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We are splitting our database into Main and CI
We are splitting our database into Main and CI to improve the scalability and reliability of GitLab.com.
New
The latest blog posts to take off on Hacker News. 6,947 posts.
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RISC-V is getting MSIs
Message signaled interrupts or MSIs describe a way to signal an interrupt without a dedicated interrupt request pin (IRQ). One of the most prevalent uses for MSIs is the PCI bus, and the PCI specification defines the MSI and MSI-X standards. The potential benefits may include: (1) reduced number of direct wires from…
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Improve Git monorepo performance with a file system monitor
Monorepo performance can suffer due to the sheer number of files in your working directory. Git’s new builtin file system monitor makes it easy to speed up monorepo performance.
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When network is faster than browser cache (2020)
We assume that browser caches are near-instantaneous, but data shows that retrieving an object from cache can take hundreds of milliseconds!
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tolower() in bulk at speed
DNS servers often have to convert DNS names to their canonical lower case form. BIND has to do so a bit more than most because it tries to preserve the case of DNS names rather than canonicalizing them.
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Linux commands for advanced hardware and system info
Sometimes you need info about hardware, and you probably lost your invoice, spec list or a password to a store website. Maybe you did an upgrade and this info isn't accurate anymore. It's an easy case for home users, but what to do is you have many machines
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Memory safety for the world’s largest software project
Rust for Linux and Prossimo The Rust for Linux project aims to bring a new system programming language into the Linux kernel. Rust has a key property that makes it very interesting to consider as the second language in the kernel: it guarantees no undefined behavior takes place (as long as unsafe code is sound)…
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What does an idle CPU do? (2014)
In the last post I said the fundamental axiom of OS behavior is that at any given time, exactly one and only one task is active on a CPU. But if there’s absolutely nothing to do, then what? It turns
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Hardening macOS
Quick and easy guide for securing macOS systems, for both laymen and security enthusiasts. Last updated for Golden Gate.
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Hardening the registers: A cascading failure of edge induced fault tolerance
An article by Anonymous : In 2017, Target announced that we had prioritized stores at the center of how we serve our guests – no matter how they choose to shop. To make this store-as-hubs model work, we spent several years redesigning operations and modernizing how we conduct business. We invested billions of dollars…
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JVM Anatomy Quark #10: String.intern (2019)
"JVM Anatomy Quarks" is the on-going mini-post series, where every post is describing some elementary piece of knowledge about JVM. The name underlines the fact that the single post cannot be taken in isolation, and most pieces described here are going to readily interact with each other.
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How we made data aggregation on PostgreSQL better and faster
They’re so fast we can’t catch up! Check out our benchmarks with two datasets to learn how we used continuous aggregates to make queries up to 44,000x faster.
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Cloudflare outage on June 21, 2022
Today, June 21, 2022, Cloudflare suffered an outage that affected traffic in 19 of our data centers
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Microvium Is Small
The Microvium JavaScript engine for microcontrollers takes less than 16 kB of ROM and 64 bytes of RAM per VM while idle, making it possibly the smallest JavaScript engine to date with more language features than engines 4x its size
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Linux Threat Hunting: ‘Syslogk’ a kernel rootkit found in the wild
Syslogk Rootkit Revealed: Analysis
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Text consoles and framebuffer consoles in Linux
You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…
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How we wound up with Linux's kernel mode setting ('KMS')
You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…
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Apple has a bug in its disk I/O throttling code that affects raw disk copies
Matt Jacobson, recovering software engineer.
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The computers are fast, but you don't know it
The computers are fast but you don't know it: Speeding up your Python functions with Cython & C++
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Exploiting a heap overflow in the FreeBSD wi-fi stack
In April of this year, FreeBSD patched a 13-year-old heap overflow in the Wi-Fi stack that could allow network-adjacent attackers to execute arbitrary code on affected installations of FreeBSD Kernel. This bug was originally reported to the ZDI program by a researcher known as m00nbsd and patched in
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No, QuestDB is not Faster than ClickHouse
telegra.ph/no-questdb-is-not-faster-than-clickhouse-06-152022144 points63 commentscited by 3Databases & Data details
QuestDB created a minor stir in the small but active world of analytics database benchmarking with this blog article: https://questdb.io/blog/2022/05/26/query-benchmark-questdb-versus-clickhouse-timescale. This is the money quote: “QuestDB is an order of magnitude faster than both TimescaleDB and ClickHouse in this…
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Retrofitting Temporal Memory Safety on C++
Eliminating use-after-frees vulnerabilities in Chrome with heap scanning.
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The hunt for a cluster-killer Erlang bug (2021)
A 20 minute Kafka outage brought down our entire Erlang cluster for hours. How could this happen? Follow this fascinating investigation!
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Everything Is Broken: Shipping Rust-Minidump at Mozilla
We've been working on the development of rust-minidump. The first in this two-part series explains what minidumps are and how we made rust-minidump.
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Fork() without exec() is dangerous in large programs (2016)
The UNIX fork() system call seems like an elegant way to process tasks in parallel. It creates a copy of the current process, allowing tasks to read the same memory, without needing fine-grained synchronization. Unfortunately, you need to use it extremely carefully in large programs because fork in a multi-threaded…
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LUMI, Europe’s most powerful supercomputer
LUMI is the first pre-exascale supercomputer of the EuroHPC Joint Undertaking and is now Europe’s most powerful supercomputer. It will be inaugurated on Monday 13 June 2022 in Kajaani. LUMI offers European researchers a world-class tool for understanding complicated phenomena, such as climate change. LUMI serves as a…