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Do-It-Yourself OpenJDK Garbage Collector
Aleksey Shipilёv, JVM/Performance Geek, Shout out at Twitter: @shipilev Questions, comments, suggestions: aleksey@shipilev.net
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 4,389 posts.
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XTerm: It's Better Than You Thought
A couple months back I switched my terminal from xfce4-terminal to the venerable xterm. For some reason I always put xterm in the same bucket as xclock, xmessage, or any other prehistoric command starting with X that comes pre-installed on any graphical Linux distribution.
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Initial Impressions of WSL 2
Soon the Windows May 2020 Update (20H1) will be released upon the world. This update will contain some nice UI improvements, but most relevant to me it allows Web Developers on Windows to upgrade to WSL 2. This is a significant milestone in the #davegoeswindows saga and it’s worth posting about what it means going…
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The Cost of JavaScript Frameworks
Tim Kadlec writes about performance, product management, and the web.
2585
Linux is Making Apple Great Again
My personal website and blog
2586
Why does musl make my Rust code so slow?
Software engineer specializing in query engines and distributed systems
2587
What are the differences between OpenBSD and Linux?
Maybe you have been reading recently about the release of OpenBSD 6.5 and wonder, 'What are the differences between Linux and OpenBSD?' I've also been there at some point in the past and these are my conclusions. They also apply, to some extent,
2588
It's TCP vs. RPC All over Again
We’ve written previously about the fact that the Internet seems to be missing a standard protocol for the request/response paradigm, with repeated attempts to force-fit TCP leading to inevitable mismatches. Sometimes we feel that we are the only people who think this way, with our networking
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Tar Files Created on macOS Display Errors When Extracting on Linux (2024)
tar.gz files seem to include extra files starting with ._. When these are extracted on Linux, a bunch of errors are displayed.
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Billion file filesystem
For a lark I made an ext4 file system with a billion empty files. https://gitlab.com/larswirzenius/create-empty-files has the program I wrote for this. I've done this before , but this time I made it a little simpler for me to do it again: everything in one Rust program rather than clunky scripts.
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A deep dive into Rust and C memory interoperability
An in-depth exploration of what happens when Rust and C memory allocators collide, featuring crash analysis.
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What is a 'unikernel'?
Learn what unikernels are, how they remove OS bloat between hardware and applications, and why they're gaining traction in cloud and microservices.
2596
O(N^2) in CreateProcess
So many possible introductions to this one: Windows 7: Sheesh, I sure am slow at creating processes Windows 10: Hold my beer… Or how about: A) How long does CreateProcess take on Windows? B) How lo…
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SIMD accelerated sorting in Java – how it works and why it was 3x faster
In this post I explain a little about how to use Java’s Vector APIs, attempt to explain how they turn out fast, and then use them to implement a sorting algorithm 3x faster than Arrays.sort . I then explain some problems I found, and how I resolved them. Supporting code is published here .
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When root meets immutable: OpenBSD chflags vs. log tampering
Rafael Sadowski
2600
Reflections on Software Performance
At this point in my career, I’ve worked on at least three projects where performance was a defining characteristic: Livegrep, Taktician, and Sorbet (I discussed sorbet in particular last time, and livegrep in an earlier post). I’ve also done a lot of other performance work on the tools I use, some of which ended up on…
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More on Postgres Performance
If you missed my previous post on Understanding Postgres Performance its a great starting point. On this particular post I’m going to dig in to some real life examples of optimizing queries and indexes. It all starts with stats I wrote about some of the great new features in Postgres 9.2 in the recent announcement on…
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What is Windows doing while hogging that lock?
Earlier this month I wrote about how Windows 10 holds a lock during too much of process destruction, which both serializes this task and causes mouse-cursor hitches and UI hangs (because the same l…
2603
Counting bytes faster than you'd think possible
“Summing ASCII Encoded Integers on Haswell at the Speed of memcpy” turned out more popular than I expected, which inspired me to take on another challenge on HighLoad: Counting uint8s . I’m currently only #13 on the leaderboard, ~7% behind #1, but I have already learned some interesting things. In this post I’ll…
2604
Good Code Design from Linux
Learn how Linux/FFmpeg C partial codebase is organized to be extensible and act as if it were meant to have “polymorphism”. Specifically, we’re going to briefly explore how Linux …
2605
Event-Driven Architecture
Using events to design applications is a practice that seems to be around since the late 1980s. We can use events anywhere in the frontend or backend. When a button is pressed, when some data chang…
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Notes on Paxos
These are my notes after learning the Paxos algorithm. The primary goal here is to sharpen my own understanding of the algorithm, but maybe someone will find this explanation of Paxos useful! This post assumes fluency with mathematical notation.
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Fedora/RISC-V reaches initial goal
Ha ha only joking. However when we started out on building Fedora on the free RISC-V architecture, the goal we decided on was to get every package in the Fedora @Core group built. I’m happy t…
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Why you might want async in your project
There is a common sentiment I’ve seen over and over in the Rust community that I think is ignorant at best and harmful at worst.
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Fundamental flaws of SIMD ISAs (2021)
According to Flynn’s taxonomy SIMD refers to a computer architecture that can process multiple data streams with a single instruction (i.e. “Single Instruction stream, Multiple Data streams”). There are different taxonomies, and within those several different sub-categories and architectures that classify as “SIMD”.