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Implementing Fast Interpreters
Many modern virtual machines include either a fast interpreter or a fast baseline compiler. A baseline compiler needs extra memory and is li...
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The latest blog posts to take off on Hacker News. 4,390 posts.
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Computed goto for efficient dispatch tables
Recently, while idly browsing through the source code of Python, I came upon an interesting comment in the bytecode VM implementation ( Python/ceval.c ) about using the computed gotos extension of GCC [1] . Driven by curiosity, I decided to code a simple example to evaluate the difference between using a computed goto…
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The Opposite of a Bloom Filter
A Bloom filter is a data structure that may report it contains an item that it does not (a false positive), but is guaranteed to report correctly if it contains the item (“no false negatives”). The opposite of a Bloom filter is a data structure that may report a false negative, but can never report a false positive…
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MySQL is bazillion times faster than MemSQL
I don’t like stupid benchmarks, as they waste my time. I don’t like stupid marketing, as it wastes my time too. Sometimes I succumb to those things, and now in return I want to waste yo…
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ZeroMQ - Disconnects are Good for You
The hidden disconnects of ZeroMQ can be dangerous if you don’t write your application to work around them.
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If you were involved in the OpenGL ES specification, you are an idiot
XScreenSaver 5.15 is out now. Along with the usual set of minor improvements, this version runs as an iOS application. As all of the 3D modules in XScreenSaver are written against the OpenGL 1.3 specification, and as the iPhone only supports OpenGL ES 1.1 and newer, this was something of a big deal. I accomplished…
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We Who Value Simplicity Have Built Incomprehensible Machines
It's not about technology for its own sake. It's about being able to implement your ideas.
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Memory Reordering Caught in the Act
When writing lock-free code in C or C++, one must often take special care to enforce correct memory ordering. Otherwise, surprising things can happen. Intel lists several such …
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TCP doesn't suck, and all the proposed bufferbloat fixes are identical
: While I'm suspicious of all JIT-compiled languages, C# has always had a much better IL than java, even since version 1.0, making it easy...
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Write hybrid CPU/GPU programs in Haskell
What’s better than programming a GPU with a high-level, Haskell-embedded DSL (domain-specific-language)? Well, perhaps writing portab...
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Line-by-line memory usage of a Python program
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The Treacherous Optimization
"I'm going to beat grep by thirty percent!" I confidently crow to anyone who would listen, those foolish enough to enter my office. And my girlfriend too, who's contractually obligated to pay attention to everything I say.
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This is the mail system
This is how we tell hundreds of millions of computer users that something has gone wrong:
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How a computer boots up
The previous post described [motherboards and the memory map] memory-map in Intel computers to set the scene for the initial phases of boot. Booting is an involved, hacky, multi-stage affair - fun st
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The byte order fallacy
Whenever I see code that asks what the native byte order is, it's almost certain the code is either wrong or misguided. And if the native b...
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Postgres 9.2 will feature linear read scalability up to 64 cores
Remember when I blogged about linear read scalability out to 32 cores ? Well, the awesome Nate Boley provided me with access to his brand n...
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Don’t Eat Too Much Three Bean Salad. The Server Will Crash.
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Linux 3.3: Finally a little good news for bufferbloat
While I was out chasing computer history last week, the Linux 3.3 kernel was released. And a very interesting release it is, though not for its vaunted re-inclusion of certain Android kernel hacks. I think that modest move is being overblown in the press. No, Linux 3.3 appears to be the first OS to really
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Consistent Hashing
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Java Tuning in a nutshell
While delivering a training recently, I got a request to put together a JVM tuning cheat sheet. Given the 50+ parameters available on the ...