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Floating-Point Determinism (2013)
Is IEEE floating-point math deterministic? Will you always get the same results from the same inputs? The answer is an unequivocal “yes”. Unfortunately the answer is also an unequivocal “no”. I’m a…
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Differential Synchronization (2009)
Keeping two or more copies of the same document synchronized with each other in real-time is a complex challenge. This paper describes the differential synchronization algorithm. Differential synchronization offers scalability, fault-tolerance, and responsive collaborative editing across an unreliable network.
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Measuring context switching and memory overheads for Linux threads
In this post I want to explore the costs of threads on modern Linux machines, both in terms of time and space. The background context is designing high-load concurrent servers, where using threads is one of the common schemes .
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Game Engine Black Book: Wolfenstein 3D, 2nd Edition
The Game Engine Black Book Wolfenstein 3D, 2nd Edition has shipped. It is available at the following locations: - Amazon ( US , UK , FR , CA , and many more). - Google PlayStore ( here ). All errata which readers kindly took the time to report have been addressed. Adrian Carmack has retired from anything related to id…
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On Vigna's PCG Critique
On 14 May 2018, Sebastiano Vigna added a page to his website (archived here) entitled “The wrap-up on PCG generators” that attempts to persuade readers to avoid various PCG generators. That day, he al
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How to implement a basic ActivityPub server
Today we’ll be looking at how to connect the protocols powering Mastodon in the simplest way possible to enter the federated network. We will use static files, standard command-line tools, and some simple Ruby scripting, although the functionality should be easily adaptable to other programming languages. First…
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Beating JSON performance with Protobuf
Protobuf, the binary format crafted by Google, surpasses JSON performance even on JavaScript environments like Node.js/V8 and web browser...
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Sunsetting React Native
Due to a variety of technical and organizational issues, we will be sunsetting React Native and putting all of our efforts into making…
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GitLab + Google Cloud Platform = simplified, scalable deployment
We’ve teamed up with Google Cloud Platform – here’s what that means for you.
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PEP 572 – Assignment Expressions
This is a proposal for creating a way to assign to variables within an expression using the notation NAME := expr.
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Part 1: Merging and patches
A recent paper suggested a new mathematical point of view on version control. I first found out about it from pijul, a new version control system (VCS) that ...
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NCEES discontinuing PE Software Engineering exam
NCEES will discontinue the Principles and Practice of Engineering (PE) Software Engineering exam after the April 2019 exam administration. Since the original offering in 2013, the exam has been administered five times, with a total population of 81 candidates. Only 19 candidates registered for the April 2018…
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The Practical Test Pyramid
Find out what kinds of automated tests you should implement for your application and learn by examples what these tests could look like.