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Paper review: IPFS – Content addressed, versioned, P2P file system
This week we discussed the IPFS whitepaper by Juan Benet in my Distributed Systems Seminar. Remember peer-to-peer systems? IPFS is "pe...
New
The latest blog posts to take off on Hacker News. 4,389 posts.
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Reading bits in far too many ways
Resurrecting an old tradition of this blog, let’s take a simple problem, go over a way too long list of alternative solutions, and evaluate their merits. Our simple problem is this: we want t…
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I.MX7 M4 Atomic Cache Bug
Hardware Bugs can be frustrating, as they are likely the last place you would expect a bug. Unfortunately, they can and do happen. Most likely every CPU has a list of erratas. This post outlines th…
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The Two Faces of AMP
Tim Kadlec writes about performance, product management, and the web.
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Picking Apart the Crashing iOS String
So there’s yet another iOS text crash, where just looking at a particular string crashes iOS. Basically, if you put this string in any system text …
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Spectre Mitigations in Microsoft's C/C++ Compiler
This form of Spectre can be used to attack a broad range of software -- operating systems, device drivers, web APIs, database systems, and almost anything else that receives untrusted input and may run on the same computer as untrusted code. Because large programs can contain literally millions of conditional branches…
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Dtrace for Linux
Not explicitly mentioned in that talk, but certainly the most exciting thing, is that Oracle is doing a proper linux kernel port:
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LLVM’s garbage collection facilities and SBCL’s generational GC
Intro, overview
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Speeding Up Ruby with Shared Strings
It’s not often I am able to write a patch that not only reduces memory usage, but increases speed as well. Usually I find myself trading memory for speed, so it’s a real treat when I can improve both in one patch. Today I want to talk about the patch I submitted to Ruby in this ticket. It decreases “after boot” memory…
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Zombie Processes Are Eating Your Memory
Zombies probably won’t consume 32 GB of your memory like they did to me, but zombie processes do exist, and I can help you find them and make sure that developers fix them. Tool source link is at t…
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Strace – My Favourite Secret Weapon (2011)
I’m often asked in my technical troubleshooting job to solve problems that development teams can’t solve. Usually these do not involve knowledge of API calls or syntax, rather some kind of insight into what the right tool to use is, and why and how to use it. Probably because they’re not taught in college, developers…
3103
E-Stop and Fuel, software that keeps you awake at night
Computer code that I’m writing usually doens’t keep me up at night. After all, it’s only bits & bites and if something doesn’t work properly you can always fix it, that’s the beauty of software.
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Feasibility of low-level GPU access on the Web
This is a follow up to Defining the Web platform post from a year ago. It doesn’t try to answer questions but instead attempts to figure out what are the rig...
3105
Anatomy of a Ceph meltdown
Last week, the server farm of our LMU Student Council had a major downtime over almost five days. As part of the administrator team there, I’d like to publish this post mortem to share our experiences and lessons learned to avoid situations like this in the future.
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Meltdown Initial Performance Regressions
KPTI/KAISER Meltdown Initial Performance Regressions
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Minimodem – General-purpose software audio FSK modem (2016)
Minimodem can play and capture audio modem tones in real-time via the system audio device, or in batched mode via audio files.
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Spectre/Meltdown Pits Transparency Against Liability
There is a lot of righteous anger directed toward Intel over CPU bugs that were revealed by Spectre/Meltdown. I agree that things could have been handled better, particularly with regards to transparency and the sharing of information among the relevant user communities that could have worked together to deploy…
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Lying to TCP makes it a best-effort streaming protocol
In this All Things Linguistic post Gretchen and Lauren introduce a model dialogue:
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Programming the Linux Framebuffer
Previously , I installed Linux on a small ARM Chromebook and set it up without X.Org, using only the console. After neglecting that machine for quite some time, I came back to it because I wanted to try some pixel-graphics programming and the framebuffer seemed like it might be an easy target.
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Why Create a New Unix Shell?
Please read this update instead: Why Create a New Unix Shell? (2021) . This page is obsolete!
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High Sierra broke AFP searching on our server
Update to this story at 20 Feb 2018: I’ve been debugging the problem together with Apple and I feel like we are closing in on a solution. My current guess is that Finder indexing needs a lot more time on High Sierra than on Sierra clients.
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Outperforming LAPACK with C++ metaprogramming
Still not really about LAPACK. It's a second part of the “outperforming” series explaining how the C++ metaprogramming can appear useful for efficient code generation.
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Paxos derived
Lamport's fault-intolerant state machine replication algorithm In 1978, Lamport published his classic "Time, Clocks, and the Ordering of E...
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Understanding the C/C++ memory model
I know that a lot of people struggle with understanding the memory model introduced in C11/C++11. In a recent conversation I was alerted to the existence of this blog post, which while correct (by …
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Reducing Memory Usage in Ruby
I’ve been working on building a compacting garbage collector in Ruby for a while now, and one of the biggest hurdles for implementing a compacting GC is updating references. For example, if Object A points to Object B, but the compacting GC moves Object B, how do we make sure that Object A points to the new location?…