5551
Why is calling my asm function from Rust slower than calling it from C?
This is a follow-up to making the rav1d video decoder 1% faster, where we compared profiler snapshots of rav1d (the Rust implementation) and dav1d (the C …
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 6,943 posts.
5552
Linux memory manager and your big data
Citus gives you all the greatness of Postgres plus the superpowers of distributed tables. By distributing your data and queries, your application gets high performance—at any scale. The Citus database is available as open source and as a managed service on Azure.
5553
Would we still create Nebula today?
Spoiler: Yes. (But the "why" matters. A lot.)
5554
ReactOS 0.4.3 Released
ReactOS is a free, opensource reimplementation of windows
5555
Thermal Testing Raspberry Pi 4
Raspberry Pi 4 just got a lot cooler! The last four months of firmware updates have taken over half a watt out of idle power and nearly a watt out of fully loaded power
5556
Beamforming in PulseAudio
In case you missed it – we got PulseAudio 9.0 out the door , with the echo cancellation improvements that I wrote about . Now is probably a good time for me to make good on my promise to expand upon the subject of beamforming.
5557
Fast Shadow Stacks for Go
tl;dr : Software shadow stacks could deliver up to 8x faster stack trace capturing in the Go runtime when compared to the frame pointer unwinding that landed in go1.21. This doesn’t mean that this idea should escape from the laboratory right away, but it offers a fun glimpse into a potential future of hardware…
5558
Debugging using system calls in Mac OS X
Today I want to talk about an issue I was having with UDP sockets in Go, and how I learned more about my program by making use of two tools that ship with Mac OS X called dtruss, and DTrace.
5559
How to Understand Systems
Solving problems by identifying underlying systems
5560
5561
Almost booting an iOS kernel in QEMU
I tried to boot an iOS 12 kernelcache in QEMU: I managed to get as far as IOKit startup before receiving a kernel panic. I learned a lot about how iOS boots up with this project.
5562
Box86/Box64 vs. QEMU vs. FEX (Vs Rosetta2)
Comparing performances I decided to compare the performances of the OpenSource Linux Userspace Emulator that allows you to run x86/x86_64 apps on ARM linux. There are QEMU-user, FEX-emu and Box86/Box64. How to bench Linux userspace emulator Test will consist of the bench I already used a couple of time, and that can…
5563
Low-level x86 code compression for 64k intros
This is about the “secret ingredient” in my EXE packer kkrunchy, which was used in our (Farbrausch) 64k intros starting from “fr-030: Candytron”, and also in a lot of other …
5564
Reverse-engineering Rosetta 2 Part 1: Analyzing AoT files and the runtime
Apple announced that it would be moving from Intel processors to Arm-based Apple Silicon CPUs for Macs at WWDC 2020. The Apple Silicon-based Mac Book Air and Pro were released in October 2020 with great fanfare.
5565
Exploiting Windows 10 in a Local Network with WPAD/PAC and JScript
by Ivan Fratric, Thomas Dullien, James Forshaw and Steven VittitoeIntroMany widely-deployed techn...
5566
Upgrading my Chumby 8 kernel part 10: RTC
I’m going to start this post off with the obligatory list of links to the previous parts in the series if you’re new here and are interested in seeing the full story: 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , and 9 . This is the tale of how I upgraded my Chumby 8 to run a modern Linux kernel.
5567
Haiku's (Kernel) Condition Variables API: Design and Implementation
A few months after my contract with Haiku, Inc. began, I rewrote the implementation of the Haiku kernel’s condition variables (as opposed to our userspace condition variables, which are from POSIX.) As this new implementation has run in Haiku …
5568
MRI's Method Caches
One of MRI's big performance problems is that method cache expiry is global. That is, any time you make a change to any class anywhere, the entire VM's method caches get busted at the same time. This is why you'll frequently hear people saying that "calling Object#extend is bad".
5569
Optimized Go gzip/zip packages, 30-50% faster
I have worked on optimizing the standard library deflate function, and I am happy to announce revised gzip/zip packages, that on x64 is about 30-50% faster with slightly improved compression. Project: https://github.com/klauspost/compress All packages are drop-in replacements for the standard libraries, so you can use…
5570
5571
The Importance of End-to-End Thinking in System Design
I once attended a talk by Yoky Matsuoka when I was young – so young, in fact, that I don’t remember when or where the talk was. What I do remember is her telling the story of designing…
5572
Progressive Locks: fast, upgradable read/write locks
Context A few years after I created the Elastic Binary Trees (ebtree) , I started to get some feedback from users who needed to use the...
5573
How many registers does an x86-64 CPU have?
x86 is back in the general programmer discourse, in part thanks to Apple’s M1 and Rosetta 2 . As such, I figured I’d do yet another x86-64 post.
5574
Don’t Be Afraid of RAID
I sense this sentiment on the internet that RAID is dangerous, that the likelihood of your RAID array failing during a rebuild is almost a certainty, because hard drives have become so large.
5575
Migrate Everything from Linux to BSD
As an operating system GNU/Linux has become a mess because of the fragmented nature of the project, the bloatware in the kernel, but mainly because of the manipulation by corporate interests. There exist several technical reasons for when a migration from GNU/Linux to BSD make sense, but this article isn't about that…
5576
Mtime comparison considered harmful
tl;dr: Rebuilding a target because its mtime is older than the mtimes of its dependencies, like `make` does, is very error prone. redo does...
5577
Revisiting 64-bit-ness in Visual Studio and elsewhere (2015)
Access to this page requires authorization. You can try signing in or changing directories .
5578
Effortless Performance Improvements in C++: std:unordered_map
This is the second post in the series about effortless performance improvements in C++. Check the first post to get the full story!
5579
Each socket should have two file descriptors
What if, instead of running a process-data program on this machine, we want to run it on another machine? No problem. We make a TCP connection to a process-data server on the remote machine. On the local machine, we have generate-data writing to the TCP connection, and consume-data reading from the TCP connection…
5580
