杰哥的{运维，编程，调板子}小笔记
AMD Zen 1 的 BTB 结构分析

Telegraph | source

Telegraph

AMD Zen 1 的 BTB 结构分析

AMD Zen 1 的 BTB 结构分析¶ 背景¶ AMD Zen 1 是 AMD 的 Zen 系列的第一代微架构。在之前，我们分析了 ARM Neoverse N1 和 V1 的 BTB，那么现在也把视线转到 AMD 上，看看 AMD 的 Zen 系列的 BTB 是如何演进的。 官方信息¶ AMD 在 Software Optimization Guide for AMD Family 17h Processors 中有如下的表述： The branch target buffer (BTB) is a…

Chips and Cheese
Intel’s Lion Cove P-Core and Gaming Workloads
#ChipAndCheese

Telegraph | source
(author: Chester Lam)

Telegraph

Intel’s Lion Cove P-Core and Gaming Workloads

Lion Cove is Intel’s latest high performance CPU architecture. Compared to its predecessor, Raptor Cove, Intel’s newest core can sustain more instructions per cycle, reorganizes the execution engine, and adds an extra level to the data cache hierarchy. The…

Daniel Lemire's blog
Just say no to broken JSON

Telegraph | source

Telegraph

Just say no to broken JSON

JSON, or JavaScript Object Notation, is a lightweight data-interchange format. It is widely used for transmitting data between a server and a web application, due to its simplicity and compatibility with many programming languages. The JSON format has a simple…

Daniel Lemire's blog
Base64 for compression

Telegraph | source

Telegraph

Base64 for compression

C and C++ compilers like GCC first take your code and produce assembly, typically a pure ASCII output (so just basic English characters). This assembly code is a low-level representation of the program, using mnemonic instructions specific to the target processor…

好的，不带来源

投稿测试

[bilibili 动态]

属于CYY自己的世界
非原生 eSIM 手机出国旅游 eSIM 使用指北

Telegraph | source
(author: Yangyu Chen)

Telegraph

非原生 eSIM 手机出国旅游 eSIM 使用指北

背景 最近两个月去了法国和日本开会，发现 eSIM 在旅游时使用非常方便，我们可以直接在网上购买旅行 SIM 卡套餐然后扫码下载，主要好处包括： 套餐自由选择，可以按照自己最低需求购买低价套餐，不必担心部分 SIM 卡无法流量充值的问题 低可用性风险，遇到问题随时可以下载新的 SIM 卡使用，不必等待快递 灵活切换运营商，遇到某个运营商信号不好，此时有其他运营商 eSIM 时，可以在手机上点击菜单直接完成切换，而无需带着取卡针更换实体 SIM 卡 （比如我们去 Waseda 开会发现 docomo 和 SoftBank…

Chips and Cheese
Blackwell: Nvidia’s Massive GPU
#ChipAndCheese

Telegraph | source
(author: Chester Lam)

Telegraph

Blackwell: Nvidia’s Massive GPU

Nvidia has a long tradition of building giant GPUs. Blackwell, their latest graphics architecture, continues that tradition. GB202 is the largest Blackwell die. It occupies a massive 750mm2 of area, and has 92.2 billion transistors. GB202 has 192 Streaming…

Daniel Lemire's blog
From code reuse to the impact of generative AI

Telegraph | source

Telegraph

From code reuse to the impact of generative AI

Back when I started programming, project teams were large. Organizations had dozens of programmers on sprawling projects. Reusing code was not trivial. Sharing code required real effort. Sometimes you had to hand over a disk or recopy code from a printout.…

马上要填志愿了，欢迎各位积极转发 https://colleges.chat ，以及去 https://www.wenjuan.com/s/UZBZJv8lWrd/ 更新一些最新数据。

colleges.chat

大学生活质量指北

收集全世界各高校招生时不会写明但实实在在影响大学生活质量的详尽信息

HND-PEK

TIL: 查看包含某个 commit 的最近 tag

可以用来判断某个 commit 被包含在哪个版本里

git describe --contains <commit-hash>

杰哥的{运维，编程，调板子}小笔记
ARM Neoverse V1 (代号 Zeus) 的 BTB 结构分析

Telegraph | source

Telegraph

ARM Neoverse V1 (代号 Zeus) 的 BTB 结构分析

ARM Neoverse V1 (代号 Zeus) 的 BTB 结构分析¶ 背景¶ ARM Neoverse V1 是 ARM Neoverse N1 的下一代服务器 CPU，之前我们分析过 Neoverse N1 的 BTB 设计。而 ARM Neoverse V1 在很多地方都和 Cortex-X1 类似，有了一些改进，在这里对它的 BTB 做一些分析。 官方信息¶ 首先收集了一些 ARM Neoverse V1 的 BTB 结构的官方信息： SW defined cars: HPC, from the…

Daniel Lemire's blog
Discover C++26’s compile-time reflection

Telegraph | source

Telegraph

Discover C++26’s compile-time reflection

Herb Sutter just announced that the verdict is in: C++26, the next version of C++, will include compile-time reflection. Reflection in programming languages means that you have access the code’s own structure. For example, you can take a class, and enumerate…

Arch Linux: Recent news updates
linux-firmware >= 20250613.12fe085f-5 upgrade requires manual intervention

With 20250613.12fe085f-5, we split our firmware into several vendor-focused packages. linux-firmware is now an empty package depending on our default set of firmware.

Unfortunately, this coincided with upstream reorganizing the symlink layout of the NVIDIA firmware, resulting in a situation that Pacman cannot handle. When attempting to upgrade from 20250508.788aadc8-2 or earlier, you will see the following errors:

linux-firmware-nvidia: /usr/lib/firmware/nvidia/ad103 exists in filesystem
linux-firmware-nvidia: /usr/lib/firmware/nvidia/ad104 exists in filesystem
linux-firmware-nvidia: /usr/lib/firmware/nvidia/ad106 exists in filesystem
linux-firmware-nvidia: /usr/lib/firmware/nvidia/ad107 exists in filesystem

To progress with the system upgrade, first remove linux-firmware, then reinstall it as part of the upgrade:

# pacman -Rdd linux-firmware
# pacman -Syu linux-firmware

source
(author: Jan Alexander Steffens)

Daniel Lemire's blog
Life expectancy of men in Canadian provinces

Telegraph | source

Telegraph

Life expectancy of men in Canadian provinces

n North America, my home province of Quebec has a slightly higher life expectancy than the rest of the country. It is also a poorer-than-average province, so that is maybe surprising. For 2023, the life expectancy at birth in Ontario was 82.33 years, whereas…