On the Costs of Syscalls (2021) https://gms.tf/on-the-costs-of-syscalls.html

Georg's Log

On the Costs of Syscalls

It's well known that syscalls are expensive. And that software mitigations against CPU bugs (such as Meltdown) even have made them more expensive. But how expensive are they really? To begin to answer this question I wrote a small micro-benchmark in order…

ScatterAlloc: Massively Parallel Dynamic Memory Allocation for the GPU

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via calvin@users.lobste.rs (calvin)

隔壁群友 @chenyy 发现了 Linux 中 mmap 在 RISC-V 指令集和其他指令集行为不一致的情况，提出了一个 patch。但是维护者十分消极对待这个 patch，且之前引入问题的、质量堪忧的 patch 也是在 review 欠缺的情况下被草率地合并的。
他认为这个问题如果不解决，对之后的 RISC-V 生态是十分灾难的，例如会影响一些内存需求较大的软件在 RISC-V 平台上的使用。因为他的频道是私有频道，有关此问题的更多详细内容请见下面的 telegraph：
https://telegra.ph/Linux-%E4%B8%AD-RISC-V-%E7%9A%84-mmap-%E7%9A%84%E9%87%8D%E5%A4%A7%E9%97%AE%E9%A2%98-01-29
因为他俩吵架已经吵不动了，现在他希望有更多相关的开发者能够参与讨论，无论是支持目前的情况还是支持他的想法，都能去邮件列表发表一下自己的见解。

Two handy GDB breakpoint tricks https://nullprogram.com/blog/2024/01/28/

最近在给 clangir 弄 dynamic_cast 支持，发现 clang 17 能够优化 dynamic_cast 到 final class 的情况了

Process spawning performance in Rust

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via mgdm@users.lobste.rs (mgdm)

Kobzol’s blog

Process spawning performance in Rust

As part of my PhD studies, I’m working on a distributed task runtime called HyperQueue. Its goal is to provide an ergonomic and efficient way to execute task graphs on High-Performance Computing (HPC) distributed clusters, and one of its duties is to be able…

GitHub Spam https://djanes.xyz/spam-on-github-is-getting-crazy-these-days/

Dan Janes

GitHub Spam is out of control - Dan Janes

Spam on GitHub is getting out of control and affecting 10,000's of users daily. GitHub is seemly doing nothing about it, here is the proof.

今日晚餐

WASI Preview 2 Launched

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via tomhoule@users.lobste.rs (tomhoule)

sunfishcode's blog

WASI Preview 2 Launched

A blog by sunfishcode

Frame pointers vs DWARF – my verdict

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via itamarst@users.lobste.rs (itamarst)

Richard WM Jones

Frame pointers vs DWARF – my verdict

A couple of weeks ago I wrote a blog posting here about Fedora having frame pointers (LWN backgrounder, HN thread). I made some mistakes in that blog posting and retracted it, but I wasn’t wr…

Rust 虚表布局规则介绍

在 Rust 中，一个指向未知大小对象（!Sized）的引用或指针被实现为一个由两个 usize 大小的域构成… 阅读更多 »Rust 虚表布局规则介绍

via Lancern's Blog

当地时间25日下午1点40分，京都地方法院一审判决京都动画纵火案被告青叶真司死刑。其被指控五年前纵火焚烧京都动画工作室，导致 36 名员工死亡。

Rust可能要有refinement type了

https://github.com/rust-lang/keyword-generics-initiative/blob/backwards-compatible-pattern-types/evaluation/pattern-types.md

An introduction to temporal logic and how it can be used to analyze concurrency https://github.com/Dicklesworthstone/introduction_to_temporal_logic

GitHub

GitHub - Dicklesworthstone/introduction_to_temporal_logic: An introduction to temporal logic and how it can be used to analyze…

An introduction to temporal logic and how it can be used to analyze concurrency - Dicklesworthstone/introduction_to_temporal_logic

Making Rust binaries smaller by default

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via itamarst@users.lobste.rs (itamarst)

Kobzol’s blog

Making Rust binaries smaller by default

Have you ever tried to compile a helloworld Rust program in --release mode? If yes, have you seen its binary size? Suffice to say, it’s not exactly small. Or at least it wasn’t small until recently. This post details how I found about the issue and my attempt…

瑞幸app的ux真的垃圾

进入菜单后app会尝试获取定位信号并自动选中附近最近的门店。但如果用户在app成功获取定位信号之前手动选择了门店，那么在获取定位信号成功后app自动选中的门店依然会不加通知地覆盖用户手工选中的门店。如果用户后续在下单时没有仔细检查订单就会下到错误的门店。

已经因为这个问题下错了好几次单了。

An RNG that runs in your brain

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via hwayne@users.lobste.rs (hwayne)

Hillel Wayne

An RNG that runs in your brain

Humans are notoriously bad at coming up with random numbers. I wanted to be able to quickly generate “random enough” numbers. I’m not looking for anything that great, I just want to be able to come up with the random digits in half a minute. Some looking…