IBM has published the following new technical articles, tutorials, and downloads on its DeveloperWorks and AlphaWorks websites. They cover a range of interesting (though not necessarily embedded) technical topics, primarily related to Linux and open source system development. Some require free registration. Enjoy . . . !

• Reduce Your Linux Memory Footprint — A lack of physical memory can severely hamper Linux performance. In this article, learn how to accurately measure the amount of memory your Linux system uses. You also get practical advice on reducing your memory requirements using an Ubuntu system as an example.
• Dive into the Xilinx ML403 Out-of-Box Experience — In this new series, Lewin Edwards unpacks the Xilinx ML403 Embedded Development Kit and sorts out some of its idiosyncrasies. Discover reasons you might choose an FPGA-based system over a traditional hard-IP microcontroller, and identify the learning curve programmers face when meeting RAM-based programmable logic for the first time.
• Share application data with UNIX system V IPC mechanisms — Identify methods that applications use to communicate with each other and use message queues, semaphores, and shared memory to connect your applications.
• Master the Bash Shell for the Linux Exam — In this fifth tutorial of nine in the series of Linux certification exam 102 topics, Ian Shields introduces you to scripts and programming in the Bash shell. Learn how to customize your shell environment, use shell programming structures to create functions and scripts, and use the various login scripts.
• Simple Install of a large Linux clusters — Create a working Linux cluster from many separate pieces of hardware and software. Part 1 of the series provides detailed instructions on setting up the hardware for the cluster. Part 2 describes configuring the management server and installing the nodes in the cluster. This provides an easy way to get started with large Linux clusters.
• The Basics of XSLT — Transform XML data from one format to another with Extensible Stylesheet Language Transformations (XSLT). This tutorial explains how to create XSLT stylesheets, and the basics of XPath, which enables you to select specific parts of an XML document.
• Essential Defensive programming with AOP — Defensive programming constructs have prevented many a defect, but the constructs themselves tend to litter code with repetitive logic. Combining defensive programming techniques with aspect-oriented programming is one way to keep the strong line of defense without all the repetitive coding. This article provides a multifaceted approach using the power of AOP, design by contract, and a handy library called OVal.
• Build Apache Derby database apps in JRuby — JRuby is an implementation of the Ruby programming language that runs in the Java Virtual Machine (JVM). Explore two ways to connect to and build Derby database applications from JRuby, and get pointers on when it's appropriate to use each approach.
• Hot Web 2.0 user interface technologies — We're entering an unprecedented period of user interface innovation, as Web developers are finally able to build Web applications as rich as local PC-based applications. This article covers the Web 2.0 user interface technology innovations of Flex, OpenLaszlo, Ajax and other Rich client and Rich Web application development.
• Offload content to Amazon using PHP — Save disk space and bandwidth, and increase the reliability of your site by using the Amazon Simple Storage Service (S3) remote storage service to host your media files. You'll also improve the reliability of your site as it serves the increasingly large multimedia files that are so popular in the Web 2.0 world.

 
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