@azonenberg@ioc.exchange2026-04-19 06:50:02
Shut down one of my Ceph nodes to add a 100G NIC to it. It came back up fine after the reboot.
But three of my workstations simultaneously had a kernel crash (likely related) with a bunch of cores pegged at 100% cpu followed by a lockup so hard i had to hit the power button.
One of them came back up fine. One is hanging during POST. Another is boot looping. WTF??
@chiraag@mastodon.online2026-03-20 23:32:22
@Techmeme@techhub.social2026-02-12 12:46:00
A profile of Applied Intuition, which makes self-driving simulation software and reported $800M in 2025 revenue and 80% gross margins, as it expands beyond cars (Iain Martin/Forbes)
https://www.forbes.com/sites/iainmartin/20…
@arXiv_physicsaccph_bot@mastoxiv.page2026-02-17 09:30:14
Experimental Validation of HomHBFEM Simulations of Fast Corrector Magnets for PETRA IV
Jan-Magnus Christmann, Laura Anna Maria D'Angelo, Herbert De Gersem, Sven Pfeiffer, Sajjad Hussain Mirza, Adeel Amjad, Lucas Rousselange, Matthias Thede
https://arxiv.org/abs/2602.14824 https://arxiv.org/pdf/2602.14824 https://arxiv.org/html/2602.14824
arXiv:2602.14824v1 Announce Type: new
Abstract: This paper presents experimental validation of the homogenized harmonic balance finite element method (HomHBFEM), which we have developed as a dedicated simulation technique for magnets with fast excitation cycles, in particular the fast corrector (FC) magnets for PETRA IV at DESY. The HomHBFEM allows efficient three-dimensional nonlinear eddy-current simulations of laminated magnets at elevated frequencies with a relatively coarse finite element (FE) mesh and without computationally expensive time-stepping. This is achieved by combining a frequency-domain-based homogenization technique with the harmonic balance FE method. The simulation results for the magnetic flux density along the axis of the FC magnets as a function of frequency and the resulting integrated transfer function (ITF) are compared to Hall probe and search coil measurements of the first prototype FC magnet for PETRA IV. A good agreement between simulated and measured ITFs is achieved for excitation frequencies from 10 Hz to 10 kHz.
toXiv_bot_toot
@arXiv_csGR_bot@mastoxiv.page2026-02-02 08:39:29
HeatMat: Simulation of City Material Impact on Urban Heat Island Effect
Marie Reinbigler, Romain Rouffet, Peter Naylor, Mikolaj Czerkawski, Nikolaos Dionelis, Elisabeth Brunet, Catalin Fetita, Rosalie Martin
https://arxiv.org/abs/2601.22796 https://arxiv.org/pdf/2601.22796 https://arxiv.org/html/2601.22796
arXiv:2601.22796v1 Announce Type: new
Abstract: The Urban Heat Island (UHI) effect, defined as a significant increase in temperature in urban environments compared to surrounding areas, is difficult to study in real cities using sensor data (satellites or in-situ stations) due to their coarse spatial and temporal resolution. Among the factors contributing to this effect are the properties of urban materials, which differ from those in rural areas. To analyze their individual impact and to test new material configurations, a high-resolution simulation at the city scale is required. Estimating the current materials used in a city, including those on building facades, is also challenging. We propose HeatMat, an approach to analyze at high resolution the individual impact of urban materials on the UHI effect in a real city, relying only on open data. We estimate building materials using street-view images and a pre-trained vision-language model (VLM) to supplement existing OpenStreetMap data, which describes the 2D geometry and features of buildings. We further encode this information into a set of 2D maps that represent the city's vertical structure and material characteristics. These maps serve as inputs for our 2.5D simulator, which models coupled heat transfers and enables random-access surface temperature estimation at multiple resolutions, reaching an x20 speedup compared to an equivalent simulation in 3D.
toXiv_bot_toot
@Techmeme@techhub.social2026-04-03 05:21:49
Matt Mullenweg says EmDash, while open source, is designed "to sell more Cloudflare services" and lacks the cross-platform democratization of WordPress (Matt Mullenweg)
https://ma.tt/2026/04/emdash-feedback/
@MolemanPeter@neuromatch.social2026-02-27 08:52:55
The abstract capacity to consciously predict, simulate, and actively prepare for an uncertain future can be argued to be humanity’s primary adaptive strength. However, and perhaps uniquely, it also carries with it the existential certainty of inevitable mortality...
Dor-Ziderman Y, Schweitzer Y, Nave O, Trautwein F-M, Fulder S, Lutz A, et al. (2025): Training the embodied self in its impermanence: meditators evidence neurophysiological markers of death acceptance. Neuroscience of Consc…
@azonenberg@ioc.exchange2026-03-05 23:52:30
Debating swapping another 1630 into the VM server when I revamp it since I've had better luck with it in PCIe passthrough than the AMD cards.
I guess the next question is which VM should get it.
The apple silicon platfom its its own thing.
The Debian stable and win11 builders will definitely get GPUs but which other node?
Also i may not have enough cores to run all of the builders simultaneously if I give them 16 vCPUs each. So i can cut them down to 4 or 8 each, …
@gwire@mastodon.social2026-02-04 15:09:25
This Chornobyl/Hairdresser game bundle feels a bit Barbenheimer.
https://store.playstation.com/en-gb/product/HP6961-PPSA25715_00-0468120727725986
@Techmeme@techhub.social2026-02-25 12:56:17
A study finds GPT-5.2, Claude Sonnet 4, and Gemini 3 Flash deployed tactical nuclear weapons in 95% of 21 simulated war game scenarios, and never surrendered (Chris Stokel-Walker/New Scientist)
https://www.newscientist.com/article/25168
