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
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
Asynchronous I/O Input and output (I/O) operations on a computer can be extremely slow compared to the processing of data. An I/O device can incorporate mechanical devices that must physically move, such as a hard drive seeking a track to read or write; this is often orders of magnitude slower than the switching of electric current. For example, during a disk operation that takes ten milliseconds to perform, a processor that is clocked at one gigahertz could have performed ten million instruction-processing cycles. A simple approach to I/O would be to start the access and then wait for it to complete. But such an approach (called synchronous I/O or blocking I/O) would block the progress of a program while the communication is in progress, leaving system resources idle. When a program makes many I/O operations, this means that the processor can spend almost all of its time idle waiting for I/O operations to complete. Asynchronous I/O is used to improve throughput, latency, and/or responsiveness.
Meet Node.js | PeepCode Screencasts for Web Developers and Alpha Geeks Preview Download Free Preview NOTE: The code download has been updated for the latest Node 0.6.10 release and NPM 1.1.1. The Web has seen at least four major advancements in browser technology, about once every five years. Node.js makes it easy to write asynchronous, event-driven applications that serve static, dynamic, and persistent data to clients while using a minimum amount of RAM and CPU time. In this 70-minute Node.js tutorial, you’ll learn to install, use, and understand Node by building a real-time geographical tracking system (live demo). You’ll learn to: Install Node.js (including the latest 0.6.10) Create a basic HTTP server Use built-in and third-party code Organize your code into CommonJS modules Understand and catch errors Build dynamic responses at various URL paths Setup a development environment Configure and use a Websocket server library Write a browser client Publish and subscribe to messages between browser and client Includes a typed transcript. Skills