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An Update on Our Outage
Roblox is a global platform where millions of people gather together every day to imagine, create, and share experiences with each other in immersive, user-generated 3D worlds.
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AWS Lambda Cold Start Times
Let’s compare the performance of all supported runtimes + 2 custom runtimes (Rust and GraalVM).
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Weird architectures weren't supported to begin with
This post contains my own opinions, not the opinions of my employer or any open source groups I belong or contribute to.
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The Perils of M1 Ownership
The primary admin account on an M1 Mac is its Owner, responsible for authorising the installation and use of second operating systems. Here’s what can go wrong with Ownership.
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The compiler will optimize that away
A lot of programmers believe that compilers are magic black boxes in which you put your messy code in and get a nice optimized binary out. The hallway philosophers will often start a debate on which language features or compiler flags to use in order to capture the full power of the compiler’s magic. If you have ever…
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M1 Macs have another hidden boot mode
Apple has revealed the hidden Fallback Recovery OS mode available on M1 Macs. How to enter and use it, and why it’s another big plus.
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The Raspberry Pi can boot off NVMe SSDs now
When the Compute Module 4 was released (see my CM4 review here), I asked the Pi Foundation engineers when we might be able to boot off NVMe storage, since it was trivially easy to use with the exposed PCIe x1 lane on the CM4 IO Board. The initial response in October 2020 was "we'll see". Luckily, after more people…
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Authenticated Boot and Disk Encryption on Linux
Posts and writings by Lennart Poettering
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How much faster is Java 17?
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Why does the New menu even exist for creating new empty files?
You have to open the file anyway to make it useful, so why not just open the program directly?
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Malloc broke Serenity's JPGLoader, or: how to win the lottery
I got the chance to investigate an interesting bug in SerenityOS this week. It was related to the decoding of JPG images in the operating system. For some reason, when a JPG image is viewed, it comes out like this: Lenna, showing up with incorrect colors. Weird, huh? Also seems like a simple confusion of RGB vs. BGR…
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.NET 6 vs .NET 5 speedup
A year ago I wrote a post comparing .NET 5 performance with its predecessor on Fusion performance tests, and honestly, I was quite…
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There is no 'printf'
In C, 'main' returns an int. What happens when you don't explicitly return a value, though? C99 provides a return value of 0, but C89... well, that's undefined, my favorite kind of behavior.
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Branch predictor: How many “if”s are too many?
Is it ok to have if clauses that will basically never be run? Surely, there must be some performance cost to that...
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Escaping VirtualBox 6.1: Part 1
This post is about a VirtualBox escape for the latest currently available version (VirtualBox 6.1.16 on Windows). The vulnerabilities were discovered and exploited by our team Sauercl0ud as part of the RealWorld CTF 2020/2021. The vulnerability was known to the organizers, requires the guest to be able to insert…
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QEMU Internals
A series of posts about QEMU internals:
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Modules, Monoliths, and Microservices
Learn what are microservices, when are microservices beneficial and how module boundaries impact software design.
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Software Infrastructure 2.0: A Wishlist
Erik Bernhardsson
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GC progress from JDK 8 to JDK 17
JDK 17 has been out for a few months and it’s not just packed with new language features. The performance boost compared to older JDK versions is also really significant. It becomes especially clear when compared to the previous LTS releases, JDK 8 and JDK 11. Much of the improved performance comes from new features…
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Software Architecture Patterns: 5 minute read
Main software architecture patterns in a nutshell.
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Improving large monorepo performance on GitHub
GitHub has done a lot of work in the last six months to improve performance for large monorepos.
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The Apple M1 compiles Linux 30% faster than my Intel i9
(With a caveat: I'm compiling the ARMv8 64-bit Pi OS kernel.) It seems every week or so on Hacker News, a story hits the front page showing some new benchmark and how one of the new M1-based Macs matches or beats the higher-priced competition in some specific benchmark—be it GeekBench, X86-specific code, or building…