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Queueing in the Linux Network Stack
Things that interest me
New
The latest blog posts to take off on Hacker News. 4,390 posts.
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A Unix Utility You Should Know About: Netcat (2009)
This is the second post in the article series about Unix utilities that you should know about. In this post I will introduce you to the netcat tool or simply nc. Netcat is often referred to as a Swiss Army knife utility, and for a good reason. Just like the multi-function usefulness of the venerable Swiss Army…
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Jepsen: On the perils of network partitions
This article is part of Jepsen , a series on network partitions. We’re going to learn about distributed consensus, discuss the CAP theorem’s implications, and demonstrate how different databases behave under partition.
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ZeroMQ instead of HTTP, for internal services
A post by August Lilleaas, published July 22, 2013.
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Each socket should have two file descriptors
What if, instead of running a process-data program on this machine, we want to run it on another machine? No problem. We make a TCP connection to a process-data server on the remote machine. On the local machine, we have generate-data writing to the TCP connection, and consume-data reading from the TCP connection…
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The Raspberry Pi’s Hardware Random Number Generator
Hey! This is a bit old! Things may have changed and I haven’t necessarily fixed them. Most computers can’t create true random numbers. They use a formula which makes a very long stream …
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Systemd is not portable and what this means for our ports
This blog post is the third of a series of posts dealing with the results of the Debian systemd survey . I intend to give a presentation at DebConf 2013, too, so you could either read my posts, or watch the talk, or both :-).
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Communicating Sequential Processes
With the arrival of core.async , ClojureScript provides a powerful advantage over other popular compile to JavaScript languages like CoffeeScript , Dart , and TypeScript . These languages fail to address the single largest source of incidental complexity for any sizeable client side application - concurrency. In my…
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Windows Timer Resolution: Megawatts Wasted
The default timer resolution on Windows is 15.6 ms – a timer interrupt 64 times a second. When programs increase the timer frequency they increase power consumption and harm battery life. They also…
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The Go 1.1 scheduler
One of the big features for Go 1.1 is the new scheduler, contributed by Dmitry Vyukov. The new scheduler has given a dramatic increase in performance for parallel Go programs and with nothing better to do, I figured I'd write something about it.
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A Memory Comparison of Light Linux Desktops
In my previous article I’ve tried to investigate the RAM memory requirements for running some of the most common light window managers and desktop environments available in the Linux world. P…
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How FPGAs work, and why you'll buy one
Today, pretty much everyone has a CPU, a DSP and a GPU, buried somewhere in their PC, phone, car, etc. Most don't know or care that they bought any of these, but they did.
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Real-Time Garbage Collection Is Real
Real-Time Garbage Collection (RTGC) tests the limits of what we typically think is possible in production software. You might hear “Real-Time” and “Garbage Collection” together and think “If you truly need real-time guarantees, why would you use a garbage collected language?” or “How is real-time Garbage Collection…
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The network is reliable
I’ve been discussing Jepsen and partition tolerance with Peter Bailis over the past few weeks, and I’m honored to present this post as a collaboration between the two of us. We’d also like to extend our sincere appreciation to everyone who contributed their research and experience to this piece.
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CUDA grep
CUDA grep : Manish and Brandon's 15418 final project
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SSH uses four TCP segments for each character you type
Every time we press a key in an interactive SSH session, the SSH Client sends that keystroke as a TCP segment to the SSH Server. Here is a Wireshark …
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Non-blocking transactional atomicity
tl;dr: You can perform non-blocking multi-object atomic reads and writes across arbitrary data partitions via some simple multi-versioning and by storing metadata regarding related items.
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The Biggest Myths
Posts and writings by Lennart Poettering
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Ifs and &&s and Plan 9's Source Code
Spiros Eliopoulos. Blog Posts, Projects, Past Gigs, & Publications.
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Go 1.1 performance improvements
This is the first in a series of articles analysing the performance improvements in the Go 1.1 release.
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Call me maybe: final thoughts
Previously in Jepsen , we discussed Riak . Now we’ll review and integrate our findings.
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Jepsen: Postgres
Previously on Jepsen , we introduced the problem of network partitions . Here, we demonstrate that a few transactions which “fail” during the start of a partition may have actually succeeded.
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Jepsen: Redis
Previously on Jepsen , we explored two-phase commit in Postgres . In this post, we demonstrate Redis losing 56% of writes during a partition.
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Fish shell 2.0
fish 2.0 is now released! fish is a fully-equipped command line shell (like bash or zsh) that is smart and user-friendly. fish supports powerful features like syntax highlighting, autosuggestions, and tab completions that just work, with nothing to learn or configure.