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Source: developerWorks : Linux : Technical library Linux kernel 2.6.25 introduced a new process state for putting processes
to sleep called TASK_KILLABLE, which offers an alternative to the efficient
but potentially unkillable TASK_UNINTERRUPTIBLE and the easy-to-awaken but
safer TASK_INTERRUPTIBLE. TASK_KILLABLE is the outcome of an issue raised in
2002 about the OpenAFS file system driver waiting for an event interruptibly
after blocking all signals. This new sleeping state echoes
TASK_UNINTERRUPTIBLE with the ability to respond to fatal signals. In this
article, the author sheds light on this area and, using examples from 2.6.26
and an earlier version, 2.6.18, discusses the related changes to the Linux
kernel and the new APIs that resulted from these changes.
Source: developerWorks : Linux : Technical library Inotify is a Linux feature that monitors file system operations, such as
read, write, and create. Inotify is reactive, surprisingly simple to use, and
far more efficient than, say, busy polling from a cron job. Learn how to
integrate inotify into your own applications, and discover a set of
command-line tools you can use to further automate system administration.
Source: developerWorks : Linux : Technical library Cloud computing and storage convert physical resources (like processors and
storage) into scalable and shareable resources over the Internet (computing and storage
"as a service"). Although not a new concept, virtualization makes this much more scalable
and efficient through the sharing of physical systems through server virtualization. Cloud
computing gives users access to massive computing and storage resources without their
having to know where those resources are or how they're configured. As you might expect,
Linux plays a huge role. Discover cloud computing, and learn why there's a penguin behind
that silver lining.
Source: developerWorks : Linux : Technical library This article explains how you can improve the performance of I/O-intensive Java applications running on Linux and UNIX platforms through a technique called zero copy. Zero copy lets you avoid redundant data copies between intermediate buffers and reduces the number of context switches between user space and kernel space.
Source: developerWorks : Linux : Technical library The Nokia N810 alarm interface allows developers to efficiently and
easily set alarms programmatically. Peter Seebach illustrates how a small
command-line program can hook into this API and make good use of it.
Source: developerWorks : Linux : Technical library In the Common Information Model (CIM), a client application can
subscribe to be notified of CIM events. Normally, an application can create
event filters with multiple event handlers through different connection ports,
but this consumes lots of network resources and adds much complexity when it
comes to maintenance. In this article, see how to register
multiple CIM event handlers with a single specific connection port. Also
pick up some tips on how to write code with the SBLIM CIM client library.
Source: developerWorks : Linux : Technical library Dynamically linked shared libraries are an important aspect of
GNU/Linux. They allow executables to dynamically access external functionality
at run time and thereby reduce their overall memory footprint (by bringing
functionality in when it's needed). This article investigates the process of
creating and using dynamic libraries, provides details on the various tools
for exploring them, and explores how these libraries work under the hood.
Source: developerWorks : Linux : Technical library Web developers are enjoying a renaissance. After spending much of the previous
decade toiling on server-centric code, programmers are now putting code
front-and-center, turning the Web browser into its own computing platform. Much of the
renaissance must be attributed to ingenuity. The newest generation of tools and
application frameworks automate and simplify the drudgery of building, deploying, and
maintaining a Web site. There are also more tools than ever, and all the most
innovative tools are open source. This tutorial provides an expansive survey of the free
software available to developers to create and deploy Web applications.
Source: developerWorks : Linux : Technical library If you've worked on IBM AIX, another flavor of UNIX, or
Linux, you've more than likely used the vi editor. Since its conception in 1976, vi has
become a staple for anyone wanting to edit files. How could someone make a more powerful
editing tool than vi, you may ask? The answer is Vim, and this article provides details on the
many enhancements that have made Vim a highly used and acceptable editor in the world
of UNIX and Linux.
Source: developerWorks : Linux : Technical library Learn how to build a custom Linux distribution to use in an embedded
environment, in this case to drive a Technologic Systems TS-7800 single-board
computer. In this tutorial, you learn about cross-compiling, the boot loader, file systems,
the root file system, disk images, and the boot process, all with respect to
the decisions you make as you're building the system and creating
the distribution.
Source: developerWorks : Linux : Technical library The third and final installment in this series on run-time monitoring of Java
applications focuses on strategies and techniques for monitoring the performance and availability of an application's supporting and dependent services. These include the underlying host operating system, the operational database, and messaging infrastructures. The article concludes with a discussion of performance data management issues and data reporting and visualization.
Source: developerWorks : Linux : Technical library Blades are an excellent choice for many applications and services,
especially in the telecommunications service provider industry. But the unique
requirements of these provider networks often require configurations that are
complex and need up-front focus and planning so all the stringent functional
requirements are met. In this article, learn how to plan and set up the
necessary network configurations for a POWER6 JS22 blade deployment.
Source: developerWorks : Linux : Technical library Organizations today face two major challenges: deployment of an
increasingly rich service mix and managing the associated massive base of computing
platforms. In this article, discover a new(ish) means of viewing a key component of the
organizational architecture--treating operating systems themselves as individual
managed objects.
Source: developerWorks : Linux : Technical library Learn these 10 tricks and you'll be the most powerful Linux systems
administrator in the universe well, maybe not the universe, but you will
need these tips to play in the big leagues. Learn about SSH tunnels, VNC,
password recovery, console spying, and
more. Examples accompany each trick, so you can duplicate them on your
own systems.
Source: developerWorks : Linux : Technical library So you've been the AIX guru on your team for years now and your bosses have
determined that they want to try Linux on System p. You can fight the change, or
you can embrace it and learn Linux, if not learn to love it. The purpose of this
article is to introduce Linux to AIX administrators. It will show you what you
need to know to make the transition to Linux simpler. It will also show you the
equivalent commands to perform specific tasks and also discusses process
management, filesystem management, how to peruse systems information, install packages, and other important bits of information that you as the systems administrator will need to know. While you will not become an expert at Linux from this article, this should give you a good head start in what you need to know.
Source: developerWorks : Linux : Technical library Can Informix Dynamic Server (IDS) run on Linux in Xen hypervisor virtual
machines (VM)? Is all OS-specific functionality of IDS usable in a Xen VM? This
article is a detailed summary of first experiences with running IDS for Linux in a Xen managed virtual machine. In this article, learn more about the benefits of Xen hypervisor and see how it works. Follow step-by-step guidelines to set up an actual test system, including the Xen virtualization layer. Finally, learn about the results of tests that the authors ran on their IDS environments.
Source: developerWorks : Linux : Technical library Linux loadable kernel modules, introduced in version 1.2 of the kernel,
are one of the most important innovations in the Linux kernel. They provide a
kernel that is both scalable and dynamic. Discover the ideas behind loadable
modules, and learn how these independent objects dynamically become part of
the Linux kernel.
Source: developerWorks : Linux : Technical library Today's Web applications provide many
benefits for online storage, access, and collaboration. Although some applications offer
encryption of user data, most do not. This article provides tools and code needed to add
basic encryption support for user data in one of the most popular online calendar
applications. Building on the incredible flexibility of Firefox extensions and the Gnu
Privacy Guard, this article shows you how to store only encrypted event descriptions in
Google's Calendar application, while displaying a plain text version to anyone with the
appropriate decryption keys.
Source: developerWorks : Linux : Technical library In this tutorial, Sean Walberg helps you prepare to take the Linux
Professional Institute Senior Level Linux Professional (LPIC-3) exam. In this third
in a series of six tutorials, Sean walks you through configuring a Lightweight
Directory Access Protocol (LDAP) server, including access control, security, and
performance. By the end of this tutorial, you'll know about LDAP server
configuration.
Source: developerWorks : Open source : Technical library SearchMonkey is one of the first attempts from a major search engine to make
use of Semantic Web technologies to enhance search results. In this tutorial, you
will implement a Yahoo! SearchMonkey application that enhances blogger.com search
listings to include other information about the blog and blog owner. You will
first implement a basic application using the default data available from Yahoo!.
Then you will create a custom data service to provide your own structured data to
SearchMonkey before you develop a more advanced application that takes advantage of this new custom data service.
Source: developerWorks : Open source : Technical library The programming flexibility available for the Cell Broadband Engine(TM) is a
hot topic in the multicore community. This article discusses leveraging your existing
skills to program for Cell/B.E.(TM), offers three programming approaches for Cell/B.E.
systems, and introduces the various tools, software, and hardware available
for the platform.
Source: developerWorks : Web development : Technical library An old Java technology hand and new Enhydra partisan, the author urges developers to consider alternatives to JavaServer Pages (JSP) servlets when choosing an approach to coding Web applications. JSP technology, part of Sun's J2EE platform and programming model, serves as a solution to the common dilemma of how to turn drab content into a visually appealing presentation layer. The fact is, Web developers aren't uniformly happy with JSP technology. Since many variations on the Sun technology are now available, you can choose from a number of presentation technologies. This article takes an in-depth look at JSP coding and explores some attractive alternatives.
Source: developerWorks : Open source : Technical library This article explores the new features of Equinox p2, which debuted in Eclipse
V3.4. It looks at the pitfalls of the update manager user interface (UI) that was
available in earlier versions of Eclipse and shows how the Equinox p2 framework is an
improvement. Specifically, it shows how to use the new features in the Equinox p2
framework to install Eclipse and its plug-ins.
Source: developerWorks : Open source : Technical library Learn how to use JavaScript and the Imager Perl module to interface with a Firefox extension for rotating image tiles in Google Maps.
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