Saturday, January 20th, 2024

Time	Event
12:02a	Researchers Claim First Functioning Graphene-Based Chip An anonymous reader quotes a report from IEEE Spectrum: Researchers at Georgia Tech, in Atlanta, have developed what they are calling the world's first functioning graphene-based semiconductor. This breakthrough holds the promise to revolutionize the landscape of electronics, enabling faster traditional computers and offering a new material for future quantum computers. The research, published on January 3 in Nature and led by Walt de Heer, a professor of physics at Georgia Tech, focuses on leveraging epitaxial graphene, a crystal structure of carbon chemically bonded to silicon carbide (SiC). This novel semiconducting material, dubbed semiconducting epitaxial graphene (SEC) -- or alternatively, epigraphene -- boasts enhanced electron mobility compared with that of traditional silicon, allowing electrons to traverse with significantly less resistance. The outcome is transistors capable of operating at terahertz frequencies, offering speeds 10 times as fast as that of the silicon-based transistors used in current chips. De Heer describes the method used as a modified version of an extremely simple technique that has been known for over 50 years. "When silicon carbide is heated to well over 1,000C, silicon evaporates from the surface, leaving a carbon-rich surface which then forms into graphene," says de Heer. This heating step is done with an argon quartz tube in which a stack of two SiC chips are placed in a graphite crucible, according to de Heer. Then a high-frequency current is run through a copper coil around the quartz tube, which heats the graphite crucible through induction. The process takes about an hour. De Heer added that the SEC produced this way is essentially charge neutral, and when exposed to air, it will spontaneously be doped by oxygen. This oxygen doping is easily removed by heating it at about 200C in vacuum. "The chips we use cost about [US] $10, the crucible about $1, and the quartz tube about $10," said de Heer. [...] De Heer and his research team concede, however, that further exploration is needed to determine whether graphene-based semiconductors can surpass the current superconducting technology used in advanced quantum computers. The Georgia Tech team do not envision incorporating graphene-based semiconductors with standard silicon or compound semiconductor lines. Instead, they are aiming for a paradigm shift beyond silicon, utilizing silicon carbide. They are developing methods, such as coating SEC with boron nitride, to protect and enhance its compatibility with conventional semiconductor lines. Comparing their work with commercially available graphene field-effect transistors (GFETs), de Heer explains that there is a crucial difference: "Conventional GFETs do not use semiconducting graphene, making them unsuitable for digital electronics requiring a complete transistor shutdown." He says that the SEC developed by his team allows for a complete shutdown, meeting the stringent requirements of digital electronics. De Heer says that it will take time to develop this technology. "I compare this work to the Wright brothers' first 100-meter flight. It will mainly depend on how much work is done to develop it." Read more of this story at Slashdot. (Comment on this)
12:45a	OpenAI Ceo Sam Altman Is Still Chasing Billions To Build AI Chips According to Bloomberg (paywalled), OpenAI CEO Sam Altman is reportedly raising billions to develop a global network of chip fabrication factories, collaborating with leading chip manufacturers to address the high demand for chips required for advanced AI models. The Verge reports: A major cost and limitation for running AI models is having enough chips to handle the computations behind bots like ChatGPT or DALL-E that answer prompts and generate images. Nvidia's value rose above $1 trillion for the first time last year, partly due to a virtual monopoly it has as GPT-4, Gemini, Llama 2, and other models depend heavily on its popular H100 GPUs. Accordingly, the race to manufacture more high-powered chips to run complex AI systems has only intensified. The limited number of fabs capable of making high-end chips is driving Altman or anyone else to bid for capacity years before you need it in order to produce the new chips. And going against the likes of Apple requires deep-pocketed investors who will front costs that the nonprofit OpenAI still can't afford. SoftBank Group and Abu Dhabi-based AI holding company G42 have reportedly been in talks about raising money for Altman's project. Read more of this story at Slashdot. (Comment on this)
3:30a	US Government Opens 22 Million Acres of Federal Lands To Solar An anonymous reader quotes a report from Electrek: The Biden administration has updated the roadmap for solar development to 22 million acres of federal lands in the US West. The Bureau of Land Management (BLM) and the Department of Energy's National Renewable Energy Laboratory have determined that 700,000 acres of federal lands will be needed for solar farms over the next 20 years, so BLM recommended 22 million acres to give "maximum flexibility" to help the US reach its net zero by 2035 power sector goal. The plan is an update of the Bureau of Land Management's 2012 Western Solar Plan, which originally identified areas for solar development in six states -- Arizona, California, Colorado, Nevada, New Mexico, and Utah. The updated roadmap refines the analysis in the original six states and expands to five more states -- Idaho, Montana, Oregon, Washington, and Wyoming. It also focuses on lands within 10 miles of existing or planned transmission lines and moves away from lands with sensitive resources. [...] BLM under the Biden administration has approved 47 clean energy projects and permitted 11,236 megawatts (MW) of wind, solar, and geothermal energy on public lands, enough to power more than 3.5 million homes. Ben Norris, vice president of regulatory affairs at the Solar Energy Industries Association (SEIA), said in response to BLM's announced Western Solar Plan updates: "The proposal ... identifies 200,000 acres of land near transmission infrastructure, helping to correct an important oversight and streamline solar development. Under the current policy, there are at least 80 million acres of federal lands open to oil and gas development, which is 100 times the amount of public land available for solar. BLM's proposal is a big step in the right direction and recognizes the key role solar plays in our energy economy." Read more of this story at Slashdot. (Comment on this)
4:34p	Ceph: a Journey To 1 TiB/s It's "a free and open-source, software-defined storage platform," according to Wikipedia, providing object storage, block storage, and file storage "built on a common distributed cluster foundation". The charter advisory board for Ceph included people from Canonical, CERN, Cisco, Fujitsu, Intel, Red Hat, SanDisk, and SUSE. And Nite_Hawk (Slashdot reader #1,304) is one of its core engineers — a former Red Hat principal software engineer named Mark Nelson. (He's now leading R&D for a small cloud systems company called Clyso that provides Ceph consulting.) And he's returned to Slashdot to share a blog post describing "a journey to 1 TiB/s". This gnarly tale-from-Production starts while assisting Clyso with "a fairly hip and cutting edge company that wanted to transition their HDD-backed Ceph cluster to a 10 petabyte NVMe deployment" using object-based storage devices [or OSDs]...) I can't believe they figured it out first. That was the thought going through my head back in mid-December after several weeks of 12-hour days debugging why this cluster was slow... Half-forgotten superstitions from the 90s about appeasing SCSI gods flitted through my consciousness... Ultimately they decided to go with a Dell architecture we designed, which quoted at roughly 13% cheaper than the original configuration despite having several key advantages. The new configuration has less memory per OSD (still comfortably 12GiB each), but faster memory throughput. It also provides more aggregate CPU resources, significantly more aggregate network throughput, a simpler single-socket configuration, and utilizes the newest generation of AMD processors and DDR5 RAM. By employing smaller nodes, we halved the impact of a node failure on cluster recovery.... The initial single-OSD test looked fantastic for large reads and writes and showed nearly the same throughput we saw when running FIO tests directly against the drives. As soon as we ran the 8-OSD test, however, we observed a performance drop. Subsequent single-OSD tests continued to perform poorly until several hours later when they recovered. So long as a multi-OSD test was not introduced, performance remained high. Confusingly, we were unable to invoke the same behavior when running FIO tests directly against the drives. Just as confusing, we saw that during the 8 OSD test, a single OSD would use significantly more CPU than the others. A wallclock profile of the OSD under load showed significant time spent in io_submit, which is what we typically see when the kernel starts blocking because a drive's queue becomes full... For over a week, we looked at everything from bios settings, NVMe multipath, low-level NVMe debugging, changing kernel/Ubuntu versions, and checking every single kernel, OS, and Ceph setting we could think of. None these things fully resolved the issue. We even performed blktrace and iowatcher analysis during "good" and "bad" single OSD tests, and could directly observe the slow IO completion behavior. At this point, we started getting the hardware vendors involved. Ultimately it turned out to be unnecessary. There was one minor, and two major fixes that got things back on track. It's a long blog post, but here's where it ends up: Fix One: "Ceph is incredibly sensitive to latency introduced by CPU c-state transitions. A quick check of the bios on these nodes showed that they weren't running in maximum performance mode which disables c-states." Fix Two: [A very clever engineer working for the customer] "ran a perf profile during a bad run and made a very astute discovery: A huge amount of time is spent in the kernel contending on a spin lock while updating the IOMMU mappings. He disabled IOMMU in the kernel and immediately saw a huge increase in performance during the 8-node tests." In a comment below, Nelson adds that "We've never seen the IOMMU issue before with Ceph... I'm hoping we can work with the vendors to understand better what's going on and get it fixed without having to completely disable IOMMU." Fix Three: "We were not, in fact, building RocksDB with the correct compile flags... It turns out that Canonical fixed this for their own builds as did Gentoo after seeing the note I wrote in do_cmake.sh over 6 years ago... With the issue understood, we built custom 17.2.7 packages with a fix in place. Compaction time dropped by around 3X and 4K random write performance doubled." The story has a happy ending, with performance testing eventually showing data being read at 635 GiB/s — and a colleague daring them to attempt 1 TiB/s. They built a new testing configuration targeting 63 nodes — achieving 950GiB/s — then tried some more performance optimizations... Read more of this story at Slashdot. (Comment on this)
6:34p	'For Truckers Driving EVs, There's No Going Back' The Washington Post looks at "a small but growing group of commercial medium-to-heavy-duty truck drivers who use electric trucks." "These drivers — many of whom operate local or regional routes that don't require hundreds of miles on the road in a day — generally welcome the transition to electric, praising their new trucks' handling, acceleration, smoothness and quiet operation. "Everyone who has had an EV has no aspirations to go back to diesel at this point," said Khari Burton, who drives an electric Volvo VNR in the Los Angeles area for transport company IMC. "We talk about it and it's all positivity. I really enjoy the smoothness ... and just the quietness as well." Mike Roeth, the executive director of the North American Council for Freight Efficiency, said many drivers have reported that the new vehicles are easier on their bodies — thanks to both less rocking off the cab, assisted steering and the quiet motor. "Part of my hypothesis is that it will help truck driver retention," he said. "We're seeing people who would retire driving a diesel truck now working more years with an electric truck." Most of the electric trucks on the road today are doing local or regional routes, which are easier to manage with a truck that gets only up to 250 miles of range... Trucking advocates say electric has a long way to go before it can take on longer routes. "If you're running very local, very short mileage, there may be a vehicle that can do that type of route," said Mike Tunnell, the executive director of environmental affairs for the American Trucking Association. "But for the average haul of 400 miles, there's just nothing that's really practical today." There's other concerns, according to the article. "[S]ome companies and trucking associations worry this shift, spurred in part by a California law mandating a switch to electric or emissions-free trucks by 2042, is happening too fast. While electric trucks might work well in some cases, they argue, the upfront costs of the vehicles and their charging infrastructure are often too heavy a lift." But this is probably the key sentence in the article: For the United States to meet its climate goals, virtually all trucks must be zero-emissions by 2050. While trucks are only 4 percent of the vehicles on the road, they make up almost a quarter of the country's transportation emissions. The article cites estimates that right now there's 12.2 million trucks on America's highways — and barely more than 1% (13,000) are electric. "Around 10,000 of those trucks were just put on the road in 2023, up from 2,000 the year before." (And they add that Amazon alone has thousands of Rivian's electric delivery vans, operating in 1,800 cities.) But the article's overall message seems to be that when it comes to the trucks, "the drivers operating them say they love driving electric." And it includes comments from actual truckers: 49-year-old Frito-Lay trucker Gary LaBush: "I was like, 'What's going on?' There was no noise — and no fumes... it's just night and day." 66-year-old Marty Boots: Diesel was like a college wrestler. And the electric is like a ballet dancer... You get back into diesel and it's like, 'What's wrong with this thing?' Why is it making so much noise? Why is it so hard to steer?" Read more of this story at Slashdot. (Comment on this)
7:34p	Revolutionary 'LEGO-Like' Photonic Chip Paves Way For Semiconductor Breakthroughs "Researchers at the University of Sydney Nano Institute have developed a small silicon semiconductor chip that combines electronic and photonic (light-based) elements," reports SciTechDaily. "This innovation greatly enhances radio-frequency (RF) bandwidth and the ability to accurately control information flowing through the unit." Expanded bandwidth means more information can flow through the chip and the inclusion of photonics allows for advanced filter controls, creating a versatile new semiconductor device. Researchers expect the chip will have applications in advanced radar, satellite systems, wireless networks, and the roll-out of 6G and 7G telecommunications and also open the door to advanced sovereign manufacturing. It could also assist in the creation of high-tech value-add factories at places like Western Sydney's Aerotropolis precinct. The chip is built using an emerging technology in silicon photonics that allows the integration of diverse systems on semiconductors less than 5 millimeters wide. Pro-Vice-Chancellor (Research) Professor Ben Eggleton, who guides the research team, likened it to fitting together Lego building blocks, where new materials are integrated through advanced packaging of components, using electronic 'chiplets'.... Dr Alvaro Casas Bedoya, Associate Director for Photonic Integration in the School of Physics, who led the chip design, said the unique method of heterogeneous materials integration has been 10 years in the making. "The combined use of overseas semiconductor foundries to make the basic chip wafer with local research infrastructure and manufacturing has been vital in developing this photonic integrated circuit," he said. "This architecture means Australia could develop its own sovereign chip manufacturing without exclusively relying on international foundries for the value-add process...." The photonic circuit in the chip means a device with an impressive 15 gigahertz bandwidth of tunable frequencies with spectral resolution down to just 37 megahertz, which is less than a quarter of one percent of the total bandwidth. Read more of this story at Slashdot. (Comment on this)

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