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New
The latest blog posts to take off on Hacker News. 4,390 posts.
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How both TCP and Ethernet checksums fail (2015)
At Twitter, a team had a unusual failure where corrupt data ended up in memcache. The root cause appears to have been a switch that was corrupting packets. Most packets were being dropped and the throughput was much lower than normal, but some were still making it through. The hypothesis is that occasionally the…
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A Deep Dive into HandBrake and Video Transcoding
An obvious interest area of mine is in ripping (and watching) movies using my Mac. I've talked about everything from installing the tools I use to how I rip to how to make sure I update the ripping tools . And though I've included some comparison pictures in the how-I-rip article, I've never done a deep dive into the…
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Summary of the 1.1 Billion Taxi Rides Benchmarks
Benchmarks & Tips for Big Data, Hadoop, AWS, Google Cloud, PostgreSQL, Spark, Python & More...
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1.1B Taxi Rides on Kdb+/q and 4 Xeon Phi CPUs
Benchmarks & Tips for Big Data, Hadoop, AWS, Google Cloud, PostgreSQL, Spark, Python & More...
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Thoughts on the Systemd Root Exploit
Sebastian Krahmer of the SUSE Security Team has discovered a local root exploit in systemd v228 . A local user on a system running systemd v228 can escalate to root privileges. That's bad.
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Chrome will aggressively throttle background tabs
[Jan 26, 7:25am]: Google has responded to this article and the plans for throttling: Unfortunately, our current implementation throttles...
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Delete an inline function, save 794 kB
In the previous episode of “Simple Changes to Shrink Chrome” I discussed how deleting ‘const’ from a few key locations could lead to dramatic size savings, due to a VC++ com…
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How quickly can you remove spaces from a string?
Sometimes programmers want to prune out characters from a string of characters. For example, maybe you want to remove all line-ending characters from a piece of text. Let me consider the problem where I want to remove all spaces (' ') and linefeed characters ('\n' and '\r'). How would you do it efficiently? size_t…
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What Happens to OO When Processors Are Free? (2015)
A while ago, I presented as a crazy thought experiment the idea of using Montecito's transistor budget for creating a chip with tens of tho...
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Systemd Sucks, Long Live Systemd
systemd seems to be a dividing force in the Linux community. There doesn’t seem to be a middle ground to...
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Add a const here, delete a const there
Update, February 2019: Two years later the VC++ bug I reported here still exists, even in VS 2019 preview. However Chromium no longer builds with VC++ so I’m reverting the changes where I del…
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Research papers in the .NET source
This post is completely inspired by (or ‘copied from’ depending on your point of view) a recent post titled JAVA PAPERS (also see the HackerNews discussion). However, instead of looking at Java and the JVM, I’ll be looking at references to research papers in the .NET language, runtime and compiler source code.
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Select(2) is fundamentally broken
In a previous blog post we discussed a brief history of the select(2) syscall . The article concludes that some I/O multiplexing was necessary to do console emulation, games and non-trivial TCP/IP applications.
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Goroutines, Nonblocking I/O, and Memory Usage
I am generally a fan of Go's approach to concurrency: writing code with goroutines is a lot easier than writing traditional nonblocking network servers in a language like C or C++. However, while working on a highly concurrent network proxy I came across an interesting realization about how the Go concurrency model…
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Lock-Free Bugs
[ I wrote this post in mid-2014 for debuggers.co, which seems to have gone at least partly defunct, so I am reproducing it here. That site collected answers from programmers to the prompt “What’s the most interesting bug you’ve encountered?” ]
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Why isn't memset() async-signal-safe?
Really, POSIX? Really? memset() isn't async-signal-safe? How is it not safe? … oh … that's why
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Systems Past: software innovations we actually use (2014)
Note: This is a position piece, not a technical article. Hat tip to Jake Skelcy for requesting such a piece. Computers didn’t always have operating …
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Golang data races to break memory safety
Go is becoming more and more popular as a programming language and getting more scrutiny from a security point of view. You might remember m...
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Getting Started with Tokio
If you're interested in writing servers in Rust, Tokio is a project that should definitely be on your radar. It promises to leverage the exciting new work on futures in Rust to make it easy to build extremely efficient networked servers with natural, composable code.
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The State of Linux Security
This is the state of Linux security. With the most important updates around Linux and open source security. From conferences to self-protection.
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