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  1. How exchanges turn order books into distributed logs from quant.engineering
    27 by rundef 5d ago | | |

    Article: 19 min

    The article discusses how exchanges transform order books into distributed logs to ensure fairness in high-frequency trading by maintaining a deterministic sequence of events. It explains the challenges of ordering chaos caused by concurrent events from different gateways, data centers, and continents, and presents the solution of using event sourcing at the nanosecond scale with a sequencer component that assigns monotonically increasing sequence numbers to every market event.

    The deterministic ordering ensures fairness and integrity in financial markets, which can lead to more reliable investment decisions and reduced market manipulation risks.
    • Exchanges operate under demanding real-time constraints to ensure fairness and integrity of market events.
    • Event sourcing at the nanosecond scale ensures determinism, fairness, and predictability in high-frequency trading systems.
    Quality:
    The article provides a detailed explanation of the technical concepts involved in high-frequency trading systems, making it suitable for professionals with a background in finance and computer science.

    Discussion (14): 6 min

    The comment thread discusses various aspects of exchange architectures, focusing on the sequencing step and its potential for parallel processing to reduce latency. It also touches on real-world examples of exchange outages and the role of incentives in shaping exchange operations.

    • Exchanges can use horizontal scaling through sharding
    • Components outside of the sequencer can be scaled more easily
    • Replaying and reprocessing messages after a crash takes substantial time
    • The sequencing step is minimal, allowing for some parallelism
    Counterarguments:
    • The vast majority of orders are likely on liquid symbols near the top of the book, making parallel processing less impactful.
    • Exchanges turn distributed logs into order books, not the other way around.
    • Parallelism is feasible by sharding across order books themselves, but the pipeline depth limits this.
    Finance Trading Systems
  2. macOS 26.2 enables fast AI clusters with RDMA over Thunderbolt from developer.apple.com
    454 by guiand 17h ago | | |

    Article:

    The article discusses how macOS 26.2 facilitates quick AI cluster setups through RDMA over Thunderbolt technology.

    • Enhanced performance in AI applications
    • Improved data transfer speed between devices
    Quality:
    The article provides factual information without bias.

    Discussion (236): 41 min

    The comment thread discusses various aspects of macOS, including HDR display support, AI research capabilities on Apple hardware, and the comparison between macOS and Linux for specific tasks. Users debate about the intended behavior of macOS when using HDR mode with non-Apple monitors, the benefits of Linux for HDR calibration, and the performance implications of Tensor parallelism in AI applications. The thread also touches upon RAM pricing trends and the potential for Apple to dominate the AI appliance market.

    • HDR support on macOS can be problematic with non-Apple monitors
    • Linux offers better HDR calibration and maintains black levels well
    • Tensor parallelism in MLX can offer significant speedup when using multiple machines
    Counterarguments:
    • macOS has intended behavior for monitor limited in peak brightness when using HDR mode
    • RAM prices are expected to decrease over time, making high-end hardware more affordable
    Computer Science Operating Systems, Computer Vision
  3. Java FFM zero-copy transport using io_uring from mvp.express
    9 by mands 5d ago | |

    Article: 5 min

    MYRA STACK is a modern, native-speed Java infrastructure built on FFM API for memory-yielded and rapid access. It includes components like Roray-FFM-Utils for memory management, MyraCodec for schema-driven serialization, MyraTransport for high-performance networking with io_uring, MVP.Express RPC for advanced RPC services, and JIA-Cache as an off-heap distributed cache.

    • No Unsafe or JNI
    • Schema-driven serialization
    • Off-heap distributed cache
    Quality:
    The article provides clear, technical information without exaggeration or misleading claims.

    Discussion (2):

    The comment thread discusses the roundtrip latency in zero copy IPC, questioning its cause and implications. It involves technical inquiries about latency measurement, process communication mechanisms, and kernel components.

    • What is causing this overhead?
    Software Development Java, Networking, Serialization, Distributed Caching
  4. We built another object storage from fractalbits.com
    12 by fractalbits 1h ago | |

    Article: 12 min

    The article discusses the challenges and limitations of existing high-performance object storage solutions in the market. It highlights how these systems are unable to provide affordable performance at scale due to pricing models that make them prohibitively expensive for applications with high IOPS requirements. The author introduces FractalBits, a new object storage solution designed to address this issue by offering high IOPS at an affordable cost and incorporating native directory semantics.

    FractalBits addresses the issue of high-performance object storage solutions being too expensive for modern applications, potentially leading to more affordable and scalable data infrastructure in cloud computing.
    • Traditional object storage systems prioritize cost over performance, leading to limitations in modern AI, analytics, and cloud-native applications.
    • FractalBits is introduced as a solution that aims to provide high IOPS at an affordable price while incorporating native directory semantics for better scalability and performance.
    • The article includes benchmarks showing the performance of FractalBits compared to existing solutions like AWS S3 Express One Zone.

    Discussion (1):

    More comments needed for analysis.

    Cloud Computing Object Storage
  5. Photographer built a medium-format rangefinder, and so can you from petapixel.com
    66 by shinryuu 6d ago | |

    Article: 7 min

    Photographer Albert Cornelissen built a medium-format rangefinder camera, the MRF2, using microelectronics and software. The project is open-source, allowing anyone to access 3D-printable files and instructions for building their own version.

    The open-source nature of the project encourages collaboration and innovation within the DIY camera community, potentially leading to more accessible and affordable medium-format photography options.
    • Albert Cornelissen built the MRF2 camera for medium-format photography.
    • The project is open-source, with 3D-printable files and instructions available on Github.
    • The camera uses microelectronics and software to function as a modern lens-coupled, LiDAR-powered rangefinder.

    Discussion (7): 3 min

    The discussion revolves around the cost-effectiveness of a DIY interchangeable lens medium-format rangefinder compared to used cameras, with opinions on the value and alternatives for those interested in medium-format photography.

    • The cost of the interchangeable lens MF rangefinder is reasonable.
    Counterarguments:
    • Used Xpans (with an unknown electronic lifespan) are commonly selling for in excess of $7k.
    DIY/Do-It-Yourself Photography, Electronics
  6. Sick of smart TVs? Here are your best options from arstechnica.com
    399 by fleahunter 1d ago | | |

    Article: 38 min

    The article provides a guide to finding non-smart TVs or alternative methods to watch TV without smart features. It highlights the benefits of using an Apple TV box for privacy and reliability, discusses the scarcity of dumb TVs due to industry trends, and offers recommendations on various options like Emerson, Westinghouse, Sceptre, projectors, computer monitors, digital signage displays, phones, laptops, home theater PCs, antennas, and NAS devices. The guide also covers considerations when connecting these alternatives to a TV.

    Quality:
    The article provides a comprehensive guide with detailed information and recommendations, avoiding sensational language.

    Discussion (346): 1 hr 7 min

    The discussion revolves around concerns regarding privacy and user experience with smart TVs. Users advocate for disconnecting smart TVs from the internet or using alternatives like Apple TV, citing issues such as nagging notifications and privacy leaks. There is a consensus on the lack of good non-smart TVs in the market and calls for TV manufacturers to provide customizable options. Technical discussions include display technologies, hacking capabilities, and alternative usage models.

    • Smart TVs should be disconnected from the internet
    • TV manufacturers should provide 'dumb' TV options
    Consumer Electronics , Consumer Privacy
  7. A 'toaster with a lens': The story behind the first handheld digital camera from bbc.com
    33 by selvan 5d ago | | |

    Article: 40 min

    The article discusses the invention of the first handheld digital camera by Steve Sasson in 1975, and its impact on photography. The story highlights how Sasson's innovative idea was developed using existing technologies like charge-coupled devices (CCDs) and integrated circuits, and how it eventually led to the creation of consumer digital cameras.

    Digital photography has transformed how people capture and share memories, leading to advancements in technology, changes in consumer behavior, and new industries such as digital photo editing and online sharing platforms.
    • Steve Sasson's inspiration from Star Trek
    • Development using existing technologies like CCDs and integrated circuits
    • Initial challenges in assembling the device
    • First picture taken without film
    • Impact on Eastman Kodak management and industry
    Quality:
    The article provides a detailed and balanced account of the invention, with credible sources.

    Discussion (13): 2 min

    The comment thread discusses the downfall of Kodak, focusing on their invention of digital photography and its role in their decline. It also touches upon the impact of acquisitions and the common story of companies being 'bought out' to grow or eliminate competition.

    • Kodak's invention of digital photography was not the sole reason for their downfall
    Counterarguments:
    • The company's acquisition by a public company led to its decline
    Technology Computer Science, Innovation, Photography
  8. Germany's train service is one of Europe's worst. How did it get so bad? from npr.org
    36 by pseudolus 2h ago | | |

    Article: 8 min

    The article discusses the decline in punctuality and reliability of Germany's Intercity Express train service, which is now among Europe's least punctual. Chronic underinvestment, bureaucratic processes, and an overly top-heavy management structure are identified as key factors contributing to the problems faced by state-owned Deutsche Bahn.

    Germany's train service decline may affect public trust in the transportation system and influence future investment decisions in railway infrastructure.
    • Germany's railway Deutsche Bahn's long-distance 'high-speed' trains are among the least punctual in Europe.
    • The government has announced a 100-billion-euro investment in rail infrastructure.
    • Upper management allegedly approves canceling long-distance trains to boost punctuality ratings.
    Quality:
    The article presents factual information without a strong bias.

    Discussion (26): 7 min

    The comment thread discusses various aspects of Germany's transportation system, particularly focusing on Deutsche Bahn's train reliability and service quality. There is a debate between the cost-effectiveness of car ownership versus public transport in Germany, with comparisons to American systems. The discussion also touches upon the impact of regional differences and bureaucratic structures within the German healthcare sector.

    Counterarguments:
    • Criticism of Deutsche Bahn's service quality
    • Discussion on the cost-effectiveness of public transport vs car ownership in densely populated areas
    • Comparison with Flixbus reliability
    Transportation Railway Systems
  9. Apple has locked my Apple ID, and I have no recourse. A plea for help from hey.paris
    716 by parisidau 9h ago | | |

    Article: 9 min

    A loyal customer of 30 years has been locked out of their Apple ID due to an issue with a recent $500 Apple Gift Card redemption attempt at a major retailer. The account was flagged as 'closed in accordance with the Apple Media Services Terms and Conditions', resulting in the loss of access to iCloud, devices, software, and media worth over $30,000.

    • 30-year loyal customer
    • Permanent account lockout
    Quality:
    The article is a plea for help, not an investigative piece.

    Discussion (385): 1 hr 32 min

    The discussion revolves around a user's experience with Apple account bans following suspicious activity related to gift card usage. Users express frustration, concern over data loss, and the need for alternative backup solutions or self-hosted platforms as they feel large tech companies do not prioritize customer satisfaction. There is also a call for regulation to protect consumers from potential risks associated with centralized services.

    • Apple's actions resulted in significant inconvenience and loss for the user, including access to purchased software and media.
    • Users are concerned about the lack of transparency from Apple regarding account bans.
    • There is a growing sentiment against relying on cloud services due to potential risks like data loss or denial of service.
    Counterarguments:
    • Some users argue that owning one's data and hardware is crucial, suggesting a shift away from cloud services.
    • Others suggest the need for self-hosted solutions or alternative platforms as a way to mitigate risks associated with centralized services.
    Consumer Issues Tech Support Disputes, Customer Service Failures
  10. GNU Unifont from unifoundry.com
    283 by remywang 17h ago | | |

    Discussion (67): 12 min

    The comment thread discusses GNU Unifont, a bitmap font with glyph support for every Unicode code point, and its usage in commercial non-free software. Opinions vary on its suitability for specific scripts and its overall aesthetic appeal.

    • GNU Unifont provides a fixed glyph for every Unicode code point
    • Unifont can be used in commercial non-free software
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