grahamking (@grahamking) profile picture

grahamking

@grahamking

Complexity conqueror; computer programmer. Rust, Linux. @grahamking@mastodon.social

 Portland, OR
darkcoding.net
Joined January 2008
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  • Following144
  • Followers243
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Photo by grahamking (@grahamking)Photo by grahamking (@grahamking)Photo by grahamking (@grahamking)Photo by grahamking (@grahamking)Photo by grahamking (@grahamking)Photo by grahamking (@grahamking)Photo by grahamking (@grahamking)
I took ChatGPT on holiday and it was like having a magic translator and tour guide in my pocket. From translating menus to explaining art and wine, it made everything easier and more interesting. New blog post: darkcoding.net/society/trave… #TravelWithAI #ChatGPT #TechMagic

Travels with ChatGPT

An overconfident genius personal assistant in my pocket

darkcoding.net
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In Rust what does this really do? > vec![0u8, 1024] New blog post featuring memset's optimized assembly, mmap's zero-page shortcut, and why 0's are better than 1's. darkcoding.net/software/rust… #rust #malloc #assembly #linux

Underrust: What does vec![0u8; 1024] really do?

How does Rust allocate a zeroed Vec and what does it cost?

darkcoding.net
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First blog post in over a year: Permanent memory with systemd's FDStore. darkcoding.net/software/rust…

The memory remains: Permanent memory with systemd and a Rust allocator

A Rust object that survives program restart thanks to Rust allocators, systemd's file descriptor store, and syscall memfd_create.

darkcoding.net
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not moving at all.
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Twitter, but you have to solve a leetcode puzzle every time you want to post something.
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COVID broke out eight miles from the world’s leading laboratory for the study of novel sarbecoviruses. That alone should thwack the burden of proof over the philosophical net. But that’s only the start of the coincidences and anomalies. bigthink.com/health/covid-or…
COVID origin case reopened: A lab leak is a legitimate question

COVID origin case reopened: A lab leak is a legitimate question

Three years after the pandemic began, we still don't know the origin of COVID. A strange lack of curiosity has stifled the debate.

bigthink.com
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grahamking retweeted
Holtz (@Biorealism) profile picture
Holtz
@Biorealism25 Oct 2022
Legendary computational biologist Nick Patterson: "My readers will know that I believe that it is overwhelmngly likely that COVID-19 was a virus engineered in the Wuhan Institute of Virology (WIV), that escaped by accident."
Image from Holtz (@Biorealism)
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What can you `epoll` on Linux? A comprehensive list. Please let me know if I missed any. darkcoding.net/software/linu… #linux #epoll #software

Linux: What can you epoll?

On Linux what can you turn into a file descriptor and then monitor with epoll?

darkcoding.net
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Ever wanted to write a Huge Pages memory allocator for Rust, and learn about the importance of TLB misses? Now you can! New lab on perf-ninja: github.com/grahamking/perf-n… #rust #performance
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John Carmack, Moxie Marlinspike, and Elon Musk geeking about leaf blowers. It's a beautiful world.
Image from grahamking (@grahamking)
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What if you spent a weekend overthinking the Two Sum interview question? For what values of N would your AVX-512 solution beat the map one? #rust #simd #performance #interview darkcoding.net/software/two-…

Overthinking Leetcode's Two Sum with SIMD

When is the linear scan Two Sum solution faster than a map? What if we use AVX-512 instructions?

darkcoding.net
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grahamking retweeted
Jon Gjengset (@jonhoo) profile picture
Jon Gjengset@jonhoo9 Oct 2022
PSA: Before copy-pasting a GitHub source code link, especially one that links to a line or line range, hit `y` to make the URL include the current commit hash. That way the link will keep working even if the file is later changed or moved/deleted. – at Los Angeles, CA
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What is the cost Rust's `sync::Once` after the initial call? Getting carried away with micro-performance analysis. darkcoding.net/software/cost… #rust #performance #assembly

Underrust: What is the cost of sync::Once?

In Rust, what is the performance cost of using sync::Once after the initial setup?

darkcoding.net
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On the Ethereum Virtual Machine if you try to execute an invalid instruction it aborts your program and takes all your money ("all remaining gas is consumed"). Hardcore. github.com/wolflo/evm-opcode…
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Writing a new series on Rust's assembly output: - Intro: darkcoding.net/software/unde… - First post: Does it matter what type (u8, u32, etc) I use?: darkcoding.net/software/does… #rust #assembly

The Underrust: Rust's assembly output

Assembly: In all the world of the programmer, there is no more important output.

darkcoding.net
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For the record, we don't WANT to name our servers `sjc2a-rs24-18b`. We would like to name them Italian wines or Lord of the Rings characters, but your insatiable compute demands leave us no choice. #SysadminsUnited #petsvscattle #sre
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This is a great course (and book) to improve your low-level performance tuning skills: github.com/dendibakh/perf-ni… If you want to do it in Rust (not C++), I ported all the labs for you: github.com/grahamking/perf-n… #performance #rust #DropboxHackWeek2022
GitHub - dendibakh/perf-ninja: This is an online course where you can learn and master the skill of...

GitHub - dendibakh/perf-ninja: This is an online course where you can learn and master the skill of...

This is an online course where you can learn and master the skill of low-level performance analysis and tuning. - dendibakh/perf-ninja

github.com
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A very small Rust binary indeed: darkcoding.net/software/a-ve… In which I shrink a Rust binary from 3.6MB to 400 bytes. #rust #linux #software

A very small Rust binary indeed

Can we make a Rust program that's as small as it's assembler equivalent?

darkcoding.net
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Bash script to setup machine to run benchmarks. Based on LLVM Benchmarking Tips: gist.github.com/grahamking/9… #performance #benchmarks #rust #bash
Bash script to run a benchmark under decent conditons.

Bash script to run a benchmark under decent conditons.

Bash script to run a benchmark under decent conditons. - runperf

gist.github.com
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Short blog post about using stack address as a random number thanks to ASLR: darkcoding.net/software/a-ra… #linux #rust #python #software

A random number you already have: The stack address

Thanks to Address Space Layout Randomization you can use the address of a stack variable as a zero-cost random number.

darkcoding.net
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