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Here's to the systems programmers – Writing Hello World on a home brew CPU
Writing Hello World on a homebrew CPU
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Small, Freestanding Windows Executables
Recently I’ve been experimenting with freestanding C programs on Windows. Freestanding refers to programs that don’t link, either statically or dynamically, against a standard library (i.e. libc). This is typical for operating systems and similar, bare metal situations . Normally a C compiler can make assumptions…
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A Unikernel Firewall for QubesOS
QubesOS provides a desktop operating system made up of multiple virtual machines, running under Xen. To protect against buggy network drivers, the …
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Rust Performance: A story featuring perf and flamegraph on Linux
ramblings by Adam Perry
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In defense of Unix
While there may be some situations in which DOS has a better command, Unix works better overall.
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Distributed Systems Testing: The Lost World
After failing to find good papers about distributed systems testing for many months, yesterday I asked a question in Twitter:
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Getting Started with rkt
Minitest is a beautifully made test suite for writing tests to verify your expectations from your Ruby code base. Here's how to run tests in Minitest.
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Intro to Debugging X86-64 Assembly
I’m hacking on an assembly project, and wanted to document some of the tricks I was using for figuring out what was going on. This post might seem a little basic for folks who spend all day heads down in gdb or who do this stuff professionally, but I just wanted to share a quick intro to some tools that others may…
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My Distributed Systems Seminar's Reading List for Spring 2017
Below is the first draft list of papers I plan to discuss in my distributed systems seminar in the Spring semester. If you have some suggest...
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Appending to a file from multiple processes
Suppose you have multiple processes appending output to the same file without explicit synchronization. These processes might be working in parallel on different parts of the same problem, or these might be threads blocked individually reading different external inputs. There are two concerns that come into play:
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Whither Plan 9? History and motivation
Wherein the author discusses the Plan 9 operating system. First of several.
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Unikernel Profiling from dom0
Unikernel Profiling: Flame Graphs from dom0. This post investigates performance profiling of Unikernels, and with a proof of concept shows that with a little work a lot of observability is possible.
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You Compiled This, Driver – Trust Me
I was incredibly inspired by Tomasz Stachowiak’s hack of GCN . It made me wish I owned a GCN machine of my own to start trying insane things with. On the other hand, I dooo own an Intel Haswell GPU , and they dooo publish some really dense documentation that’s allegedly enough to write a complete driver with.
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A resizable concurrent map
In an earlier post, I showed how to implement the “world’s simplest lock-free hash table” in C++. It was so simple that you couldn’t even delete entries or …
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ZFS Licensing and Linux
We at Canonical have conducted a legal review, including discussion with the industry’s leading software freedom legal counsel, of the licenses that apply to the Linux kernel and to ZFS.And in doing so, we have concluded that we are acting within the r […]
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Android Full Disk Encryption Cold Boot Attack (2012)
At the end of 2011, Google released version 4.0 of its Android operating system for smartphones. For the first time, Android smartphone owners were supplied with a disk encryption feature that…
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Multi-byte NOP opcode made official
Welcome to the Developer Software Tools forum! Your collaborative hub to connect with fellow engineers, optimize code with Intel oneAPI and OpenVINO, share debugging breakthroughs, and extract maximum software performance.
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Understanding consensus and Paxos in distributed systems
A whirlwind tour on acheiving agreement in a distributed system
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Curl and http/2 on Mac
$ curl ‐‐http2 https://daniel.haxx.se/ curl: (1) Unsupported protocol curl on mac curl has been shipped by default on Mac OS X since many years - I actually couldn't even manage to figure out exactly how many. It is built and bundled with the operating system by Apple itself and on Apple's own terms and even ……
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RISC instruction sets I have known and disliked
Experienced professional software engineer based in York, UK