Easton Man's Channel

Easton Man's Channel

Sysadmin 3 surprising things Linux sysadmins can do with systemdalansmitheeThu, 03/23/2023 - 03:00 It's not just for making your computer boot faster. Download our new systemd eBook for Linux sysadmins for more tips. When it first started out, there was…

这玩意有点吵，unsub了

15:06 · Mar 23, 2023 · Thu

Sysadmin

3 surprising things Linux sysadmins can do with systemdalansmitheeThu, 03/23/2023 - 03:00
It's not just for making your computer boot faster. Download our new systemd eBook for Linux sysadmins for more tips.

When it first started out, there was a lot of press about systemd and its ability to speed up boot time. That feature had a mostly-universal appeal (it's less important to…

source
(author: alansmithee)

03:04 · Mar 23, 2023 · Thu

Chips and Cheese
Raytracing on AMD’s RDNA 2/3, and Nvidia’s Turing and Pascal
#ChipAndCheese

Telegraph | source
(author: clamchowder)

Telegraph

Raytracing on AMD’s RDNA 2/3, and Nvidia’s Turing and Pascal

Raytracing aims to accurately model light by following the paths of light rays and seeing what they hit. However, raytracing is quite expensive compared to say, calculating light values by taking a pixel’s distance to light sources and doing an inverse square…

ChipAndCheese

02:57 · Mar 23, 2023 · Thu

Daniel Lemire's blog
Can GPT pass my programming courses?

Telegraph | source

Telegraph

Can GPT pass my programming courses?

Professeur Caplan reports that ChatGPT, the new AI that is all the rage, can pass his economics midterm and get an A. What about computer science ? I submitted to GPT one problem I offer my students… Write a Java program that calculates the sum of numbers…

17:07 · Mar 22, 2023 · Wed

Enable Sysadmin
How to create multidomain web applications with Podman and Nginx

Learn how to use Podman and Nginx to work with applications from different domains on the same host.

source
(author: Alexon Oliveira)

05:56 · Mar 22, 2023 · Wed

Daniel Lemire's blog
Counting cycles and instructions on ARM-based Apple systems

Telegraph | source

Telegraph

Counting cycles and instructions on ARM-based Apple systems

In my blog post Counting cycles and instructions on the Apple M1 processor, I showed how we could have access to “performance counters” to count how many cycles and instructions a given piece of code took on ARM-based mac systems. At the time, we only had…

17:04 · Mar 21, 2023 · Tue

Enable Sysadmin
Not applying updates? You're doing it wrong

All your excuses for not doing updates—from fear of downtime to concerns about testing—are wrong.

source
(author: Scott McBrien)

17:02 · Mar 20, 2023 · Mon

Enable Sysadmin
Build a golden image for your RHEL homelab with Image Builder

Create customized templates for your Red Hat Enterprise Linux (RHEL)-based homelab that you can deploy repeatedly with automated upkeep.

source
(author: Eric "IT Guy" Hendricks)

12:24 · Mar 20, 2023 · Mon

#迷惑考研题大赏

迷惑考研题大赏

12:30 · Mar 19, 2023 · Sun

#今日看了什么
Passion: (from Latin pati "to suffer")
-- From Wikipedia

今日看了什么

13:16 · Mar 18, 2023 · Sat

Easton Man's Channel

22年我做一个在kp920上纠错码的kernel优化，当时就遇到各种奇怪的问题。典型的就是访存带宽的问题。另一个当时觉得匪夷所思的是向量性能很迷惑，当混杂向量指令和小循环时，整个处理器的性能会退化到接近顺序处理器的性能。现在看来很可能是调度队列大小+整数向量跨域前递的问题。

kp920这个corner case的情况已经不能叫corner case了，感觉一些日常的应用也需要人工汇编fine tune或者修改编译器才能避开性能黑点或者说达到预期性能