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Zaplib post-mortem
Welp, this is a weird blog post! Very unexpectedly, we quickly invalidated some of the core hypothesis that make Zaplib work as a startup.
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 6,943 posts.
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Mysql "Swap Insanity"
Update: Also read A brief update on NUMA and MySQL. The “swap insanity” problem, in brief When running MySQL on a large system (e.g., 64GB RAM and dual quad core CPUs) with a large Inno…
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Modern text rendering with Linux: Part 1
Introduction
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Writing a bare-metal RISC-V application in D
This post will show you how to use D to write a bare-metal “Hello world” program that targets the RISC-V QEMU simulator. In a future blog post ( now available ) we’ll build on this to target actual hardware: the VisionFive 2 SBC. See blog-code for the final code from this post. For a more complex example, see…
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RETRO is fast
When I first read Google’s RETRO paper, I was skeptical. Sure, RETRO models are 25x smaller than the competition, supposedly leading to HUGE savings in training and inference costs. But what about the new trillion token “retrieval database” they added to the architcture? Surely that must add back some computational…
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Intel 80386, part 1: Introduction
Practical development throughout the evolution of Windows.
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Cranelift, Part 2: Compiler Efficiency, CFGs, and a Branch Peephole Optimizer
This post is the second in a three-part series about Cranelift . In the first post , I described the context around Cranelift and our project to replace its backend code-generation infrastructure, and detailed the instruction-selection problem and how we solve it. The remaining two posts will be deep-dives into some…
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Memory-Level Parallelism: Intel Skylake versus Apple A12/A12X
Modern processors execute instructions in parallel in many different ways: multi-core parallelism is just one of them. In particular, processor cores can have several outstanding memory access requests "in flight". This is often described as "memory-level parallelism". You can measure the level of memory-level…
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Firecracker: Lightweight Virtualization for Serverless Applications
Serverless containers and functions are widely used for deploying and managing software in the cloud. Their popularity is due to reduced cost of operations, improved utilization of hardware, and faster scaling than traditional deployment methods. The economics and scale of serverless applications…
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Digging into Linux namespaces – part 1
Process isolation is a key component for containers. One of the key underlying mechanisms are namespaces. We will explore what they are, and how they work, to build our own isolated container and better understand each piece.
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Allocator Designs
This post explains how to implement heap allocators from scratch. It presents and discusses different allocator designs, including bump allocation, li…
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Blocking code is a leaky abstraction
Asynchronous code does not require the rest of your code to be asynchronous. I can’t say the same for blocking code.
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A timesyncd failure and systemd's lack of debugability
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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Freenet build 1495: new user experience and performance
Hyphanet is a peer-to-peer platform for censorship-resistant communication and publishing.
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Beating the Compiler
An oft-repeated fact on programming forums these days is that a decent optimizing compiler will always beat a puny human's attempt at hand-written assembler. There are rare cases, like MPEG decoders, where making good use of the SIMD instructions can allow assembly to massively beat the compiler. But generally you'll…
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A look at home routers, and a surprising bug in Linux/MIPS
Xôi Lạc TV là địa chỉ theo dõi bóng đá trực tuyến được người dùng đánh giá cao. Với hàng loạt giải đấu được phát sóng miễn phí cùng nhiều thông tin được cập nhật như lịch thi đấu, kết quả, bảng xếp hạng, tỷ số và những tin tức thể thao đáng chú ý.
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My favorite bug: segfaults in Java
Update: Two years later, I wrote a more detailed version of this article: My favorite bug: segfaults in Java (redux) .
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All GB/s without FLOPS – Nvidia CMP 170HX Review
This article contains a basic Nvidia CMP 170HX performance overview, a performance lockdown workaround, a hardware teardown, a watercooling installation guide, and a repair log.
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DWARF-Based Stack Walking Using eBPF
Deep dive into the new DWARF-based stack unwinder using eBPF.
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Rust in illumos
Systems engineering, Rust development, and Unix infrastructure by Till Wegmüller (@toasterson)
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NeXTSTEP on the HP 712 Part 1: Installation
It’s been a long time since my last pizzabox post - over a year! There’s been a lot going on in my life but I’m excited that lately I’ve had a lot more free time , which means more time to explore the world of workstations and share with you!
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Compiler Bugs Found When Porting Chromium to VC++ 2015
Moving a big software project to a new compiler can be a lot of work, and few projects are bigger than Chromium. In addition to the main Chromium repository, which includes all of Blink, there are …
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