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SSE: mind the gap
SSE and SSE2 are available in every single x86-family CPU with 64-bit support. You too can play around with SIMD, which is great fun! Unfortunately, SSE2 level in particular also happens to be what…
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The latest blog posts to take off on Hacker News. 4,390 posts.
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Hotpatching a C Function on x86
In this post I’m going to do a silly, but interesting, exercise that should never be done in any program that actually matters. I’m going write a program that changes one of its function definitions while it’s actively running and using that function. Unlike last time , this won’t involve shared libraries, but it will…
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Ubuntu on Windows -- The Ubuntu Userspace for Windows Developers
Update: Here's how to get started using Ubuntu on Windows See also Scott Hanselman's blog here I'm in San Francisco this week, attendin...
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Ubuntu on Windows
Update: Here's how to get started using Ubuntu on Windows See also Scott Hanselman's blog here I'm in San Francisco this week, attendin...
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Stack Overflow: The Hardware – 2016 Edition
This is #2 in a very long series of posts on Stack Overflow’s architecture.Previous post (#1): Stack Overflow: The Architecture - 2016 EditionNext post (#3...
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Thread pools: How do I use them?
Thread pools! How do I use them?
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Compiler Bugs Found When Porting Chromium to VC++ 2015
Moving a big software project to a new compiler can be a lot of work, and few projects are bigger than Chromium. In addition to the main Chromium repository, which includes all of Blink, there are …
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ODROID-C2 Compared to Raspberry Pi 3 and Orange Pi Plus
tl;dr: The ODROID-C2 is a very solid competitor to the Raspberry Pi model 3 B, and is anywhere from 2-10x faster than the Pi 3, depending on the operation. The software and community support is nowhere near what you get with the Raspberry Pi, but it's the best I've seen of all the Raspberry Pi clones I've tried. The…
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FreeBSD – a lesson in poor defaults
This page lists some of the changes I make to a vanilla install of FreeBSD for security hardening. Some changes to increase network performance or make things a bit more sane are also included. It only covers basic changes that a sysadmin can make to a running system.
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No More Full Table Vacuums in PostgreSQL
I just committed a very important patch to PostgreSQL. The short summary for the patch is " Don't vacuum all-frozen pages. " and it follows...
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Power Wastage on an Idle Laptop
Ever since I upgraded to Windows 10 it’s felt like my battery life is worse. My suspicion was various scanning tasks that were springing to life more frequently, but it was just a hunch. So, …
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Big News for ZFS on Linux
Canonical announced a few weeks ago that ZFS will be included in the next release of Ubuntu Linux, on by default and fully supported. And it’s no exaggeration…
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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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All Software is Legacy
In what may be judged in years to come as a moment of madness, I have volunteered to be the primary maintainer of the Perl CGI module (CGI.pm). For the non-technical readers of this post: CGI.pm is a few thousand lines of code that in the mid to late nineties, and even some years later, was helping many websites…
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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 is the FS for Containers in Ubuntu 16.04
Ubuntu 16.04 LTS (Xenial) is only a few short weeks away , and with it comes one of the most exciting new features Linux has seen in a ve...
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Stack Overflow: The Architecture – 2016 Edition
This is #1 in a very long series of posts on Stack Overflow’s architecture. Welcome.Previous post (#0): Stack Overflow: A Technical DeconstructionNext post...
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Linux kernel bug delivers corrupt TCP/IP data
(Edit: This article is now up on hacker news, feel free to discuss there)