening if you could just hear it. In reality, the GPS signals surrounding you are astoundingly weak. To take an analogy: imagine a normal light bulb, like the one that might be above you now. Pull it twenty thousand kilometers away from the room you’re in, and have it flash, on, off, on, off, a million times a second. Imagine straining your eye to watch the shimmer of the bulb, two Earths away, and listen to what it’s telling you.

source: trivium

Today, I’d like to tell you about the Etak Navigator, a truly revolutionary product and the world’s first practical vehicle navigation system.

Back in 1985 you used paper maps to navigate, like this one from a Thomas Brother’s map of Los Angeles: A Thomas Brother’s Map. As you can see, the maps weren’t always pretty. By today’s standards it was also supremely difficult and tedious to find locations and even more difficult to work out how to get there. So, when the Etak Navigator launched, it was like something from the future.

source: HN

The 386 processor (1985) was Intel’s most complex processor at the time, with 285,000 transistors. Intel had scheduled 50 person-years to design the processor, but it was falling behind schedule. The design team decided to automate chunks of the layout, developing “automatic place and route” software. This was a risky decision since if the software couldn’t create a dense enough layout, the chip couldn’t be manufactured. But in the end, the 386 finished ahead of schedule, an almost unheard-of accomplishment.

In this article, I take a close look at the “standard cells” used in the 386, the logic blocks that were arranged and wired by software. Reverse-engineering these circuits shows how standard cells implement logic gates, latches, and other components with CMOS transistors. Modern integrated circuits still use standard cells, much smaller now, of course, but built from the same principles.

It’s one of those anachronisms that is deeply embedded in modern technology. From cloud operator servers to embedded controllers in appliances, there must be uncountable devices that think they are connected to a TTY.

source: Dfly

In Alaska, residents are negotiating a contentious relationship with muskoxen, which were introduced to the area decades ago without local consent.

One Iñupiaq word for muskox is umiŋmak, a term that refers to the animal’s beard-like coat. The word’s existence speaks to the Iñupiat’s long relationship with muskoxen, which once roamed the Arctic. The decline of muskoxen is often attributed to climatic changes after the last ice age, along with predation and hunting. Around Nome, few, if any, Indigenous stories about the animals survive.

The average visitor to Nome today would never guess that muskoxen were ever ghosts on the landscape. The animals adorn guidebooks and artwork at gift shops and draw wildlife viewers and photographers. With their bulky coats, sloping shoulders, short legs, and upturned horns, it’s not hard to picture them roaming alongside saber-toothed cats, wooly mammoths, and other big-bodied beasts of the Pleistocene. But all the muskoxen around Nome today have ancestors that saw the inside of a train station in New Jersey. Their reintroduction to Alaska was the result of a decades-long campaign by early 20th-century settlers and promoters, one that followed a template used many times over before and since: it was a plan for developing the Arctic, drawn up without the consent of Indigenous people.

source: HN

“Hypercars” can approach or even exceed 300 m.p.h. Often costing millions of dollars, they’re ostentatious trophies—and sublime engines of innovation.

A windowless telecommunications hub, 33 Thomas Street in New York City embodies an architecture of surveillance and paranoia. That has made it an ideal set for conspiracy thrillers.

When it was completed in Lower Manhattan in 1974, 33 Thomas Street, formerly known as the AT&T Long Lines Building, was intended as the world’s largest facility for connecting long-distance telephone calls. 1 Standing 532 feet — roughly equivalent to a 45-story building — it’s a mugshot for Brutalism, windowless and nearly featureless. Its only apertures are a series of ventilation hoods meant to hide microwave-satellite arrays, which communicate with ground-based relay stations and satellites in space. One of several long lines buildings designed by John Carl Warnecke for the New York Telephone Company, a subsidiary of AT&T, 33 Thomas Street is perhaps the most visually striking project in the architect’s long and influential career. Embodying postwar American economic and military hegemony, the tower broadcasts inscrutability and imperviousness. It was conceived, according to the architect, to be a “skyscraper inhabited by machines.”

source: HN

Nearly a century ago, the Ford Motor Co. spent heavily in blood and coin to construct what became, practically overnight, one of the Amazon’s largest cities. Thousands of acres of forest were razed. Millions of dollars were spent. Hundreds of workers died.

But neither Ford nor the Brazilian government, which assumed control of the property when the company departed in 1945, has done much of anything to preserve this historic town whose brief heyday came at so high a cost. William Clay Ford Jr., Henry’s great-grandson and now the company’s executive chairman, reportedly supported in 1997 the opening of a rubber museum here, but nothing came of it. Meanwhile, the Brazilian government, according to federal attorneys, has for more than 30 years ignored pleas to endow the town with historical protections.

There’s a convenient punching bag for many of these failures: outdated government technology, and outdated approaches to tech by the bureaucracy. But try to fix that through policy change and you’ll find it’s turtles all the way down. The levers leaders use to fix tech are the same ones they use to steer the economy, improve government-funded healthcare, manage immigration, and even strengthen our national defense. We increase budgets, cut budgets, make new rules, and hold hearings, but the tools we use to fix our tools aren’t working either.

The people on this project knew quite well that using this ESB was a terrible idea. They’d have been relieved to just throw it out, plug in the simple protocol, and move on. But they couldn’t. It was a requirement in their contract. The contracting officers had required it because a policy document called the Air Force Enterprise Architecture had required it. The Air Force Enterprise Architecture required it because the Department of Defense Enterprise Architecture required it. And the DoD Enterprise Architecture required it because the Federal Enterprise Architecture, written by the Chief Information Officers Council, convened by the White House at the request of Congress, had required it. Was it really possible that this project was delayed indefinitely, racking up cost overruns in the billions, because Congress has ordered the executive branch to specify something as small and technical as an ESB?

Jack beat them all, winning the contest and demonstrating not only his enormous skills in securing critical national security systems, but an incredible enthusiasm for serving his country. He was a dream candidate, and the Defense Digital Service (DDS), the team that had sponsored the Hack the Pentagon contest, encouraged Jack to apply for a job. But the resume Jack submitted described his experience developing “mobile applications in IonicJS, mobile applications using Angular, and APIs using Node.js, MongoDB, npm, Express gulp, and Babel”. This would have given a technical manager a good sense of the range of his skills, but no one technical reviewed his resume. DoD’s hiring protocols, like those of most agencies, required that it be reviewed by an HR staffer with a background in government hiring rules, not technology. The staffer saw what looked like a grab bag of gobbledygook and tried to match it to the job description, which required “experience that demonstrated accomplishment of computer-project assignments that required a wide range of knowledge of computer requirements and techniques pertinent to the position to be filled.” The fact that he’d just beat out 600 other security researchers meant nothing. His resume was deemed “not minimally qualified” and didn’t make the first cut.