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Hidden dependencies in Linux binaries
I have recently released an open source tool called sotrace . It maps out the .so dependencies for a binary or library, and presents th...
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Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 569 posts.
482
Instrumenting Python GIL with eBPF
Learn how to measure the impact of Python GIL contention on application latency using eBPF, with real workload examples.
483
Decompiling Hyper-V Manager to rebuild it from source
This post guides through decompiling Hyper-V Manager to rebuild it from source, aiming to assess its value for potential open-sourcing. It explores manual and automated decompilation processes, including troubleshooting and enhancing the tool, advocating for community-led improvements to this widely-used but neglected…
484
Everything You Never Wanted to Know About Linker Script (2021)
Low level software usually has lots of .cc or .rs files. Even lower-level software, like your cryptography library, probably has .S containing assembly, my least favorite language for code review.
485
0x01 – Killing Windows Kernel Mitigations
This post was made possible through hard work and determination. Do not feel frustrated if this stuff does not click immediately and remember, the source of truth will always be the source code. For us, our source code is raw assembly. That said it’s important you understand these techniques in detail because when…
486
.NET on Linux: What a Contrast
Almost five years ago I wrote a brief history about .net on non-Windows platforms . I stumbled over that article now and it resurfaced traumatic memories of navigating .net development on Linux and MacOS.
487
How the Hourglass Won
The Internet's architecture is viewed as an hourglass: broad application support at the top, narrow waist (IP), wide choice of links below IP
488
The problem with invariants is that they change over time
Cliff L. Biffle blogged a great write-up of a debugging odyssey at Oxide with the title Who killed the network switch? Here’s the bit that jumped out at me: At the time that code was written…
489
Picking Glibc Versions at Runtime
Using a glibc version that is different from the system-provided one shouldn't require the use of containers, as I recently heard someone claim. Let's take a look at how dynamic linking works and what the options are.
490
Streaming joins are hard
Why are streaming joins so tricky? Discover the hidden complexities of real-time data, and learn how to tame the infinite stream!
491
Why good external SSDs are faster with Apple Silicon
Why an Intel Mac’s up to 40 Gb/s from Thunderbolt 3 is less than an Apple silicon Mac’s up to 40 Gb/s from USB4, and how you can benefit from it.
492
ARM64EC (and ARM64X) Explained
ARM64EC (and ARM64X) Explained Probably the most confused looks I get from other developers when I discuss Windows and ARM64 is when I used the term " ARM64EC ". They ask is the same thing as ARM64? Is it a different instruction set than ARM64? How can you tell if an application is or ARM64 ARM64EC?
493
Re-fixing Servo's event-loop
A follow-up on a previous story, in which we identify another problem, and perhaps confirm a theory through a theorem.
494
Improving Performance in Firefox and Across the Web with Speedometer 3
Today’s Speedometer release is more open and challenging than before and is the best tool for driving browser performance improvements.
495
Extending the context length to 1M tokens
API Documentation (Chinese) HuggingFace Demo ModelScope Demo Introduction After the release of Qwen2.5, we heard the community’s demand for processing longer contexts. In recent months, we have made many optimizations for the model capabilities and inference performance of extremely long context. Today, we are proud…
496
Nim on a Real-Time Operating System: Apache NuttX RTOS and Ox64 BL808 SBC
Let's blink an LED on Pine64 Ox64 BL808 64-bit RISC-V Single-Board Computer... With Nim Programming Language and Apache NuttX Real-Time Operating System
497
Prometheus metrics saves us from painful kernel debugging (2022)
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…
498
X is justifiably slow (2022)
I regularly hear or read statements like this: “X is slow but this is to be expected because it needs to do a lot of work”. It can be said about an application or a component in a larger system, and can refer to other resources that aren’t time. I often find these profoundly unhelpful as they depend much more on the…
499
Options for genuine ECC RAM on the desktop in (early) 2024
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…
500
When power cycling your (x86) server isn't enough to recover it
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…
501
Lessons from Ancient File Systems
In my previous post , I mentioned that I found a number of oddities when digging through the details of various Atari 8-bit file systems. I...
502
What is the best pointer tagging method?
In this post, we are going to take a deep dive into pointer tagging, where metadata is encoded into a word-sized pointer. Doing so allows us to keep a compact representation that can be passed around in machine registers. This is very common in implementing dynamic programming languages, but can really be used…
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Exponential Rate Limiting
Following my previous post on rate limiting with GCRA, leaky buckets without the buckets , I reviewed my old notes on rate limiting for Exim . I thought I should do a new write-up of the ideas that I hope will be more broadly interesting.
505
Review of Linux on Minisforum V3 AMD Ryzen Tablet
Update: I have created an awesome-minisforum-v3 GitHub repository to list information for Minisforum V3 users, including some workarounds for the issues mentioned in this review. Quest for the Ideal
506
Compilers are too smart
Last week I noticed some unexpected assembly code in a function calling std::unordered_map::find (yes, I know, friends don’t let friends use STL, but that is a topic for another discussion). I decided to investigate a bit and it turned out to be quite a journey. It was a Clang compiler, ARM-based platform, I will use…
507
A few facts about POSIX
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508
What's Inside a Linux Kernel Core Dump
An extremely thorough explanation of what's contained inside a Linux kernel core dump.
509
Self-contained Linux applications with lone Lisp
Creating standalone Linux applications with lone.
510
Speeding up the Rust edit-build-run cycle
There are two main aspects to compile times that matter to developers. Cold build times, when building from scratch and warm build times when you’ve already built and you’re rebuilding following an edit. This article focuses on warm build times, which for rapid iteration during development is what generally matters…