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LaurieWired

@lauriewired • 153,994 subscribers

researcher @google; serial complexity unpacker; https://t.co/Vl1seeNgYK ex @ msft & aerospace

Shorts

We take randomness for granted. Early PRNGs were BAD. Thousands of scientific papers used to rely on RANDU, created by IBM in the 1960s. In 1D space, it looks ok! Map in 3D…you start to see the issues. Now, there *was* a better solution...but it would cost you.

We take randomness for granted. Early PRNGs were BAD. Thousands of scientific papers used to rely on RANDU, created by IBM in the 1960s. In 1D space, it looks ok! Map in 3D…you start to see the issues. Now, there was a better solution...but it would cost you.

587,384 görüntüleme

Every year shopify makes a website tracking the massive surge in compute on black friday. Right now they are tracking ~45+ million Kafka requests per second, and about 88,000 gigabytes of data per minute. (it's also just a really cool website)

Every year shopify makes a website tracking the massive surge in compute on black friday. Right now they are tracking ~45+ million Kafka requests per second, and about 88,000 gigabytes of data per minute. (it's also just a really cool website)

237,579 görüntüleme

hey! this might help you, you don’t have to FTP elf files and manually load them like that, you can use PS2link and push elfs directly across the network. I even have it setup where I have a virtual memory card that triggers FMCB to auto-load PS2Link, so you can rapidly iterate on real hardware

hey! this might help you, you don’t have to FTP elf files and manually load them like that, you can use PS2link and push elfs directly across the network. I even have it setup where I have a virtual memory card that triggers FMCB to auto-load PS2Link, so you can rapidly iterate on real hardware

23,022 görüntüleme

I promise this relates to RAM (you'll find out in my next video)

I promise this relates to RAM (you'll find out in my next video)

75,566 görüntüleme

Modern tech tends to focus on “more”. More data. More bandwidth. More compute. The best software engineering happens in the “less” sphere; codec engineering. Listen to this stream with 90% packet loss. The Opus Encoder team is cracked:

Modern tech tends to focus on “more”. More data. More bandwidth. More compute. The best software engineering happens in the “less” sphere; codec engineering. Listen to this stream with 90% packet loss. The Opus Encoder team is cracked:

242,600 görüntüleme

Sharks love our undersea cables. Some suspect the weak, low-frequency fields attract sharks like distressed fish. Fiber optics are particularly tasty; AT&T expressed no incidents with “old [copper] cables”. In the 80s, telecoms called the incident Jaw's Syndrome.

Sharks love our undersea cables. Some suspect the weak, low-frequency fields attract sharks like distressed fish. Fiber optics are particularly tasty; AT&T expressed no incidents with “old [copper] cables”. In the 80s, telecoms called the incident Jaw's Syndrome.

203,188 görüntüleme

It's hot out there today guys. Don't forget to keep your servers cool with a nice hose-down.

It's hot out there today guys. Don't forget to keep your servers cool with a nice hose-down.

536,294 görüntüleme

Absurd as it sounds, with smaller experiments it was completely worth it to: - Buy the book - Open a random page - Mark your starting point with a pen - Hand Type / Punch the data into cards

Absurd as it sounds, with smaller experiments it was completely worth it to: - Buy the book - Open a random page - Mark your starting point with a pen - Hand Type / Punch the data into cards

61,581 görüntüleme

Is your compiler a boy or a MAN? Created by Donald Knuth, it’s a test to check if recursion is implemented properly. Originally written in ALGOL 60, a precursor to C, but can adapt to nearly any language. It really stresses the stack and heap, pushing insane call depths:

Is your compiler a boy or a MAN? Created by Donald Knuth, it’s a test to check if recursion is implemented properly. Originally written in ALGOL 60, a precursor to C, but can adapt to nearly any language. It really stresses the stack and heap, pushing insane call depths:

133,239 görüntüleme

it's not every day you get to touch a Cray-2 supercomputer

it's not every day you get to touch a Cray-2 supercomputer

64,993 görüntüleme

Of course, that fits nicely in 32-bit hardware. Only a few instructions. Apple put it in CarbonLib, FreeBSD also used it, and for a few decades it was kind of everywhere. A few years later they discovered that 48271 was a little better. Specifically, a bit more even on spectral tests up to 6 dimensions. It’s kind of funny that so few listened. FreeBSD was still using 16807 in rand() all the way until 2021! So if you ever see that constant in disassembled code…well now you know :) (side note: most rand() implementations moved on to other LCGs, or mersenne twisters and such…but it’s arguable that 16807 is still quite ubiquitous!) Original Paper if you’d like to read:

Of course, that fits nicely in 32-bit hardware. Only a few instructions. Apple put it in CarbonLib, FreeBSD also used it, and for a few decades it was kind of everywhere. A few years later they discovered that 48271 was a little better. Specifically, a bit more even on spectral tests up to 6 dimensions. It’s kind of funny that so few listened. FreeBSD was still using 16807 in rand() all the way until 2021! So if you ever see that constant in disassembled code…well now you know :) (side note: most rand() implementations moved on to other LCGs, or mersenne twisters and such…but it’s arguable that 16807 is still quite ubiquitous!) Original Paper if you’d like to read:

21,874 görüntüleme

Wanna know something wild? You can still reproduce a (similar) issue on modern systems. - Open a large file on notepad (not fullscreen) - Select text while scrolling down - Wiggle the mouse and notice the speed difference

Wanna know something wild? You can still reproduce a (similar) issue on modern systems. - Open a large file on notepad (not fullscreen) - Select text while scrolling down - Wiggle the mouse and notice the speed difference

79,564 görüntüleme

This pokemon clone is stored inside a font. Yes, an *actual* font; think Times New Roman. As expected, it's playable anywhere you use fonts. A text document, code editor, etc. The full game takes about ~20 minutes to play, an hour if you find all the secrets. But how?

This pokemon clone is stored inside a font. Yes, an actual font; think Times New Roman. As expected, it's playable anywhere you use fonts. A text document, code editor, etc. The full game takes about ~20 minutes to play, an hour if you find all the secrets. But how?

46,087 görüntüleme

Videos

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Modern DRAM is based on a brilliant design from IBM. But, we're still paying for a latency penalty that's existed since the 60s! In this video, I'm introducing my research project (Tailslayer) that immensely reduces p99.99 latency on traditional RAM! By implementing a hedged read strategy taking advantage of (undocumented!) channel scrambling offsets, I've gotten as much as 15x reductions in tail latency. The technique works across Intel, AMD, Graviton, DDR4, DDR5, x86, ARM, you name it. Check out the C++ lib I wrote, watch the video, and try it yourself!

Modern DRAM is based on a brilliant design from IBM. But, we're still paying for a latency penalty that's existed since the 60s! In this video, I'm introducing my research project (Tailslayer) that immensely reduces p99.99 latency on traditional RAM! By implementing a hedged read strategy taking advantage of (undocumented!) channel scrambling offsets, I've gotten as much as 15x reductions in tail latency. The technique works across Intel, AMD, Graviton, DDR4, DDR5, x86, ARM, you name it. Check out the C++ lib I wrote, watch the video, and try it yourself!

860,059 görüntüleme • 1 ay önce

someone built a Linux CPU scheduler that makes scheduling decisions based on planetary positions and zodiac signs it actually works haha:

someone built a Linux CPU scheduler that makes scheduling decisions based on planetary positions and zodiac signs it actually works haha:

1,655,296 görüntüleme • 4 ay önce

I love C++. It's the ultimate computer virus. Sometimes, Worse Is Better, New Jersey beats out MIT, and the dirt path always wins. The ghosts of these decisions still affect every operating system we use today! 00:00 The Dirt Path 01:00 A Third-Rate Computer Scientist 03:17 MIT vs New Jersey 05:49 The 100% Correctness Deathtrap 08:24 C++, the Ultimate Virus

I love C++. It's the ultimate computer virus. Sometimes, Worse Is Better, New Jersey beats out MIT, and the dirt path always wins. The ghosts of these decisions still affect every operating system we use today! 00:00 The Dirt Path 01:00 A Third-Rate Computer Scientist 03:17 MIT vs New Jersey 05:49 The 100% Correctness Deathtrap 08:24 C++, the Ultimate Virus

91,904 görüntüleme • 8 gün önce

Programming Isn't Math, It's Linguistics. Compilers and Humans have the same problem. We're all terrible at understanding each other. Join me for some formal language theory, a lot of C++, and some "recreational" insults.

Programming Isn't Math, It's Linguistics. Compilers and Humans have the same problem. We're all terrible at understanding each other. Join me for some formal language theory, a lot of C++, and some "recreational" insults.

981,446 görüntüleme • 7 ay önce

You play doom with a CPU. I play doom with CPU usage. we are not the same

You play doom with a CPU. I play doom with CPU usage. we are not the same

3,619,811 görüntüleme • 2 yıl önce

This...is Programming Like a Fighter Pilot. A single unhandled exception destroyed a $500 million rocket in seconds. The F-35 wasn't going to make the same mistake. By carefully slicing C++, engineers created one of the strictest coding standards ever written.

This...is Programming Like a Fighter Pilot. A single unhandled exception destroyed a $500 million rocket in seconds. The F-35 wasn't going to make the same mistake. By carefully slicing C++, engineers created one of the strictest coding standards ever written.

376,895 görüntüleme • 6 ay önce

Gen Z doesn't Understand Filesystems. It's not their fault. Apple's early abstraction of mobile data storage has caused...confusion to say the least. But what does the *real* iOS filesystem look like? As a researcher myself; it's kind of insanely complicated:

Gen Z doesn't Understand Filesystems. It's not their fault. Apple's early abstraction of mobile data storage has caused...confusion to say the least. But what does the real iOS filesystem look like? As a researcher myself; it's kind of insanely complicated:

490,146 görüntüleme • 9 ay önce

Telephone Hold music sounds really bad. Mostly because it’s mapping complex instruments to a human throat. Many phone lines these days use CELP, Code-Excited Linear Prediction algorithms. Music breaks down in weird ways when you turn a piano into…speech.

Telephone Hold music sounds really bad. Mostly because it’s mapping complex instruments to a human throat. Many phone lines these days use CELP, Code-Excited Linear Prediction algorithms. Music breaks down in weird ways when you turn a piano into…speech.

133,230 görüntüleme • 2 ay önce

Fading out audio is one of the most CPU-intensive tasks you can possibly do! When numbers get really small, the number of CPU operations can explode 100-fold. In this LaurieWired video, we'll explore the IEEE 754 standard, the fight between Intel and DEC, and more!

Fading out audio is one of the most CPU-intensive tasks you can possibly do! When numbers get really small, the number of CPU operations can explode 100-fold. In this LaurieWired video, we'll explore the IEEE 754 standard, the fight between Intel and DEC, and more!

403,177 görüntüleme • 9 ay önce

my 2025 predictions in computer science

my 2025 predictions in computer science

628,359 görüntüleme • 1 yıl önce

ignore the rumors, computer science is still cool here's my predictions for 2026

ignore the rumors, computer science is still cool here's my predictions for 2026

132,619 görüntüleme • 3 ay önce

Open Source isn't going to help. There's a way to invisibly compromise all software. A perfect, self-replicating "sin" passed down for generations of compilers. It's not just theoretical, and Ken Thompson showed us how.

Open Source isn't going to help. There's a way to invisibly compromise all software. A perfect, self-replicating "sin" passed down for generations of compilers. It's not just theoretical, and Ken Thompson showed us how.

264,543 görüntüleme • 7 ay önce

Merry Christmas everyone!

Merry Christmas everyone!

158,472 görüntüleme • 5 ay önce

One of the best glimpses of chip fabrication comes from a music video. Such Great Heights from The Postal Service has some incredibly rare footage of wafer handling in Skywork’s RF power-amplifier fab. Filming inside (real) cleanrooms almost never happens.

One of the best glimpses of chip fabrication comes from a music video. Such Great Heights from The Postal Service has some incredibly rare footage of wafer handling in Skywork’s RF power-amplifier fab. Filming inside (real) cleanrooms almost never happens.

160,658 görüntüleme • 5 ay önce

can you guess which one is me? (hint I'm always the shortest)

can you guess which one is me? (hint I'm always the shortest)

110,452 görüntüleme • 3 ay önce

$What happens if we can't make another CPU...ever? How long would datacenters last? Does the Internet start to fracture? Of course, it's a hypothetical thought experiment. But it's interesting to think about:$

What happens if we can't make another CPU...ever? How long would datacenters last? Does the Internet start to fracture? Of course, it's a hypothetical thought experiment. But it's interesting to think about:

200,606 görüntüleme • 8 ay önce

Just built an MCP for Ghidra. Now basically any LLM (Claude, Gemini, local...) can Reverse Engineer malware for you. With the right prompting, it automates a *ton* of tedious tasks. One-shot markups of entire binaries with just a click. Open source, on Github now.

Just built an MCP for Ghidra. Now basically any LLM (Claude, Gemini, local...) can Reverse Engineer malware for you. With the right prompting, it automates a ton of tedious tasks. One-shot markups of entire binaries with just a click. Open source, on Github now.

284,079 görüntüleme • 1 yıl önce

This music video can crash your computer. It even has its own CVE number (CVE-2022-38392). Janet Jackson’s “Rhythm Nation” contains specific resonant frequencies that cause errors on certain 5400rpm hard drives. Play at your own risk.

This music video can crash your computer. It even has its own CVE number (CVE-2022-38392). Janet Jackson’s “Rhythm Nation” contains specific resonant frequencies that cause errors on certain 5400rpm hard drives. Play at your own risk.

215,997 görüntüleme • 10 ay önce

pretty proud of how my DIY F16 MFD came out using it to demonstrate some C++ aircraft coding standards for my next video!

pretty proud of how my DIY F16 MFD came out using it to demonstrate some C++ aircraft coding standards for my next video!

126,428 görüntüleme • 6 ay önce

Dave Jones easy, mr. linux himself uses fedora

Dave Jones easy, mr. linux himself uses fedora

92,020 görüntüleme • 4 ay önce