Data Plane Development Kit The Data Plane Development Kit (DPDK) is a set of data plane libraries and network interface controller drivers for fast packet processing. The DPDK provides a programming framework for Intel x86 processors and enables faster development of high speed data packet networking applications. It scales from Intel Atom processors to Intel Xeon processors and support for other processor architectures like IBM POWER8 are under progress. It is provided and supported under the open source BSD license. Overview The DPDK framework creates a set of libraries for specific hardware/software environments through the creation of an Environment Abstraction Layer (EAL). The EAL hides the environmental specific and provides a standard programming interface to libraries, available hardware accelerators and other hardware and operating system (Linux, FreeBSD) elements. Libraries The DPDK includes data plane libraries and optimized NIC drivers for the following: Plugins
Event-driven programming Event handlers A trivial event handler Because the code for checking for events and the main loop do not depend on the application, many programming frameworks take care of their implementation and expect the user to provide only the code for the event handlers. In this simple example there may be a call to an event handler called OnKeyEnter() that includes an argument with a string of characters, corresponding to what the user typed before hitting the ENTER key. To add two numbers, storage outside the event handler must be used. The implementation might look like below. globally declare the counter K and the integer T. While keeping track of history is straightforward in a batch program, it requires special attention and planning in an event-driven program. Exception handlers Creating event handlers The second step is to bind event handlers to events so that the correct function is called when the event takes place. Common uses Criticism See also
Introducing Linked Data And The Semantic Web Next: Introducing Graph Data What is Linked Data and the Semantic Web and what is all the hype about? Principally, the Semantic Web is a Web 3.0 web technology - a way of linking data between systems or entities that allows for rich, self-describing interrelations of data available across the globe on the web. In essence, it marks a shift in thinking from publishing data in human readable HTML documents to machine readable documents. How Does It Differ From The Web As It Is Today? Today, much of the data we get from the web is delivered to us in the form of web pages - HTML documents that are linked to each other through the use of hyperlinks. Enter Linked Data - Liberating Web Databases From Their Old Chains The web contains lots of information, but typically the raw data itself isn't available - rather only HTML documents constructed from data, if a web site is generated from a database at all. But Where Do I Start? It needn't be complicated.
Ruby (programming language) Following the release of Ruby 0.95 in 1995, several stable versions of Ruby were released in the following years: Ruby 2.0 added several new features, including: It has been obsolete since February 22, 2016  and it will no longer receive bug and security fixes. Users are advised to upgrade to a more recent version. Semantic versioning also provides additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR.PATCH format, not available at Ruby. PowerPC64 performance Ruby 2.3.0 was released on December 25, 2015. Often people, especially computer engineers, focus on the machines. Python's property descriptors are similar, but come with a tradeoff in the development process. (In Ruby, integer literals are objects that can have methods apply to them, so requiring a digit after a decimal point helps to clarify whether 1.e5 should be parsed analogously to 1.to_f or as the exponential-format floating literal 1.0e5. Classic Hello world example: Input:
Open vSwitch Open vSwitch, sometimes abbreviated to OVS, is a production-quality open-source implementation of a distributed virtual multilayer switch. The main purpose of Open vSwitch is to provide a switching stack for hardware virtualization environments, while supporting multiple protocols and standards used in computer networks. Project's source code is distributed under the terms of the Apache License 2.0. Overview Open vSwitch as a cross-server virtual network switch, transparently distributed across multiple physical servers. As a software implementation of a virtual multilayer network switch, Open vSwitch is designed to enable effective network automation through programmatic extensions, while supporting standard management interfaces and protocols, including NetFlow, sFlow, SPAN, RSPAN, CLI, LACP and 802.1ag. Features As of November 2014[update], features provided by Open vSwitch include the following: See also References External links