Go vs D vs Erlang vs C in real life: MQTT broker implementation shootout. At work we recently started using the MQTT protocol, which uses a publish / subscribe model. It’s simple in the good way and well thought out. We went with an open source implementation named Mosquitto. Cloud computing Cloud computing metaphor: For a user, the network elements representing the provider-rendered services are invisible, as if obscured by a cloud. Cloud computing is a computing term or metaphor that evolved in the late 1990s, based on utility and consumption of computer resources. Cloud computing involves application systems which are executed within the cloud and operated through internet enabled devices. Purely cloud computing does not rely on the use of cloud storage as it will be removed upon users download action. Clouds can be classified as public, private and hybrid.[1][2]
Distributed computing "Distributed Information Processing" redirects here. For the computer company, see DIP Research. Distributed computing is a field of computer science that studies distributed systems. A distributed system is a software system in which components located on networked computers communicate and coordinate their actions by passing messages.[1] The components interact with each other in order to achieve a common goal. Three significant characteristics of distributed systems are: concurrency of components, lack of a global clock, and independent failure of components.[1] Examples of distributed systems vary from SOA-based systems to massively multiplayer online games to peer-to-peer applications.
Taking an MQTT server out for a few holes on the code golf course ¶ jra's thoughts A while ago at work, I needed to learn a little about MQTT. After reading the spec and finding this package that handles reading and writing the messages themselves, I decided to write a server. The result is here: After I finished, I wanted to know if my server was comparable to Mosquitto, so I wrote some load testing tools. I found that my Go server was generally comparable to Mosquitto, in that it had the same order of magnitude for transaction rate and latency (but it was strictly slower than Mosquitto; there is a cost to pay for the benefits Go gives you). As usual, Go programs compare quite favorably to C programs in terms of memory safety, overall length, and readability.
Cloud.com CEO Sheng Liang Discusses Open-Source Cloud Computing & Asia Cloud.com CEO Sheng Liang was the lead developer on Sun Microsystems' original Java Virtual Machine (JVM) team. Today he is a co-founder and CEO of Cloud.com, based in Cupertino, CA. The company delivers an open-source platform for both Public and Private Clouds, and will be discussing all this at the upcoming Cloud Expo In New York June 6-9. Cloud.com also has a significant focus on Asia. Here are a few things we discussed in a recent interview... 1.
Difference Between Grid Computing and Distributed Computing Definition of Distributed Computing Distributed Computing is an environment in which a group of independent and geographically dispersed computer systems take part to solve a complex problem, each by solving a part of solution and then combining the result from all computers. These systems are loosely coupled systems coordinately working for a common goal. It can be defined as
RabbitMQ MQTT Adapter This is a protocol adapter that allows MQTT-capable clients to connect to a RabbitMQ broker. The adapter translates MQTT 3.1 methods into their AMQP equivalents and back. Announcements regarding the adapter are periodically made on the RabbitMQ mailing list and blog. Supported MQTT 3.1 features QoS0 and QoS1 publish & consumeLast Will and Testament (LWT)SSLSession stickiness Table - Java CoG Kit This page contains download information about the Java CoG Kit. We strongly recommend that you inspect the Instalation Guide. The full binary distribution of the Java CoG Kit including JGlobus can be downloaded from [tar.gz] [zip]. Details on the 4.1.5 release are available on the 4.1.5 Release page Additional information can be found if you follow to the Documentation page. Developers may be interested to directly work with the the newest source code from the SVN and compile the Binary themselves.
mosquitto_pub - an mqtt version 3.1 client for publishing simple raring (1) mosquitto_pub.1.gz Provided by: mosquitto-clients_0.15-0ubuntu2_i386 mosquitto_pub - an mqtt version 3.1 client for publishing simple messages mosquitto_pub [-d] [-h hostname] [-i client_id] [-I client id prefix] [-p port number] [-q message QoS] [--quiet] [-r] { -f file | -l | -m message | -n | -s} [ -u username [-P password] ] [ --will-topic topic [--will-payload payload] [--will-qos qos] [--will-retain] ] -t message-topic mosquitto_pub is a simple mqtt version 3.1 client that will publish a single message on a topic and exit. -d, --debug Enable debug messages. -f, --file Send the contents of a file as the message.
Grid computing The use of widely distributed computer resources to reach a common goal Grids are a form of distributed computing whereby a "super virtual computer" is composed of many networked loosely coupled computers acting together to perform large tasks. For certain applications, distributed or grid computing can be seen as a special type of parallel computing that relies on complete computers (with onboard CPUs, storage, power supplies, network interfaces, etc.) connected to a computer network (private or public) by a conventional network interface, such as Ethernet. This is in contrast to the traditional notion of a supercomputer, which has many processors connected by a local high-speed computer bus.
A Simple Example (Arduino, MQTT, m2m.io) This post shows a quick example of using MQTT and the m2m.io platform with an Arduino device. We will walk through the platform end to end starting with setting up the Arduino to capture sensor data and ending with a super simple Play! app which shows the past sensor readings by consuming the data presented by the m2m.io platform API. Multicast In computer networking, multicast is the delivery of a message or information to a group of destination computers simultaneously in a single transmission from the source. Copies are automatically created in other network elements, such as routers, but only when the topology of the network requires it. At the Data Link Layer, multicast describes one-to-many distribution such as Ethernet multicast addressing, Asynchronous Transfer Mode (ATM) point-to-multipoint virtual circuits (P2MP) or Infiniband multicast. IP multicast[edit] IP multicast is a technique for one-to-many communication over an IP infrastructure in a network.
Using Sockets Sockets and WebSockets provide full-duplex communications channels over a single TCP connection. It is recommended that you secure socket connections with TLS / SSL. The Xively Socket Server is designed to make it easier to interact with Xively in ‘chatty’ situations where HTTP/HTTPS communications would be too onerous – watching for a change to a parameter, or reading/writing frequently for example. The Socket Server includes specific methods to make clients which require real-time ‘push’ notifications as easy as possible. Because it requires only a single connection to be established, it is also a good way to write clients which have more restricted network capabilities. Note: Your client might occasionally be disconnected (due to network instability for instance), so for the best results, your client should be able to automatically reconnect.