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32-bit x86 Position Independent Code – It's That Bad
Let's start by looking at a simple C function to be compiled as position-independent code (i.e. -fPIC , for use in a shared library):
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The latest blog posts to take off on Hacker News. 4,390 posts.
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Run your own high-end cloud gaming service on EC2
NOTE: This article has been superseded by my more recent one here
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Solaris adopting OpenBSD's pf
Yet another proprietary tech titan turns to the free OpenBSD operating system as their source of innovation in the networking and security ...
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A few spy tools for your operating system (other than strace)
A few spy tools for your operating system (other than strace!)
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HPC is dying, and MPI is killing it
R&D computing at scale
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My favorite bug: segfaults in Java
Update: Two years later, I wrote a more detailed version of this article: My favorite bug: segfaults in Java (redux) .
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Notes from Facebook's Developer Infrastructure at Scale F8 Talk
Any time Facebook talks about technical matters I tend to listen. They have a track record of demonstrating engineering leadership in several spaces. And, unlike many companies that just talk, Facebook often gives others access to those ideas via source code and healthy open source projects. It's rare to see a company…
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The Four Month Bug: JVM statistics cause garbage collection pauses
TL;DR: The JVM by default exports statistics by mmap -ing a file in /tmp (hsperfdata). On Linux, modifying a memory mapped file can block until disk I/O completes, which can be hundreds of milliseconds. Since the JVM modifies these statistics during garbage collection and safepoints, this causes pauses that are…
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Is Your VirtualBox Reading Your E-Mail? Reconstruction of FrameBuffers from VRAM
This document describes a method of reading and displaying previously used framebuffers from a variety of popular graphics cards. In all 4 tested laptops the content of the VRAM was not erased upon reboot. It is also possible to show that the content of the host VRAM can be accessed from a VirtualBox guest, thereby…
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Why Are Geospatial Databases So Hard to Build?
In 2005, I decided to design my first geospatial database engine. PostGIS was unable to keep up with the modest volumes of sensor data I was working with and while I was new to geospatial data, I had skill designing database engines. It seemed simple enough to get the scale and performance I required. Nothing could…
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Is the Mill CPU real? (2014)
I’ve seen the Mill CPU come up a number of times — maybe because I subscribed to their updates and so I get emails about their talks. They’re getting a bunch of buzz, but every t…
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10Gbit/s full TX wirespeed smallest packet size on a single CPU core
The Linux Kernel Network Stack Scalability, mitigating DDoS attacks firewalling iptables netfilter connection tracking (conntrack)
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84% of a single-threaded 1KB write in Redis is spent in the kernel
Alex Clemmer is a computer programmer. Other programmers love Alex, excitedly describing him as "employed here" and "the boss's son".
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