2971
Gitfs: Version Controlled File System
gitfs went on a trip around the world, and we were there to document it: fro Italy to Sweden, from the UK to Spain, gitfs has been center stage.
New
The latest blog posts to take off on Hacker News. 6,947 posts.
2972
A 5x reduction in RAM usage with Zoekt memory optimizations
Recently, we've been working to scale Sourcegraph cloud's index to 1 million open source repositories and beyond. Part of that effort has been reducing the RAM usage for the Zoekt (pronounced "zooked") servers responsible for handling most of our code searches.
2973
LLVM Internals: The Bitcode Format
I’ve done a couple of posts on LLVM itself, mostly on things you can do with LLVM or how LLVM represents particular program features.
2974
How Does FaceTime Work?
As an ex-pat living in Denmark, I use FaceTime audio a lot. Not only is it simple to use and reliable, but the sound quality is incredible. For those of you old enough to remember landlines, it reminds me of those but if you had a good headset. When
2975
Performance Improvements in .NET 6
Take a rip-roarin' tour through hundreds of PRs worth of performance improvements for .NET 6.
2976
2977
2978
The Wendelstein 7-X concept proves its efficiency
One of the most important optimisation goals underlying the Wendelstein 7-X fusion device at Max Planck Institute for Plasma Physics in Greifswald has now been confirmed. An analysis by IPP scientists in the journal Nature shows: In the optimised magnetic field cage, the energy losses of the plasma are reduced in the…
2979
Speeding up atan2f
`atan2f` is an important but slow trigonometric function. In this article we'll explain how to approximate it, and implement a version 50x faster than `glibc` on batches of inputs.
2980
Exploring Clang/LLVM optimization on programming horror
Recently, I’ve come across a not so efficient implementation of a isEven function (from r/programminghorror ).
2981
2982
EC2 Boot Time Benchmarking
Once I finished writing ec2-boot-bench, the natural next step was to run some tests — in particular, to see how FreeBSD compared to other operating systems used in EC2. I used the c5.xlarge instance type and tested FreeBSD releases since 11.1-RELEASE (the first FreeBSD release which can run on the c5.xlarge instance…
2983
You can list a directory containing 8M files, but not with ls
I needed to list all files in a directory, but ls , find , and os.listdir all hung. This is my story.
2984
Why query planning for streaming systems is hard
Many groups are working on running sql queries in incremental/streaming systems . Query planning in this context is not a well understood problem. This post is a quick pointer towards the many open problems. It's not intended to be complete or authoritative, because I haven't engaged with the problem much beyond…
2985
Asahi Linux for Apple M1 progress report, August 2021
Porting Linux to Apple Silicon
2986
Dealing with Out-of-Memory Conditions in Rust
In this post, CrowdStrike's Engineering team walks through one possible way of adapting a library to handle OOM events without aborting the process.
2987
C++ Exceptions: Under the Hood (2013)
Index A tiny ABI An ABI to appease the linker Catching what you throw Magic around __cxa_begin_catch and __cxa_end_catch Gcc...
2988
Intel C/C++ compilers complete adoption of LLVM
Find software and development products, explore tools and technologies, connect with other developers and more. Sign up to manage your products.
2989
Kernel Pwning with eBPF: A Love Story
How are low-level vulnerabilities exploited and detected in the modern age? This expert guide walks you through the ins and outs of eBPF and Kernel security.
2990
The macOS Sandbox File Limit
There has recently been some renewed discussion on Twitter about the limitation that the macOS sandbox places on the number of open files an app can access at once. Apps are still running into problems because of this limitation, and there is not a lot of technical detail available on it outside of Apple, so I’d like…
2991
Increase HTTP performance by fitting in the initial TCP slow start window
Did you know that if your site’s under ~12kb the first page will load significantly faster? Servers only send a few packets (typically 10) in the initial round-trip while TCP is warming up (referred to as TCP slow start). After sending the first set of packets, it needs to wait for the client to acknowledge it…
2992
2993
Slitter: A slab allocator that trusts, but verifies
Slitter is Backtrace’s deliberately middle-of-the-road thread-caching slab allocator, with explicit allocation class tags (rather than derived from the object’s size class). It’s mostly written in Rust, and we use it in our C backend server. Slitter’s design is about as standard as it gets: we hope to dedicate the…
2994
Simple Systems Have Less Downtime (2020)
The Maersk Triple-E Class container ship is 1,300 feet long, carries over 18,000 containers across 11,000 miles between Europe and Asia, and… Its entire crew can fit inside a passenger van. As a former naval architect and a current marketing consultant to startups, I found that
2995
Leap seconds: Causing bugs even when they don’t happen
Some new minor leap second drama is coming up, and for once we can
2996
How to write slow Rust code
I have recently published a blog post that, as I had expected (actually, hoped for, as that would attract people to contribute to the “study”), generated quite some polemic on the Internet!
2997
Let’s Talk OpenZFS Snapshots
Optimize OpenZFS snapshots. Learn which data benefits from snapshots, how long to keep them, and how to avoid performance bottlenecks.
2998
Docker in Production: A History of Failure (2016)
Introduction My first encounter with docker goes back to early 2015. Docker was experimented with to find out whether it could benefit us. At the time it wasn’t possible to run a container [i…
2999
IBM Z/OS v2.5, Next-Gen Operating System Designed for Hybrid Cloud and AI
IBM announced IBM z/OS V2.5, the next-generation operating system (OS) for IBM Z, designed to accelerate client adoption of hybrid cloud and AI and drive application modernization projects.
3000
Finding Windows HANDLE leaks, in Chromium and others
Three years ago I found a 32 GB memory leak caused by CcmExec.exe failing to close process handles. That bug is fixed, but ever since then I have had the handles column in Windows Task Manager ena…