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APEX4: Efficient Pure W4A4 LLM Inference via Intra-SM Compute Rebalancing
arXiv:2606.08761v1 Announce Type: new Abstract: W4A4 quantization promises full utilization of INT4 Tensor Cores, yet group dequantization overhead on CUDA Cores has driven existing systems to mixed-precision fallbacks. We present the first systematic study of how intra-SM compute balance governs this bottleneck. Through controlled benchmarks across four GPUs from Ampere and Ada architectures, we identify the Tensor Cores to CUDA Cores throughput ratio ($\rho$) as the primary hardware...
Restartable Sequences
May 31st, 2026 @ justine's web page The best kept secret at the frontier of system programming right now is the Linux 4.18+ (c. 2018) concept of restartable sequences or rseq for short. They allow you to create thread-safe data structures without locks or atomics which scale to microprocessors with many cores. It's currently only possible to use rseq on Linux using handwritten assembly code.
Hessian-recovery-based C0 finite element methods for non-divergence form elliptic equations
arXiv:2606.03276v1 Announce Type: new Abstract: A Hessian-recovery-based C0 finite element framework is proposed for second-order elliptic equations in non-divergence form. The construction is based on a direct approximation of the strong non-divergence operator: the Hessian D2u is replaced by a recovered Hessian Hhuh, so that A : D2u is approximated by A : Hhuh. The resulting discretizations include a nodal formulation and a Galerkin-type formulation for general Lagrange finite element...
Arm moves into the heart of the cloud stack
Arm-based processors are becoming a fundamental part of modern cloud infrastructure, moving beyond being a mere option. Major hyperscalers like AWS, Google Cloud, and Microsoft Azure are deploying Arm silicon to meet growing demands for performance while controlling power consumption and cost. This shift is enabling significant efficiency gains, with some companies reporting substantial cost savings and performance improvements by adopting heterogeneous cloud environments.
Intel Diamond Rapids to boost core counts to 192, but RIP Hyperthreading
Intel’s upcoming Diamond Rapids Xeon will boost core counts to 192, a 50 percent increase over last generation, the x86 giant revealed at Computex in Taipei this week. But while core counts continue to rise, in doing so Intel has managed to cut thread counts by a quarter. Yep, Hyperthreading – Intel's marketing for simultaneous multithreading – is officially dead.
A quantum metasurface breakthrough could finally close the terahertz gap
A quantum metasurface breakthrough could finally close the terahertz gap A quantum-powered metasurface breakthrough could finally make terahertz technology far more practical, sensitive, and widely usable. - Date: - May 31, 2026 - Source: - SPIE--International Society for Optics and Photonics - Summary: - Researchers have developed a compact quantum detector that makes terahertz radiation much easier to detect. A specially designed metasurface funnels incoming energy into tiny active...
Seattle is close to approving a year-long ban on large data centers
Seattle is close to approving a year-long ban on large data centers The mayor is expected to sign the moratorium soon. The Seattle City Council has unanimously approved a moratorium on the construction of new large AI data centers for one year. Mayor Katie Wilson has yet to sign it, but according to the Seattle Times, she was looking forward to doing so.
The best Qi2 batteries for iPhone and Pixel
Compact power banks have gotten a lot faster in the past year — and it’s not just their USB-C charging speeds that have received a boost. The newest Qi2.2-certified models can wirelessly charge an iPhone 16 or later at up to 25W. Combine that with their ability to magnetically snap on via MagSafe, and you’ve got yourself an essential add-on that’s easy to take on the go. Qi2 is a magnetic wireless charging standard that’s based on Apple’s MagSafe tech, so almost all modern iPhones support it.