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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 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 : Linux : Technical library The Open Virtualization Format (OVF) is an open standard for packaging
and distributing virtual appliances (or software) that is to be run in virtual
machines. The standard describes an "open, secure, portable, efficient and
extensible format for the packaging and distribution of software to be run in
virtual machines"; the standard is designed so that it is not tied to any
particular hypervisor or processor architecture. In this article, the authors
describe the OVF standard and the OVF Toolkit developed by IBM.
Source: developerWorks : Linux : Technical library In many parts of the world, the power grid is shoddy, computers are
scarce, and connectivity is even rarer. Thus, as with many other modern
practices and technologies, populations are increasingly split into the
"computing haves" and the "computing have-nots." But many are addressing the
divide. SolarNetOne is a turnkey Internet hotspot -- power, computers, and
satellite uplink -- that you can install virtually anywhere, for less
than the cost of a subcompact car.
Source: developerWorks : Linux : Technical library This five-part series walks you through building a simple photo-sharing
Web site using Perl and Apache to access Amazon's Simple Storage Service (S3)
and SimpleDB. In this final installment, examine the full mod_perl site's
templates, including one for indexing, three for uploading (general, S3 forms,
and URL additions), one for image and comment browsing, and one to browse
comments recursively for an image (or threading down).
Source: developerWorks : Linux : Technical library KDE 4 includes many exciting new technologies, including Plasma, a
feature that forms the desktop shell of KDE 4. See how to write simple
Plasma applets (known as "plasmoids") to greatly improve the
desktop experience and how to turn a plasmoid into a simple
memory monitor.
Source: developerWorks : Linux : Technical library This five-part series walks you through building a simple photo-sharing
Web site using Perl and Apache to access Amazon's Simple Storage Service (S3)
and SimpleDB. In this installment, examine the full mod_perl site's code base,
including how to configure the top level, what to do with the handlers, and
how to set up external dependencies.
Source: developerWorks : Linux : Technical library This five-part series walks you through building a simple photo-sharing
Web site using Perl and Apache to access Amazon's Simple Storage Service (S3)
and SimpleDB. In this installment, follow your site's interaction with
SimpleDB by learning how the URL creates a SimpleDB record for the uploaded
file. Also learn how to create, edit, and delete comments as SimpleDB records
on a photo for a particular user.
Source: developerWorks : Linux : Technical library The Blue Gene/L supercomputer provides scientists with the cutting-edge
computing power and complex data-visualization tools they need to stay at the
forefront of their disciplines. Learn how this technology lets computational
molecular biologists create protein folding and misfolding simulations to
better understand these complex molecules.
Source: developerWorks : Linux : Technical library One of the most important modern innovations of Linux is its
transformation into a hypervisor (or, an operating system for other operating
systems). A number of hypervisor solutions have appeared that use Linux as the
core. This article explores the ideas behind the hypervisor and two particular
hypervisors that use Linux as the platform (KVM and Lguest).
Source: developerWorks : Linux : Technical library Green IT is one of the hottest of today's technology trends, and the
GNU/Linux community has risen to the challenge. Along with several corporate
partners, the GNU/Linux operating system provides solutions for dealing with
power consumption, carbon emissions, and e-waste.
Source: developerWorks : Linux : Technical library Many tools are available for programming various versions of ARM cores,
but one particularly popular set is the GNU ARM toolchain. Learn more about
embedded development using the ARM core, as well as how to install the GNU
tools and begin using them.
Source: developerWorks : Open source : Technical library As many architects can attest, there are a lot of scary stories that exist in the pursuit of target solution architectures. Sometimes, these situations occur due to lack of experience, but they also occur as a result of not applying a sound architectural perspective to a given situation. This article looks at a number of actual scenarios and their associated resolutions in the hope of preventing similar misadventures.
Source: developerWorks : Open source : Technical library Applications that depend on near-real-time data -- like stock quotes,
health-monitoring systems, sports updates, news alerts, and more -- are becoming more and more popular and essential. This article describes how you can create such an application using IBM WebSphere Application Server Community Edition and the Web messaging service component of the Feature Pack for Web 2.0. Step through the tasks and issues you might encounter creating a sports community application that reports live score updates, and learn about the low latency server-to-browser event push technique known as Comet.
Source: developerWorks : Open source : Technical library Slice is a module for distributed persistence in OpenJPA. Slice enables
an application developed for a single database to adapt to a distributed,
horizontally partitioned, possibly heterogeneous, database environment. This
all occurs without any change in the original application code or the database
schema. See how to leverage this flexibility for your own applications,
especially those destined for the cloud or Software as a Service.
Source: developerWorks : Open source : Technical library Java virtual machines come with hundreds of command-line options, which more experienced Java developers can use to tune the Java runtime. Learn how to monitor and log compiler performance, disable explicit garbage collection (System.gc();), extend the JRE, and more.
Source: developerWorks : Open source : Technical library The open source Gearman service allows you to easily distribute work to other
machines in your network, either because you want to spread the work over a large body
of machines or because you want to share the functionality of different languages and environments with each other. In this article, you will look at some typical uses of Gearman and how it can solve a variety of issues and problems in modern applications. You will also learn how Gearman can be combined with other tools, like memcached, to help speed up your application and processing requirements.
Source: developerWorks : Open source : Technical library When extended with the downloadable IBM Integration Module,
the IBM Optim pureQuery Runtime simplifies the process of generating
DB2 static SQL for Hibernate and iBATIS applications.
It does this without requiring you to make changes to your application code or
to gather SQL from production workloads.
The Optim pureQuery Runtime also enables Hibernate
and iBATIS applications that access DB2 or Informix to benefit from the heterogeneous
batching feature in pureQuery.
With the heterogeneous batching feature, you can batch multiple INSERT,
UPDATE, and DELETE requests before sending them across the network, even when the requests reference multiple tables.
This article is part one of a two part series.
It describes using the IBM Integration Module with Hibernate applications.
Part two will focus on iBATIS applications.
This article includes
a downloadable sample application that illustrates how you can easily enable both these
capabilities.
The article also provides informal elapsed time performance measurements.
Source: developerWorks : Open source : Technical library The Predictive Model Markup Language (PMML) is the de facto standard
language used to represent predictive analytic models. It allows for predictive
solutions to be easily shared between PMML compliant applications. With predictive
analytics, the Petroleum and Chemical industries create solutions to predict machinery
break-down and ensure safety. PMML is supported by many of the top statistical tools. As a result, the process of putting a predictive
analytics model to work is straightforward since you can build it in one tool and
instantly deploy it in another. In a world in which sensors and data gathering are
becoming more and more pervasive, predictive analytics and standards such as PMML make
it possible for people to benefit from smart solutions that will truly revolutionize
their lives.
Source: developerWorks : Open source : Technical library Learn how to extend the Eclipse Modeling Framework (EMF) Ecore metamodel by
adding elements and attributes to model reusable Java snippets. Also see, step
by step, how to use dynamic templates with JET to generate the implementation code for
the extended model elements.
Source: developerWorks : Linux : Technical library Linux systems are often installed on multiple partitions, each of which
has a fixed size. As your needs change, though, it is often necessary to
resize partitions to suit your changing needs. Several tools exist to do this
in Linux, but there are a number of potential pitfalls and restrictions that
can make the task more difficult than it might at first seem. This article
covers advanced partition resizing issues, including using Logical Volume
Management (LVM) features, troubleshooting, and alternatives to partition
resizing. Part 1 of this series covered basic partition resizing.
Source: developerWorks : Open source : Technical library Porting legacy Perl to Python can be a daunting task. In this article,
learn some of the theory behind dealing with legacy code, including what not
to do.
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