#TIL
如何去除 PDF 的 metadata

exiftool -all= some.pdf
qpdf --linearize some.pdf - > some.cleaned.pdf

#Music
人生难得是欢聚，唯有别离多
https://www.youtube.com/watch?v=Wf9nGbzkKLk

YouTube

城南送別（作詞／李叔同、林海音、作曲／周鑫泉、John Pond Ordway、合唱編曲／周鑫泉）－指揮：陳雲紅、鋼琴：王乃加、演出：台北室內合唱團

作詞/李叔同、林海音
作曲/周鑫泉、John Pond Ordway
合唱編曲/周鑫泉

指揮：陳雲紅
鋼琴：王乃加
演出：台北室內合唱團
2015.05.06 台北中山堂
2015〈聽你‧聽我〉尋愛之旅 ─送愛進家扶

www.tcschoir.org.tw
FB: 台北室內合唱團

曲解/鄭逸伸
林海音(1918-2001)自傳體小說《城南舊事》裡，小女孩林英子隨父母漂洋過海來到北京，以孩子的眼界觀看身旁人事物：會館門前的瘋女人、玩伴妞兒、朝夕相伴的乳母宋媽、沉痾染身終眠地下的慈父，他們都和…

Chips and Cheese
Zhaoxin’s KX-7000
#ChipAndCheese

Telegraph | source
(author: Chester Lam)

Telegraph

Zhaoxin’s KX-7000

Zhaoxin is a Chinese x86 CPU designer. The KaiXian KX-7000 is Zhaoxin’s latest CPU, and features a new architecture dubbed “世纪大道”. 世纪大道 is a road in Shanghai called “Century Avenue”, following Zhaoxin’s practice of naming architectures after Shanghai landmarks.…

▓▓▓▓▓▓░░░░░░░░░░░░░░ 30%

dramforever's blog
Slide rules approximating Vernier scales

Telegraph | source

Telegraph

Slide rules approximating Vernier scales

Slide rules are amazing. Even though nowadays we carry around in our pockets a computer with power unfathomed in the last century, I still think slide rules are a wonderful way to manipulate proportions in the analog domain. In fact, I regularly carry one…

Arch Linux: Recent news updates
Valkey to replace Redis in the [extra] Repository

Valkey, a high-performance key/value datastore, will be replacing redis in the [extra] repository. This change is due to Redis modifying its license from BSD-3-Clause to RSALv2 and SSPLv1 on March 20th, 2024[0].

Arch Linux Package Maintainers intend to support the availability of the redis package for roughly 14 days from the day of this post, to enable a smooth transition to valkey. After the 14 day transition period has ended, the redis package will be moved to the AUR. Also, from this point forward, the redis package will not receive any additional updates and should be considered deprecated until it is removed.

Users are recommended to begin transitioning their use of Redis to Valkey as soon as possible to avoid possible complications after the 14 day transition window closes.

[0] https://github.com/redis/redis/commit/0b34396924eca4edc524469886dc5be6c77ec4ed

source
(author: Andrew Crerar)

Important open source projects should not use GitHub (2020) https://unixdigest.com/articles/important-open-source-projects-should-not-use-github.html

Chips and Cheese
RDNA 4’s Raytracing Improvements
#ChipAndCheese

Telegraph | source
(author: Chester Lam)

Telegraph

RDNA 4’s Raytracing Improvements

Raytraced effects have gained increasing adoption in AAA titles, adding an extra graphics quality tier beyond traditional “ultra” settings. AMD has continuously advanced their raytracing implementation in response. Often, this involved fitting the GPU’s general…

Daniel Lemire's blog
Detect control characters, quotes and backslashes efficiently using ‘SWAR’

Telegraph | source

Telegraph

Detect control characters, quotes and backslashes efficientl…

When trying to write fast functions operating over many bytes, we sometimes use ‘SWAR’. SWAR stands for SIMD Within A Register, and it is a technique to perform parallel computations on multiple data elements packed into a single word. It treats a register…

通知：由于美国加征关税，GitHub访问响应码现已从200上调至403

Matt Keeter
A warning story about continuity

source
(author: Matt Keeter ([email protected]))

Daniel Lemire's blog
How can really smart people appear totally incompetent?

Telegraph | source

Telegraph

How can really smart people appear totally incompetent?

It is often puzzling to encounter organizations run by highly capable and ambitious people… appear dysfunctional. An example that I like are colleges that claim to provide great learning experience… while providing their students with recycled lectures given…

杰哥的{运维，编程，调板子}小笔记
如何进行条件分支预测器实验

Telegraph | source

Telegraph

如何进行条件分支预测器实验

如何进行条件分支预测器实验¶ 背景¶ 最近针对各种条件分支预测器（Conditional Branch Predictor）做了在各种 benchmark 上的实验，在此记录一下做这个实验的流程。 流程¶ 说到做条件分支预测器实验，到底是做什么呢？其实就是针对未来的处理器中的条件分支预测器的设计，在提前准备好的一些 benchmark 上进行模拟，观察它的预测准确性。既然是未来的处理器，那么硬件肯定是没有的，如果直接用 RTL 去实现新的预测器，再用 RTL 仿真，结果固然准确，但这还是太复杂并且太慢了…