Why Modern Software is Slow–Windows Voice Recorder
I apologize for this title because there are many things that can make modern software slow. Blindly applying one explanation without a bit of investigation is the software equivalent of a cargo cult. That said, this post describes one example of why modern software can be painfully slow. All I wanted was to record a forty-second voiceover for a throw-away video, so I fired up the Windows Voice Re
63 Cores Blocked by Seven Instructions
Forecast for randomascii: programming, tech topics, with a chance of unicycling I seem to have a habit of writing about super powerful machines whose many cores are laid low by misuse of locks. So. Yeah. It’s that again. But this one seems particularly impressive. I mean, how often do you have one thread spinning for several seconds in a seven-instruction loop while holding a lock that stops sixty
24-core CPU and I can’t type an email (part two)
Forecast for randomascii: programming, tech topics, with a chance of unicycling 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 with updated code samples. But first, a really quick summary of the original issue: In the last post I talked about how eve
24-core CPU and I can’t type an email (part one)
Forecast for randomascii: programming, tech topics, with a chance of unicycling I wasn’t looking for trouble. I wasn’t trying to compile a huge project in the background (24-core CPU and I can’t move my mouse), I was just engaging in that most mundane of 21st century tasks, writing an email at 10:30 am. And suddenly gmail hung. I kept typing for several seconds but no characters were appearing on
Comparing Floating Point Numbers, 2012 Edition
Forecast for randomascii: programming, tech topics, with a chance of unicycling This post is a more carefully thought out and peer reviewed version of a floating-point comparison article I wrote many years ago. This one gives solid advice and some surprising observations about the tricky subject of comparing floating-point numbers. A compilable source file with license is available. We’ve finally
Debugging Optimized Code–New in Visual Studio 2012
Forecast for randomascii: programming, tech topics, with a chance of unicycling For years (decades?) one of the most requested features in Visual C++ has been better support for debugging optimized code. Visual Studio’s debug information is so limited that in a program that consists just of main(argc, argv) the VS debugger can’t accurately display argc and argv in an optimized build. All I wanted
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32 MiB Working Sets on a 64 GiB machine
Floating Point in the Browser, Part 2: Bad Epsilon