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a day ago
Daniel Lemire's blog
Converting data to hexadecimal outputs quickly

source
Daniel Lemire's blog
Converting data to hexadecimal outputs quickly
Converting data to hexadecimal outputs quickly
Given any string of bytes, you can convert it to an hexadecimal string by mapping the least significant and the most significant 4 bits of byte to characters in 01...9A...F. There are more efficient techniques like base64, that map 3 bytes to 4 characters.…
2 days ago
Daniel Lemire's blog
Converting floats to strings quickly

Telegraph | source
Telegraph
Converting floats to strings quickly
When serializing data to JSON, CSV or when logging, we convert numbers to strings. Floating-point numbers are stored in binary, but we need them as decimal strings. The first formally published algorithm is Steele and White’s Dragon schemes (specifically…
3 days ago
Easton Man's Channel
https://www.youtube.com/watch?v=kGof6AnzICs
30-40min后开始
3 days ago
https://www.youtube.com/watch?v=kGof6AnzICs
YouTube
4th Data Prefetching Championship (DPC4) - HPCA 2026 - Sydney - Feb 1, 2026
Proceedings of the 4th Data Prefetching Championship (DPC4)

Date and Time: Feb 1, 2026, 13:45 AEDT
Organizers: Rahul Bera, Konstantinos Kanellopoulos, Prof. Onur Mutlu
Main program: https://sites.google.com/view/dpc4-2026/program/main-program
Workshop website:…
02:48 · Jan 28, 2026 · Wed
Chips and Cheese
Arm’s Cortex A725 ft. Dell’s Pro Max with GB10
#ChipAndCheese

Telegraph | source
(author: Chester Lam)
Telegraph
Arm’s Cortex A725 ft. Dell’s Pro Max with GB10
Arm’s 7-series cores started out as the company’s highest performance offerings. After Arm introduced the performance oriented X-series, 7-series cores have increasingly moved into a density focused role. Like Intel’s E-Cores, Arm’s 7-series cores today derive…
ChipAndCheese
07:23 · Jan 26, 2026 · Mon
Daniel Lemire's blog
Optimizing Python scripts with AI

Telegraph | source
Telegraph
Optimizing Python scripts with AI
One of the first steps we take when we want to optimize software is to lookat profiling data. Software profilers are tools that try to identify whereyour software spends its time. Though the exact approach can vary, a typical profiler samples your software…
20:21 · Jan 24, 2026 · Sat
属于CYY自己的世界
ZRAM might be a budget solution for high-priced DRAM

Telegraph | source
(author: Yangyu Chen)
Telegraph
ZRAM might be a budget solution for high-priced DRAM
Background As DRAM prices continue to rise, many users are exploring alternative solutions to manage memory more efficiently. I rencently tried using ZRAM on my personal EPYC server with 256GB of RAM running 2 Vivado 2025.2 simultaneously to synthesize XiangShan…
20:06 · Jan 21, 2026 · Wed
杰哥的{运维，编程，调板子}小笔记
记一次软 RAID1 坏盘的恢复过程

Telegraph | source
Telegraph
记一次软 RAID1 坏盘的恢复过程
记一次软 RAID1 坏盘的恢复过程¶ 背景¶ 最近遇到一个运维场景，两个 SATA 盘组了一个 RAID1，Linux 的根系统也在上面，启动时能进内核，但是内核一直在报错 link is too slow to respond, please be patient 以及 COMRESET failed (errno=-16)。下面记录一下故障排查以及恢复的过程。 恢复过程¶ 考虑到 Linux 系统也在 RAID1 上面，所以找了另一台机器，接上两个 SATA 盘，然后观察到，其中一个盘直接无法识别…
20:06 · Jan 21, 2026 · Wed
杰哥的{运维，编程，调板子}小笔记
IBM POWER9 微架构评测

Telegraph | source
Telegraph
IBM POWER9 微架构评测
IBM POWER9 微架构评测¶ 背景¶ 继 IBM POWER8 之后，也来评测一下后续的 IBM POWER9 微架构。IBM POWER9 有 SMT4 和 SMT8 两种版本，我只有 SMT4 版本的测试环境，下列所有评测都是针对 SMT4 版本进行测试。 官方信息¶ IBM 关于 POWER9 微架构有如下公开信息： IBM POWER9 processor core IBM Power9 Processor Architecture 下面分各个模块分别记录官方提供的信息，以及实测的结果。官…
20:06 · Jan 21, 2026 · Wed
杰哥的{运维，编程，调板子}小笔记
IBM POWER8 微架构评测

Telegraph | source
Telegraph
IBM POWER8 微架构评测
IBM POWER8 微架构评测¶ 背景¶ 之前评测了很多 AMD64 和 ARM64 指令集的处理器，这次也来评测一下 PPC64LE 指令集的 IBM POWER8 微架构。 官方信息¶ IBM 关于 POWER8 微架构有如下公开信息： IBM POWER8 processor core microarchitecture 下面分各个模块分别记录官方提供的信息，以及实测的结果。官方信息与实测结果一致的数据会加粗。 Benchmark¶ IBM POWER8 的性能测试结果见 SPEC。 前端¶
07:46 · Jan 18, 2026 · Sun
Daniel Lemire's blog
A new way to call C from Java: how fast is it?

source
Daniel Lemire's blog
A new way to call C from Java: how fast is it?
A new way to call C from Java: how fast is it?
Irrespective of your programming language of choice, calling C functions is often a necessity. For the longest time, the only standard way to call C was the Java Native Interface (JNI). But it was so painful that few dared to do it. I have heard it said that…
02:03 · Jan 16, 2026 · Fri
dramforever's blog
Cryptography 30 years apart: Ascon on an HP-16C

Telegraph | source
Telegraph
Cryptography 30 years apart: Ascon on an HP-16C
Ascon (NIST, Wikipedia) is a set of lightweight cryptographic algorithms intended for resource constrained applications that nevertheless is intended to produce modern security. It was finalized as a standard in August of 2025 as NIST SP 800-232 “Ascon-Based…
22:57 · Jan 14, 2026 · Wed
Daniel Lemire's blog
How stagnant is CPU technology?

Sometimes, people tell me that there is no more progress in CPU performance.

Consider these three processors which had comparable prices at release time.

1. The AMD Ryzen 7 9800X3D (Zen 5, with up to 5.3 GHz boost) was released in 2024.
2. The AMD Ryzen 7 7800X3D (Zen 4, with up to 5.1 GHz boost) was released in 2023.
3. The AMD Ryzen 7 5800X3D (Zen 3, with 3.4 GHz base) was released in 2022.

Let us consider their results on on the PartialTweets open benchmark (JSON parsing). It is a single core benchmark.

In two years, on this benchmark, AMD more than doubled the performance for the same cost.

So what is happening is that processor performance is indeed going up, sometimes dramatically so, but not all of our software can benefit from the improvements. It is up to us to track the trends and adopt our software accordingly.

source
21:46 · Jan 9, 2026 · Fri
08:49 · Jan 8, 2026 · Thu
Daniel Lemire's blog
What I Got Wrong About “Hard Work” in My 20s

Telegraph | source
Telegraph
What I Got Wrong About “Hard Work” in My 20s
When I was younger, in my 20s, I assumed that everyone was working “hard,” meaning a solid 35 hours of work a week. Especially, say, university professors and professional engineers. I’d feel terribly guilty when I would be messing around, playing video games…
08:56 · Jan 7, 2026 · Wed
Daniel Lemire's blog
A bit of glass and freedom is all you need

Telegraph | source
Telegraph
A bit of glass and freedom is all you need
Generated by RSStT. The copyright belongs to the original author. Source
05:36 · Jan 7, 2026 · Wed
Chips and Cheese
CES 2026: Taking the Lids off AMD's Venice and MI400 SoCs
#ChipAndCheese

Telegraph | source
(author: George Cozma)
Telegraph
CES 2026: Taking the Lids off AMD's Venice and MI400 SoCs
Hello you fine Internet folks, Here at CES 2026, AMD showed off their upcoming Venice series of server CPUs and their upcoming MI400 series of datacenter accelerators. AMD has talked about the specifications of both Venice and the MI400 series at their Advancing…
ChipAndCheese
05:37 · Jan 5, 2026 · Mon
Chips and Cheese
Diving into Qualcomm's Upcoming Adreno X2 GPU with Eric Demers
#ChipAndCheese

Telegraph | source
(author: George Cozma)
Telegraph
Diving into Qualcomm's Upcoming Adreno X2 GPU with Eric Deme…
Hello you fine Internet folks, Today we are talking about Qualcomm's upcoming X2 GPU architecture with Eric Demers, Qualcomm's GPU Team lead. We talk about the changes from the prior X1 generation of GPUs along with why some of the changes were made. Hope…
ChipAndCheese
10:24 · Jan 4, 2026 · Sun
https://www.nite07.com/zh-cn/posts/git-includeif/
Nite
Git includeIf：优雅地管理多个 Git 身份
Git includeIf：优雅地管理多个 Git 身份
作为开发者，你是否遇到过这样的尴尬：在公司项目中不小心用个人邮箱提交了代码？或者在开源项目中暴露了工作邮箱？如果你同时维护着工作项目和个人项目，手动切换 Git 配置不仅繁琐，还容易出错。
幸运的是，Git 提供了一个强大而优雅的解决方案：includeIf。这个功能可以让 Git 根据不同的条件自动加载不同的配置文件，彻底解决多身份管理的难题。
为什么需要 includeIf？ 在日常开发中，我们常常需要在不同的身份之间切换：
Before
 
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