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Building a unikernel that runs WebAssembly – part 1
Hackweek 22 took place last week. During this week all the SUSE employees are free to hack on whatever they want. This one of the perks of working at SUSE 😎.
Topics /
Systems & Performance
The most popular blog posts about systems & performance on Hacker News. 6,942 posts.
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Compiling my own SPARC CPU inside a cheap FPGA
Compiling a CPU, in a cheap FPGA board
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OpenBSD on a Laptop
A guide to a secure and streamlined installation of OpenBSD 6.4 on a laptop.
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Fast UTF-8 validation
One of the most common "data type" in programming is the text string. When programmers think of a string, they imagine that they are dealing with a list or an array of characters. It is often a "good enough" approximation, but reality is more complex. The characters must be encoded into bits in some way. Most ……
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Why is the x86 undefined instruction called ud2? Why 2?
It came after ud0 and ud1.
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The Ethernet PAUSE frame
This is a bizarre one. It all started when the internet seemed to go out at my house. My desktop, phone, TV, everything stopped working. The usual solution at a time like this is to power cycle the modem and router. While this fixed the situation temporarily, soon after the problem returned. What made me think this…
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Antenna Diodes in the Pentium Processor
I was studying the silicon die of the Pentium processor and noticed some puzzling structures where signal lines were connected to the silico...
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C and C++ prioritize performance over correctness
The original ANSI C standard, C89, introduced the concept of “undefined behavior,” which was used both to describe the effect of outright bugs like accessing memory in a freed object and also to capture the fact that existing implementations differed about handling certain aspects of the language, including use of…
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Why does everyone run ancient Postgres versions?
Many companies are running old Postgres versions and missing out on many improvements. The reasons: Postgres works and upgrades suck.
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Canonical releases Ubuntu 16.10
Ubuntu 16.10 released with Hybrid Cloud Operations and Unity 8 developer preview, from Canonical MAAS 2.0 delivers robust, highly-available IPAM and bare-metal provisioning Hybrid cloud operations with Juju 2.0 Developer preview of Unity 8 includes desktop, tablet and phone UX convergence OpenStack Newton with secure…
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Opening Windows in Linux with sockets, bare hands and 200 lines of C
In this post I want to create a single file C file program to open a windows inside Linux without using xlib or any similar libraries. The idea is to explore X11 protocol and see how it is used to interact with X server to create windows.
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In praise of memcached
If you happen to find yourself in a sysadmin position, or a position where you just so happen to maintain someone’s infrastructure , chances are that at some point in time the topic “we need a cache” comes up.
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Sysadmin friendly high speed Ethernet switching
I’ve been on the lookout for a ethernet switch that I don’t hate, the problem with a lot of higher speed (10G and above) ethernet switches is that they are quite expensive new and if you buy the used then they rarely have many years left ( or none at all ) of software patches.
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Userspace isn't slow, some kernel interfaces are
Discover how recent improvements to wireguard-go boost Tailscale client performance on Linux. Learn about key changes, testing methods, and results showing enhanced throughput and efficiency.
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Better Random Number Generation for OpenSSL, Libc, and Linux Mainline
中文版 In 2015, AWS introduced s2n, a new open source implementation of the TLS/SSL protocols that protect the privacy and integrity of data moving over a network. s2n was designed to be secure, simple, small, and fast. The project is thriving, and we use it extensively. In February, our CISO Stephen Schmidt shared that…
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Scaling Kubernetes to 2,500 Nodes
Stay up to speed on the rapid advancement of AI technology and the benefits it offers to humanity.
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How much memory do you need in 2024 to run 1M concurrent tasks?
Please refer to How Much Memory Do You Need in 2024 to Run 1 Million Concurrent Tasks? - Take 2 to check the latest result.
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Spectre and the end of langsec
wingolog: article: spectre and the end of langsec
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I/O is no longer the bottleneck? (2022)
Recently Ben Hoyt published a blog post claiming that contrary to popular belief, I/O is not the bottleneck in typical programming interview problems such as counting word frequencies from a stream. Sequential read speed has come a long way, while CPU speed has stagnated.
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Linux: What Can You Epoll?
On Linux what can you turn into a file descriptor and then monitor with epoll?
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File systems unfit as distributed storage back ends: lessons from Ceph evolution
File systems unfit as distributed storage backends: lessons from 10 years of Ceph evolution Aghayev et al., SOSP’19 Ten years of hard-won lessons packed into just 17 pages (13 if you don’t co…
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Be your own VPN provider with OpenBSD
Blog about network and security, showing example of Linux iptables and Snort configuration, and Windows security softwares.
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Obscure audio codec is a perfect fit for the N64
Sorry for the clickbait title. I promise this post delivers: 44100 Hz stereo with near-Opus bitrates using about 4% of the N64’s CPU time.
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Can you slim macOS down?
In a quest to reduce the number of processes running in macOS Tahoe, consider the example of Time Machine backups, which can easily be replaced by 3rd party alternatives.