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Source: developerWorks : Linux : Technical library Starting in December 2009, hard disk manufacturers began
introducing disks that use 4096-byte sectors rather than the more common
512-byte sectors. Although this change is masked by firmware that breaks
the 4096-byte physical sectors into 512-byte logical sectors for the
benefit of the operating system, the use of larger physical sectors has implications for
disk layout and system performance. This article examines these
implications, including benchmark tests illustrating the likely real-world
effects on some common Linux file systems. As disks with 4096-byte sectors
become more common throughout 2010 and beyond, strategies for coping with
these new disks will become increasingly important.
Source: developerWorks : Linux : Technical library So you've got to cut costs, but you're not a manager. You're a
software developer, or a power user, or just someone who needs to keep the
bottom line healthy enough to support your salary. These are ideal situations
for introducing open source software solutions into your environment. That
might sound like you'll spend the next three weeks learning to program or
write makefiles, but it's just not so. Read on and see how open source is a
flexible, usable approach to efficiency in your work
environment.
Source: developerWorks : Linux : Technical library The tools used to boot Linux are changing. Specifically, the Grand
Unified Bootloader (GRUB) is now officially in maintenance mode only, and
GRUB's developers have abandoned the original GRUB in favor of an entirely
rewritten package, known as GRUB 2. Discover GRUB 2's new capabilities and how
to use it.
Source: developerWorks : Linux : Technical library Learn how to choose and configure a boot manager for your Linux system.
You can use the material in this article to study for the LPI 101 exam for
Linux system administrator certification, or just to learn for fun.
Source: developerWorks : Linux : Technical library Linux as a hypervisor includes a number of innovations, and one of the more
interesting changes in the 2.6.32 kernel is Kernel Shared Memory (KSM).
KSM allows the hypervisor to increase the number of concurrent virtual machines
by consolidating identical memory pages. Explore the ideas behind KSM (such as storage de-duplication),
its implementation, and how you manage it.
Source: developerWorks : Linux : Technical library Use inotify when you need efficient, fine-grained, asynchronous
monitoring of Linux file system events. Use it for user-space monitoring for
security, performance, or other purposes.
Source: developerWorks : Linux : Technical library The Linux kernel includes a variety of APIs intended to help developers
build simpler and more efficient driver and kernel applications. Two of the
more common APIs that can be used for work deferral are the list management
and timer APIs. Discover these APIs, and learn how to develop kernel
applications with timers and lists.
Source: developerWorks : Linux : Technical library Learn how to determine which shared libraries your Linux executable
programs depend on and how to load them. You can use the material in this
article to study for the LPI 101 exam for Linux system administrator
certification, or just to learn for fun.
Source: developerWorks : Linux : Technical library For high-frequency threaded operations, the Linux kernel provides
tasklets and work queues. Tasklets and work queues implement deferrable
functionality and replace the older bottom-half mechanism for drivers. This
article explores the use of tasklets and work queues in the kernel and shows
you how to build deferrable functions with these APIs.
Source: developerWorks : Linux : Technical library Learn how to design a partition layout for disks on a Linux system. You
can use the material in this article to study for the LPI 101 exam for Linux system
administrator certification, or just to learn for fun.
Source: developerWorks : Linux : Technical library The Linux system call interface permits user-space applications to
invoke functionality in the kernel, but what about invoking user-space
applications from the kernel? Explore the usermode-helper API, and learn how
to invoke user-space applications and manipulate their output.
Source: developerWorks : Linux : Technical library Learn how to use the vi editor, found on almost every UNIX and Linux system.
You
can use the material in this article to study for the LPI 101 exam for Linux system
administrator certification, or just to learn for fun.
Source: developerWorks : Linux : Technical library A dictionary is a container data structure that offers
different optimizations and trade-offs from a list. In particular, in a
dictionary the order of the elements stored is irrelevant and the identity of
each element is explicit. In this fourth article in a
series introducing Vimscript, Damian Conway introduces you to dictionaries, including
an overview of their basic syntax and many functions. He concludes with
several examples that illustrate the use of dictionaries for more efficient
data processing and cleaner code.
Source: developerWorks : Linux : Technical library Linux system calls -- we use them every day. But do you know how a
system call is performed from user-space to the kernel? Explore the Linux
system call interface (SCI), learn how to add new system calls (and
alternatives for doing so), and discover utilities related to the SCI. [This
article has been updated to reflect coding changes for kernels 2.6.18 and
later. -Ed.]
Source: developerWorks : Linux : Technical library Learn about process management on Linux: how to shuffle processes
between foreground and background, find out what's running, kill processes,
and keep processes running after you've left for the day. You can use the material in
this article to study for the LPI 101 exam for Linux system administrator
certification, or just to learn for fun.
Source: developerWorks : Linux : Technical library The Linux kernel supports a variety of virtualization schemes,
and that's likely to grow as virtualization advances and new schemes are
discovered (for example, lguest). But with all
these virtualization schemes running on top of Linux, how do they exploit the
underlying kernel for I/O virtualization? The answer is
virtio, which provides an efficient abstraction for
hypervisors and a common set of I/O virtualization drivers. Discover
virtio, and learn why Linux will soon be the
hypervisor of choice.
Source: developerWorks : Linux : Technical library Vimscript provides excellent support for operating on collections of
data, a cornerstone of programming. In this third
article in the series, learn how to use Vimscript's built-in lists to ease
everyday operations such as reformatting lists, filtering sequences of
filenames, and sorting sets of line numbers. You'll also walk through
examples that demonstrate the power of lists to extend and enhance two common
uses of Vim: creating a user-defined function to align assignment operators,
and improving the built-in text completions mechanism.
Source: developerWorks : Linux : Technical library Learn how Perl programmers can use three of the CPAN S3 modules --
Net::Amazon::S3, Amazon::S3, and SOAP::Amazon::S3 -- to list, create, and
delete "buckets" (S3 data storage); to list, create, retrieve, and delete
items in a bucket; and to get an item's metadata.
Source: developerWorks : Linux : Technical library In three relatively simple steps, you can create a virtual server on the
Linux KVM hypervisor host using full virtualization. The Kernel-based Virtual
Machine (KVM) is free, open source virtualization software for Linux that is
based on hardware virtualization extensions (Intel VT-X and AMD-V) and a
modified version of QEMU.
Source: developerWorks : Linux : Technical library In this first article in a three-part series on the RPM Package Manager, learn how
to use RPM not just to install software and attendant files but to package
almost anything, from system scripts to source code to
documentation. (This series replaces an earlier series on RPM written by Dan
Poirier.)
Source: developerWorks : Linux : Technical library In this second article in a three-part series on the RPM Package Manager,
learn how
how to use RPM to upgrade and uninstall software on your Linux system.
(This series replaces an earlier series on RPM written by Dan
Poirier.)
Source: developerWorks : Linux : Technical library The libvirt library is a Linux API over the virtualization capabilities
of Linux that supports a variety of hypervisors, including Xen and KVM, as
well as QEMU and some virtualization products for other operating systems. This
article explores libvirt, its use, and its architecture.
Source: developerWorks : Linux : Technical library The task scheduler is a key part of any operating system, and Linux
continues to evolve and innovate in this area. In kernel 2.6.23, the
Completely Fair Scheduler (CFS) was introduced. This scheduler, instead of
relying on run queues, uses a red-black tree implementation for task
management. Explore the ideas behind CFS, its implementation, and advantages
over the prior O(1) scheduler.
Source: developerWorks : Linux : Technical library Learn how to access the features of the Twitter API using the CPAN Net::Twitter module. You'll also see some solid business uses for Twitter, including automated posting and analyzing Twitter search results.
Source: developerWorks : Linux : Technical library Not only has virtualization advanced the state of the art in maximizing
server efficiency, it has also opened the door to new technologies that were not possible before. One of these technologies is the virtual appliance, which
fundamentally changes the way software is delivered, configured, and managed.
But the power behind virtual appliances lies in the ability to freely share
them among different hypervisors. Learn the ideas and benefits behind virtual
appliances, and discover a standard solution for virtual appliance
interoperability called the Open Virtualization Format.
Source: developerWorks : Linux : Technical library If you think streams and pipes make a Linux expert sound like a
plumber, here's your chance to learn about them and how to redirect and split
them. You even learn how to turn a stream into command arguments. You can
use this material in this article to study for the LPI 101 exam for
Linux system administrator certification, or just to learn for
fun.
Source: developerWorks : Linux : Technical library Discover the most common errors in UNIX and Linux -- and
how to avoid them.
Source: developerWorks : Linux : Technical library Learn how to install, upgrade and manage packages on your Linux system.
This article focuses on the Red Hat Package Manager (RPM) developed by Red
Hat,
as well as the Yellowdog Updater
Modified (YUM) originally developed to manage
Red Hat Linux systems at Duke University's Physics department. You can use the material in this article to study
for the LPI 101 exam for Linux system administrator certification, or just to
explore the best ways to add new software and keep your system current.
Source: developerWorks : Linux : Technical library Learn how to use regular expressions, and then use them to find things in
files on your filesystem. You can use the material in
this article to study for the LPI 101 exam for Linux system administrator
certification, or just to learn for fun.
Source: developerWorks : Linux : Technical library Learn how to set and change process priorities so that
applications get as much processing time as
they need. You can use this
material in this article to study for the LPI 101 exam for Linux system
administrator certification, or just to learn for fun.
Source: developerWorks : Linux : Technical library Git offers Linux developers a number of advantages over Subversion for
software version control, so developers working collaboratively owe it to
themselves get familiar with the basic concepts behind it. In
this installment, Ted dissects branching and merging in both Git and
Subversion, introduces "git bisect" for bisecting changes, and shows how to
resolve merge conflicts.
Source: developerWorks : Linux : Technical library For collecting data from Web pages, the mechanize library automates
scraping and interaction with Web sites. Mechanize lets you fill in forms and
set and save cookies, and it offers miscellaneous other tools to make a Python
script look like a genuine Web browser to an interactive Web site. A
frequently used companion tool called Beautiful Soup helps a Python program
makes sense of the messy "almost-HTML" that Web sites tend to
contain.
Source: developerWorks : Linux : Technical library Flickr isn't just for photo sharing and social networking; it's a
legitimate business tool. Learn how Perl programmers can use the CPAN Chart
modules to create charts and graphs, and the Flickr::Upload module to upload
the charts to Flickr.
Source: developerWorks : Linux : Technical library Processors have evolved to improve performance for virtualized
environments, but what about I/O aspects? Discover one such I/O performance
enhancement called device (or PCI) passthrough. This innovation improves
performance of PCI devices using hardware support from Intel (VT-d) or AMD
(IOMMU).
Source: developerWorks : Linux : Technical library This three-part series is your starting point for tuning your system for
power efficiency. In Part 3, the author compares the performance of the five
in-kernel governors in both tuned and untuned states to show you how to
optimize a Linux-based System x server.
Source: developerWorks : Linux : Technical library Many companies like IBM, Google, VMWare, and Amazon have provided products and
strategies for Cloud computing. This article shows you how to use Apache Hadoop to
build a MapReduce framework to make a Hadoop Cluster and how to create a sample
MapReduce application which runs on Hadoop. You will also learn how to set up a
time/disk-consuming task on the cloud.
Source: developerWorks : Linux : Technical library You've probably heard that everything in Linux is a file,
so start on the right path with a solid grounding in file and directory
management -- finding, listing, moving, copying, and archiving.
You can use this material in this article to study for the LPI 101
exam for Linux system administrator certification, or just to learn for fun.
Source: developerWorks : Linux : Technical library Electricity is invisible. To understand how people use it, you need to make it visible. This tutorial will show you how easy it is to build a Web-based energy monitoring system yourself, using a Current Cost real-time energy monitor and AMEE, a neutral Web-based API for energy data, combined with some XML, Ruby, Rails, and Ajax.
Source: developerWorks : Linux : Technical library This three-part series is your starting point for tuning your system for
power efficiency. In Part 2, follow a step-by-step guide on the general
settings of the Linux CPUfreq subsystem and get more details on the five
in-kernel governors -- performance, powersave, userspace, ondemand, and
conservative -- and their settings.
Source: developerWorks : Linux : Technical library Booting servers from storage area networks with multiple paths can
provide significant benefits for the complex, modern data center environment
-- benefits such as improving availability and increasing your reach when it
comes to easier management and maintainance and in providing reliability. To
boot your Linux system from a SAN device, you'll need to set up a SAN boot
operating system to your storage with multipath driver support; that's where
this article comes in. The author will walk you through setting up a SAN-boot
Linux system on the IBM System Storage DS8000 with the multipath function
supported by the Device-Mapper MultiPath (DMMP) feature.
Source: developerWorks : Linux : Technical library Outdated computer hardware may be too old to rely on, but it represents
a value to your organization -- whether in an office or at home. Discover how
you can realize that value by repurposing older machines with Linux.
Source: developerWorks : Linux : Technical library Once a faraway problem, an important barrier in disk storage is fast
becoming a reality: the venerable master boot record (MBR) partitioning scheme
can't fully handle disks larger than 2TB. With 1TB-hard disks now common and
2TB-disks becoming available, forward-looking individuals are thinking about
alternatives to the MBR partitioning scheme. The heir apparent is the GUID
Partition Table (GPT). Learn how to make sure your Linux system is fully
prepared for the future of disk storage.
Source: developerWorks : Linux : Technical library This three-part series is your starting point for tuning your system for power
efficiency.
In Part 1, get up to
speed on the components and concepts you need to fine-tune a Linux-based
System x server for power efficiency. Learn how to enable the
Linux CPUfreq subsystem, get instruction on C and P states, and
determine which of the five in-kernel governors you need to boost
power efficiency on your system.
Source: developerWorks : Linux : Technical library Accelerate your porting efforts by following this six-step guide. Learn
the differences between Solaris and Linux on POWER that you commonly encounter
during a port. Get an introduction to the development environment for Linux
running on IBM POWER processor-based systems, and see how Sun's compiler/linker
switches compare with those of GNU GCC and the IBM native compiler. Finally,
learn about tools for performance analysis and software packaging for Linux on
POWER. [This article has been updated to reflect the latest product versions.
-Ed.]
Source: developerWorks : Linux : Technical library Learn about binary compatibility as it relates to the different
operating environments that run on Linux on POWER. Examine the two Linux on
POWER distributions supported by IBM, Red Hat Enterprise Linux (RHEL) and SUSE
LINUX Enterprise Server (SLES), with regard to the binary compatibility
between their respective releases. In general, a smooth transition from the
2.6.9 kernel-based RHEL4 to the 2.6.18 kernel-based RHEL5 is made possible by
the stable Application Binary Interface (ABI) maintained between the releases.
The same can be said when moving from the 2.6.5 kernel-based SLES9 to the
2.6.16 kernel-based SLES10. Learn about new technologies that can provide
performance enhancements for a Linux on POWER application, and follow steps to
ensure binary compatibility across multiple distributions in the future.
[Additional items have been added to the Resources section. -Ed.]
Source: developerWorks : Linux : Technical library Linux is the very definition of flexibility and extensibility. Take the
virtual file system switch (VFS). You can create file systems on a variety of
devices, from traditional disk, USB flash drives, memory, and other storage
devices. You can even embed a file system within the context of another file system.
Discover what makes the VFS so powerful, and learn its major
interfaces and processes.
Source: developerWorks : Linux : Technical library Version control systems are a core component of most development projects,
regardless of whether you're developing an application, a Web site, or an operating
system. Most projects involve multiple developers, often working at widely separated
physical locations. Distributed version control systems are nothing new, but the Git version
control system provides unique support for collaboration and interaction among developers.
Source: developerWorks : Linux : Technical library There's a lot more to text manipulation than cut and paste,
particularly when you aren't using a GUI. Study for the Linux Professional
Institute Certification (LPIC) 101 exam, or learn
for fun. In this article, Ian Shields introduces you to text manipulation on
Linux using filters from the GNU textutils package. By the end of this
article, you will be manipulating text like an expert. [The first line of
Listing 7 has been corrected, thanks to an alert reader. -Ed.}
Source: developerWorks : Linux : Technical library Use this roadmap to find IBM developerWorks articles that will help you
learn and review
basic Linux tasks. And if you're also pursuing professional certification as
a Linux system administrator,
these articles can help you study for the Linux
Professional Institute Certification (LPIC) exam 101 and exam 102.
This roadmap is organized according to the
43 objectives in the 101 and 102 exams, which you are required to pass for
LPI level 1 certification.
Source: developerWorks : Linux : Technical library GUIs are fine, but to unlock the real power of Linux, there's no
substitute for the command line. In this article, Ian Shields introduces
you to some of the major features of the bash shell, with an emphasis on the features that are
important for LPI certification. By the end of this article, you will
be comfortable using basic Linux commands like echo and exit,
setting environment variables, and gathering system information.
[The first two notes following Listing 8 have been updated to correct the process IDs
(PIDs). -Ed.]
Source: developerWorks : Linux : Technical library The Beagle Board is an open-hardware single-board computer that is both
inexpensive and capable of running Linux at a reasonable speed. Get to know
the Beagle Board, and learn how to get a Linux development environment
together on the cheap.
Source: developerWorks : Linux : Technical library The O'Reilly Open Source Convention (OSCON) is nothing if not a place
to collect one's deeper thoughts around software development. The 2009
convention offered more than its share of inspiration, but David Mertz
whittled the schedule down and focused on two very different but important
areas: open government and concurrency.
Source: developerWorks : Linux : Technical library Distributed version control systems (DVCSs) offer a number of advantages
over centralized VCSs, and for Subversion users looking to explore this model,
Git is a great place to start. Using Subversion as a baseline, this first of
two articles shows how to install Git, set up a remote repository, and begin
using basic Git commands.
Source: developerWorks : Linux : Technical library Learn how to use the Linux command line and some basic Bash scripting
techniques to draw lines and text on images using ImageMagick. And create a
pixel ruler along the way.
Source: developerWorks : Linux : Technical library Construct an on-demand software build service using ooRexx that uses the
Linux Kernel Virtual Machine (KVM) for better performance. KVM acts as the
host for the guest operating systems that build the target software for the
user. The Apache Web server controls the builds and stores the results for
later retrieval by the user. Learn how to set up the build server and create
guests, customize build requests, and organize and access build
results.
Source: developerWorks : Linux : Technical library User-defined functions are an essential tool for decomposing an
application into correct and maintainable components, in order to manage the
complexity of real-world programming tasks. This article (the second in a
series) explains how to create and deploy new functions in the Vimscript
language, giving several practical examples of why you might want
to.
Source: developerWorks : Linux : Technical library As a Linux administrator, you may encounter rootfs
errors like"cannot mount rootfs" and "kernel panic" when you try to reboot a server
after attaching volumes from
external storage or even after installing a new Linux operating system.
This article outlines the Linux booting process on an x86 platform, shows why
this problem happens, and offers four tips to avoid it or fix it.
Source: developerWorks : Linux : Technical library Learn how to install, upgrade, and manage packages on your Linux
system.
This article focuses on the Advanced Packaging Tool, or
APT, which is the package management system used by Debian and
distributions derived from Debian, such as Ubuntu. You can use the material in this article to study
for the LPI 101 exam for Linux system administrator certification, or just to
explore the best ways to add new software and keep your system current.
Source: developerWorks : XML : Technical library In this article, we present an approach for XML Validation using OASIS Content
Assembly Mechanism (CAM) templates to support a wide array of complex message
exchanges with business partners using B2B or B2C business patterns. The CAM
templates simplify and externalize the validation rules while allowing the gateway
to act as a pass-through on information that is not directly relevant. We also cover
our experiences using an open source component built using Eclipse and Java
technology to deliver the needed validation services. Follow the application development
process as it happened along with sample code snippets and an XML example using the
STAR (Standards for Technology in Automotive Retail) Automotive Business Object
Document (BOD) schema and associated CAM XML template.
Source: developerWorks : Open source : Technical library The Zend Framework is an MVC-compliant framework for building robust, scalable PHP Web applications. It includes a Zend_Soap component that allows developers to quickly and efficiently add SOAP-based Web services to their applications. This article examines the Zend_Soap component in detail, illustrating how you can build a SOAP Web service and examining features such input validation, fault generation, and WSDL auto-creation.
Source: developerWorks : Open source : Technical library Developing for mobile devices has been a high cost, low return
proposition for many years, despite the hype around it. The latest generation
of smartphones powered by the iPhone OS and Google's Android provide a much
simplified solution: just build Web applications. This gives you a one build for
all devices approach, which can lower the cost. Even better, these high-end devices
all offer ultra-modern browsers supporting advanced HTML, JavaScript, and CSS.
In this article, learn how to build Asynchronous JavaScript and XML (Ajax)-heavy applications that take
full advantage of the capabilities of modern smartphones. You will learn not
only how to get the most out of these devices, but also how to deal with the
subtle differences between them.
Source: developerWorks : Open source : Technical library iBATIS is a project used primarily for data access object (DAO)
and object-relational mapping (ORM). You can use it to easily work with Java
objects and databases. The update for iBATIS 3 beta 9 was posted January 23,
2010. iBATIS 3 is a completely rewritten version of iBATIS and includes some
significant updates. This article introduces some of what's new in iBATIS 3.
Source: developerWorks : Open source : Technical library Lombok is a Java utility that enables developers to eliminate Java
verbosity, specifically with plain old Java objects (POJOs). It does this with
the use of annotations. Developers can save a lot of time constructing methods
such as hashCode() and equals(), as well as the usual assortment of accessors
and mutators, by implementing Lombok in their development environments.
Source: developerWorks : Open source : Technical library The popular jQuery JavaScript library is best known for its use working with
HTML, but you can also use it to process XML, if you're careful and aware of the pitfalls. This article shows how to use jQuery to process the Atom Web feed format. Web feed XML is perhaps the most pervasive XML format around, and the main fulfillment of the promise of XML on the Web. But most such formats use XML namespaces, which cause issues with many popular JavaScript libraries, including jQuery.
Source: developerWorks : Open source : Technical library Google provides an interesting and easy-to-use open source alternative for developing unit tests to validate C/C++ based software. This article introduces readers to some of the more useful features of the Google C++ Testing Framework and is based on version 1.4 of the release.
Source: developerWorks : Web development : Technical library This is the final article in a five-part series written for the PHP developer interested in learning about an open-source, flexible, and scalable framework called Agavi. You'll learn to support file uploads, store user data in sessions, integrate third-party libraries and create custom input validators for your Agavi application.
Source: developerWorks : Web development : Technical library Discover how easy it is to improve the usability of your CodeIgniter applications using jQuery.
By leveraging the power of CodeIgniter's MVC-based framework and jQuery's support for
Asynchronous JavaScript and XML (Ajax) interaction, learn how to quickly and efficiently create more effective UIs.
Source: developerWorks : Open source : Technical library The Apache CXF Web services stack supports JAXB 2.x data binding (along with some alternative data bindings) and JAX-WS 2.x service configuration. Like the Metro JAXB/JAX-WS alternative discussed in earlier columns, CXF uses XML files to extend the JAX-WS configuration information. In this article, Java Web services series author Dennis Sosnoski looks into the basics of working with CXF for client and server development.
Source: developerWorks : Open source : Technical library If you want your teams to collaborate by using IBM Rational Team Concert and Jazz technology, yet you are reluctant to give up the mainframe software configuration management (SCM) system that you use, this article is for you. It explains how you can jump start your development teams on Rational Team Concert while enabling governance of your existing mainframe SCM system.
Source: developerWorks : Open source : Technical library NoSQL datastores like Bigtable and CouchDB are moving from margin to center in the Web 2.0 era because they solve the problem of scalability, and they solve it on a massive scale. Google and Facebook are just two of the big names that have bought in to NoSQL, and we're in early days yet. Schemaless datastores are fundamentally different from traditional relational databases, but leveraging them is easier than you might think, especially if you start with a domain model, rather than a relational one.
Source: developerWorks : Web development : Technical library Plug-ins let third parties, or partners, customize the vCenter
Server with their own Web product-specific menu selections, tabs, or toolbars.
With plug-ins you have a wide range of integration and extension scenarios, such as
navigating the vSphere Client to the HostSystem's power management Web page. In
this article, learn about vCenter Server plug-in architecture and how to add
your own Web extensions to the vSphere Client. Walk through the setup and
configuration, and explore the workflow at run time. Learn to enable or disable a
specific plug-in using the Manager Plug-ins menu in vSphere
Client.
Source: developerWorks : Open source : Technical library One of Linux's strengths is its cross-platform nature: you can run it on
x86, x86-64, SPARC, PowerPC, and many other central processing units (CPUs).
This wealth of hardware choices poses a challenge for software developers,
though. Ensuring that software compiles, and runs correctly, on all platforms
can be difficult. The use of the QEMU package can help ease this burden. QEMU
is a machine emulator that supports a wide range of CPUs, so you can run
PowerPC software on an x86 computer, x86-64 software on an SPARC computer, or
what have you. This facility is particularly useful for programmers who need
to test software's endianness compatibility or check other CPU-specific
features. QEMU also enables you to run different operating systems entirely,
so that you can test a program's ability to compile and run under FreeBSD,
Solaris, or even Microsoft Windows without shutting down Linux.
Source: developerWorks : Open source : Technical library Meet OpenLaszlo, an open source platform, released under the Common
Public License (CPL), for the development and delivery of rich Internet
applications (RIAs). OpenLaszlo is based on LZX, which is an object-oriented
language utilizing XML and JavaScript. Rich-client applications written with
OpenLaszlo run across browsers and across platforms. In this article, we
look at the architecture and APIs of OpenLaszlo with several examples. We
also cover the basic debugging tools.
Source: developerWorks : Open source : Technical library Are you an experienced PHP developer who needs to learn Python? This
article approaches the world of Python development from a PHP developer's
perspective, translating familiar PHP concepts, such as variables, lists, and
functions, into their Python equivalents.
Source: developerWorks : Open source : Technical library Google Base allows users to store any type of content online in Google's
version of a massive online database. Web application developers are able to
access and search this content through the Google Base Data API. This article
introduces the Google Base Data API and demonstrates it in the context of a PHP
application, explaining how to use SimpleXML and the Zend_Gdata module to search, retrieve, add, and edit different types of data on Google Base.
Source: developerWorks : Open source : Technical library As mobile platforms become increasingly sophisticated, the
demand for mobile computing will increase. In this "Introduction
to the eSWT mobile extension series, learn about the embedded Standard Widget Toolkit
(eSWT). You can use eSWT to develop native-looking Java applications for a
variety of mobile phones. In this article, learn how to use more of the mobile
controls: MultiPageDialog, QueryDialog, TimedMessageBox, MobileDevice, Screen,
and Input.
Source: developerWorks : Open source : Technical library Hardware management using the Common Information Model standard often
means that the management application must be capable of listening to and handling
the indications that occur at the hardware level.
To test the indication listener component of the
management application when the planned system hardware is not
available during development, you will need dummy indications.
This article explains how
to generate dummy indications on OpenPegasus CIMOM (Common Information Model
Object Manager) using a provider shipped with the OpenPegasus source
code.
Source: developerWorks : Open source : Technical library Data mining is a collective term for dozens of techniques to glean
information from data and turn it into meaningful trends and rules to improve
your understanding of the data. In this second article of the series, we'll
discuss two common data mining methods -- classification and clustering -- which
can be used to do more powerful analysis on your data.
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