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Microservices
Defining the microservices architectural style by describing their nine common characteristics
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 4,390 posts.
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Loading NumPy arrays from disk: mmap() vs. Zarr/HDF5
Learn how to load larger-than-memory NumPy arrays from disk using either mmap() (using numpy.memmap), or the very similar Zarr and HDF5 file formats.
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Pause/unpause any X11 application
Many desktop oriented operating systems try to provide various usability improvements and features, like quite useful Expose or Dashboard in Mac OS X or useless Tiles concept in recent editions of …
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Computing at scale, or, how Google has warped my brain
A number of people at Google have stickers on their laptops that read "my other computer is a data center." Having been at Google for almost...
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A Base Filesystem Project for macOS
OK9 là nền tảng giải trí và cá cược trực tuyến với hệ thống sản phẩm đa dạng, bao gồm thể thao, live casino, slot game, bắn cá, xổ số và game bài.
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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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Dissecting the CPU-memory relationship in garbage collection (OpenJDK 26)
The author of Java 26's MemoryMXBean.getTotalGcCpuTime() analyzes the CPU-memory trade-off and why pause times fail to capture explicit GC cost.
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JVM Garbage Collectors Benchmarks Report
The current article describes a series of Java Virtual Machine (JVM) Garbage Collectors (GC) micro-benchmarks and their results, using a different set of patterns. For the current issue, I included all Garbage Collectors from AdoptOpenJDK 64-Bit Server VM version 13 (build 13+33) :
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Linux kernel heap quarantine versus use-after-free exploits
It's 2020. Quarantines are everywhere – and here I'm writing about one, too. But this quarantine is of a different kind. In this article I'll describe the Linux Kernel Heap Quarantine that I developed for mitigating kernel use-after-free exploitation.
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Sometimes Kill -9 Isn't Enough
If there’s one thing to know about distributed systems, it’s that they have to be designed with the expectation of failure. It’s also safe to say that most software these days is, in some form, distributed—whether it’s a database, mobile app, or enterprise SaaS. If you have two different processes talking to each…
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Smaller than Bloom filters
I've been looking at what would be needed in order to have a global view of CRLs in browsers. At the moment revocation has three problems: privacy (by asking the CA about the status of a certificate you're revealing to them what you're looking at), performance (OCSP checks take hundreds of milliseconds which adds up…
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Process behaviour anomaly detection using eBPF and unsupervised learning
Hello everybody, I hope you’ve been enjoying this summer after two years of Covid and lockdowns :D In this post I’m going to describe how to use eBPF syscall t…
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LLVM internals, part 4: attributes and attribute groups
This is the last post I plan to do on parsing LLVM’s bitcode, at least for a while. I’ll keep working on the various libraries that I’ve started under the mollusc umbrella, but they won’t be accompanied by regular posts anymore — I’d like to refocus on writing smaller, less dense (read: lower-pressure) posts for a…
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Build a simple LSM-Tree storage engine in a week
A hands-on introduction to database internals. Build an LSM storage engine with SSTables, compaction, WAL recovery, MVCC, and transactions.
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What I think what we need to do to keep FreeBSD relevant (2019)
Since I participate in the FreeBSD project there are from time to time some voices which say FreeBSD is dead, Linux is the way to go. Most of the time those voices are trolls, or people which do not really know what FreeBSD has to offer. Sometimes those voices wear blinders, they only see their
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We're moving away from swap partitions on our Linux servers
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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Why collision avoidance is harder for an AI-based system
Recent incident where Uber car was involved in an accident where a cyclist got killed has sparked many comments and opinions. Many blame…
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A bit of XENIX history (2014)
Retrocomputing and other indulgences
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MutexProtected: A C++ Pattern for Easier Concurrency
In this post, we will discuss the challenges of programming with locks and how the C++ language offers some useful tools to make it easier. We will start with an example in C and then use C++ to improve upon it in steps. The example APIs are based on real-life APIs from the SerenityOS kernel.
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Why can’t you just roll back from a bad macOS update?
If it’s so easy to uninstall a troublesome RSR, why can’t we simply roll back to a previous version of macOS, like we did in High Sierra?
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The Move from Linux to FreeBSD
About 2 months ago, I had a spare VPS at my host, Hetzner. So I decided to play with FreeBSD which was being offered for Hetzner servers and VPSes.That’s how the whole thing started. I didn’t have much problems getting the concepts because it belongs to *nix family of OSes [...]
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OpenBSD is a cozy operating system
With the recent release of OpenBSD 7.5, I decided to run through my personal OpenBSD “installer” for laptop/desktop devices. The project is built off of the dwm tiling window manager and only installs a few basic packages. The last time I updated it was with the release of 7.3, so it’s been due for an minor rework.
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Booting an M1 Mac from an external disk
If you’ve been unable to create a bootable external disk to use with your M1 Mac, this explains what you need and its limitations and quirks.
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The costs of the i386 to x86-64 upgrade
If you read my previous article on DOS memory models, you may have dismissed everything I wrote as “legacy cruft from the 1990s that nobody cares about any longer”. It's time to see how any of that carried over through the 16-bit to 64-bit evolution.