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LLVM for Grad Students (2015)
LLVM is a godsend of a research tool. Here are some detailed notes on what LLVM is, why you would want to use it for research, and how to get started as a compiler hacker.
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Microsoft cURLs too
On December 19 2017, Microsoft announced that since insider build 17063 of Windows 10, curl is now a default component. I've been away from home since then so I haven't really had time to sit down and write and explain to you all what this means, so while I'm a bit late, here it comes! … Continue reading Microsoft…
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How LLVM Optimizes a Function
This is very nice summary of IR Passes. I found “InstCombine” pass to be easier to start with to understand the code flow in LLVM IR Pass. Maybe the beginners can start with that first.
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Writing a Microservice in Rust
Musings on navigating the tech bubble with philosophy and self-improvement.
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How to Manage Connections Efficiently in Postgres, or Any Database
Hitting the limit for maximum allowed connections is a common operational problem in Postgres. Here we look at a few techniques for managing connections and making efficient use of those that are available.
186
How I've built a profitable Slack bot as a side project in Rails
I've built a Slack anonymous messaging bot in Ruby on Rails and it is profitable. In this blog post I will describe what I did and tools I used to create, promote and monetize a simple SAAS product.
187
Escaping Hell with Monads (2017)
As programmers we occasionally find ourselves in “Programmer’s Hell”, where our regular abstractions fail to satisfactory solve certain recurrent problems.
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Implementing FizzBuzz on an FPGA
I recently started FPGA programming and figured it would be fun to use an FPGA to implement the FizzBuzz algorithm. An FPGA ( Field-Progra...
189
An opinionated guide to Haskell
For me, this month marks the end of an era in my life: as of February 2018, I am no longer employed writing Haskell. It’s been a fascinating two years, and while I am excitedly looking forward to what I’ll be doing next, it’s likely I will continue to write Haskell in my spare time. I’ll probably even write it again…
190
A little-known C feature: Static array indices in parameter declarations (2013)
Explanation of a little known C feature – and yet another use of the “static” keyword!
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Fridge 0.1
Imagine something really cool, like a fridge connected to a powerwall, powered entirely by solar panels. What could be cooler than that?
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Apps for which macOS applies compatibillity fixes
What do Photoshop, Matlab, Panic Transmit, and Eclipse have in common? They are among the 299 apps for which macOS applies compatibillity fixes.
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“But didn't you write an embedded OS?”
I have been job hunting in the last 2 months or so. Thankfully, I am settled with a company I admire now, and it seemed like I had more luck than the average job applicant. But among the handful of companies that I had the pleasure to interview with, I had my fair share of interesting moments.
194
What I learned in 2017 writing Go
A little over a year ago, I joined Cloud Foundry to work on Loggregator , Cloud Foundry's application logging component. Its core concern is best-effort log delivery without pushing back on upstream writers. Loggregator is written entirely in Go.
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Generating random points inside a sphere
Visualization of different methods of generating random points inside a sphere
197
7-Zip: Multiple Memory Corruptions via RAR and ZIP
Blog about anti-virus software vulnerabilities.
198
Introduction to Go Modules
Random thoughts
199
Regular Expressions – Mastering Lookahead and Lookbehind
Regex Lookahead and Lookbehind Tutorial. Explains the fine details of Lookahead and Lookbehind, including zero-width matches, overlapping matches and atomicity.
200
D compilation is too slow and I am forking the compiler
While working on my current project, the constant creep of increasing compilation times was becoming more and more noticeable. Even after throwing my usual tools at the problem, the total time was still over 7 seconds.
201
Exploring the .NET Core Runtime
It seems like this time of year anyone with a blog is doing some sort of ‘advent calendar’, i.e. 24 posts leading up to Christmas. For instance there’s a F# one which inspired a C# one (C# copying from F#, that never happens 😉)
202
24-core CPU and I can’t type an email – part two
In my last post I promised to give more details about some rabbit holes that I went down during the investigation, including page tables, locks, WMI, and a vmmap bug. Those details are here, along …
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What Is Systems Programming, Really?
I have a gripe with the phrase
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Computer science as a lost art (2015)
An old friend of mine asked me this in email last night...
206
Compiler bug? Linker bug? Windows Kernel bug
See the end of the post for an October 2018 bug fix update, or read the whole story: Flaky failures are the worst. In this particular investigation, which spanned twenty months, we suspected hardwa…
207
Tensorflow 2.0: models migration and new design
Tensorflow 2.0 will be a major milestone for the most popular machine learning framework: lots of changes are coming, and all with the aim of making ML accessible to everyone. These changes, however, require for the old users to completely re-learn how to use the framework: this article describes all the (known)…
208
A Virtual Machine
Magicians protect their secrets not because the secrets are large and important, but because they are so small and trivial. The wonderful effects created on stage are often the result of a secret so absurd that the magician would be embarrassed to admit that that was how it was done.
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A collection of things that are Turing-complete by accident (2013)
A list of things that were not supposed to be Turing-complete, but are.
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Why Isn't Debugging Treated as a First-Class Activity?
Robert O'Callahan. Christian. Kiwi. Software guy. All content human-authored unless otherwise noted.