communication and software engineering software scalability is the ability of a system, network ... to accommodate that growth. ref Andr B. Bondi, Characteristics of scalability and their impact on performance ... scalability of a company implies that the underlying business model offers the potential for economic growth within the company. Scalability, as a property of systems, is generally difficult to define ref See for instance, Mark D. Hill, What is scalability? in ACM SIGARCH Computer Architecture ... systems scalability in Proceeding of the 28th international conference on Software engineering ICSE ... to define the specific requirements for scalability on those dimensions that are deemed important. It is a highly .... The concept of scalability is desirable in technology as well as business settings. The base concept ... will decline variable costs will increase and reduce contribution margin . Measures Scalability can be measured in various dimensions, such as Administrative scalability The ability for an increasing number of organizations or users to easily share a single distributed system. Functional scalability ... scalability The ability to maintain performance, usefulness, or usability regardless of expansion from concentration in a local area to a more distributed geographic pattern. Load scalability The ability ..., regardless of the model. Database scalability A number of different approaches enable database s to grow ... model to achieve scalability, based on a shared everything architecture that relies upon high ... to achieve the highest performance and scalability. ref GigaSpaces. http www.gigaspaces.com ... 23, 2007. ref On the other hand, Base One makes the case for extreme scalability without departing from mainstream database technology. ref Base One. http www.boic.com scalability.htm Database Scalability ..., 2007. ref In either case, there appears to be no limit in sight to database scalability. Design for scalability It is often advised to focus system design on hardware scalability rather than on capacity ... more details
Portal Software Testing Scalability Testing , part of the battery of non functional tests , is the testing of a software application for measuring its capability to Scalability scale up or scale out ref http msdn2.microsoft.com en us library aa292172 VS.71 .aspx Scalability Bot generated title ref in terms of any of its non functional capability be it the user load supported, the number of transactions, the data volume etc. Performance analysis Performance , scalability and Reliability engineering reliability are usually considered together by software quality analysts. Tools Scalability testing tools exist often times leveraging scalable resources themselves in order to test load, concurrent connections, transactions, and throughput of many internet services. Of the available testing services, those offering API support suggest that environment of continuous deployment also continuously test how recent changes may impact scalability. br Commonly used tools include SOASTA https www.cloudassault.com Cloud Assault References Reflist Refbegin Refend Further reading http msdn2.microsoft.com en us library aa292172 VS.71 .aspx Designing Distributed Applications with Visual Studio .NET Scalability Category Software testing Software stub ... more details
Unreferenced date December 2009 Non functional testing is the testing of a software application for its non functional requirement s. The names of many non functional tests are often used interchangeably because of the overlap in scope between various non functional requirements. For example, Performance engineering software performance is a broad term that includes many specific requirements like Reliability engineering reliability and scalability . Non functional testing includes Baseline testing Compatibility testing Compliance testing Documentation testing Endurance testing Load testing Localization testing and Internationalization testing Software performance testing Performance testing Recovery testing Resilience testing Security testing Scalability testing Stress testing Usability testing Volume testing See also Portal Software Testing Functional testing DEFAULTSORT Non Functional Testing Category Software testing ... more details
Scale up , Scale up , or scaleup may refer to Scalability , the ability to function with different amounts of required work, or to be readily adjusted to do so Scale up chemical engineering in chemical engineering, the migration of a process from the lab scale to the pilot plant scale or commercial scale See also Wiktionary SCALE UP , a type classroom layout and learning environment disambig ... more details
no footnotes date January 2012 An Agile Application is the result of Service oriented architecture Service Oriented Architecture and Agile software development Agile Development paradigms. An Agile Application is distinguished from average applications in that it is a Loose coupling loosely coupled set of services with a decoupled Orchestration computers orchestration layer and it is easily modified to address changing business needs and it is scalable by design. Using Agile software development Agile Applications development paradigms , a set of services can be built to address business specific functional components. These services can be exposed using any one of the standard communication protocols including web services. A well designed Agile Application will standardize on a common communication protocol and a common data model. The services can then be orchestrated using a decoupled layer to implement business logic. There are many tools by different vendors in the industry that can support the orchestration layer Citation needed date June 2011 . The decoupled nature of an Agile Application permits it to accommodate fault tolerance and scalability . For example, scalability is addressed through focusing the attention of the Quality assurance QA team in the set of services that are causing the bottleneck as opposed to trying to solve scalability for the entire system which can be a much bigger problem. Similarly, fault tolerance can be achieved through deploying multiple instances of a service. If one service fails, another instance can pick up the load. For stateless services, this can lead to continuous availability. Following the Agile Development paradigm, each unit of development cycle can be focused on a single service. Furthermore, multiple of these development cycles can run in parallel leading to faster development completion. Agile is a means of responsiveness based on customization rather than stable production or standardization. References http www ... more details
scalability issues. Carnegie Mellon wanted to move to a standards compliant mail system that met or exceeded the feature set of AMS, and with an emphasis on disconnected operation and scalabilityscalability ..., it became clear that users required further scalability and additional reliability beyond that which ... more details
An in kernel web server is an unlimited HTTP server that runs in kernel space or equivalent. Also called accelerator . Benefits Performance. The path taken by data from disk to network. Proper asynchronous zero copy interfaces would make this available from user space. Scalability with respect to number of simultaneous clients. Event notification of comparable scalability seems unlikely in user space ref 1 1 . Drawbacks Security Kernel processes run with unlimited privileges. Portability. Every kernel needs a specific implementation route. Reliability. Failure in the webserver may crash the OS. Implementations Solaris Operating System Solaris NCAkmod HP UX NSAhttp Linux khttpd Linux TUX web server TUX Windows NT http.sys part of Internet Information Services IIS SPIN operating system SPIN SPINhttp http OpenVMS WASD.trap See also Comparison of web server software References note 1 1 http www.citi.umich.edu techreports reports citi tr 00 4.pdf CITI TR 00 4 http usenix.org events usenix01 full papers joubert joubert.pdf High Performance Memory Based Web Servers Kernel and User Space Performance. Philippe Joubert, Robert B. King, Rich Neves, Mark Russinovich, John M. Tracey. IBM. T. J. Watson Research Center Category Web server software ... more details
A point of delivery , or POD , is a module of network, compute, storage, and application components that work together to deliver networking services. The POD is a repeatable pattern, and its components maximize the modularity, scalability, and manageability of data centers. ref http www.cisco.com en US prod collateral switches ps9441 ps10110 data sheet c78 507093.html wp9000106 ref The concept of a design pattern is nothing new in computer or network architecture. In particular, the modular design principle has long been applied to telephone and data networks, for instance through a repeatable Node networking node design describing the configuration of equipment housed in point of presence facilities. The term is similarly used in cable video networks ref http www.cablelabs.com news pr 2000 2000 01 18.html ref , to describe the modular component that delivers video service to a subscriber. The distinction of a POD versus other design pattern s is that it is a System deployment deployable module which delivers a Service economics service . The POD design pattern is especially important in service provider infrastructure , for instance in Data center datacenters supporting cloud computing Service economics services , in order to sustain scalability as usage grows. References Reflist Compu stub Compu network stub Tech stub Category Network architecture Category Software design patterns Category Systems engineering ... more details
Orphan date February 2009 Type of Transmission Control Protocol which is designed to provide much higher throughput and scalability. External links http www.deneholme.net tom scalable Scalable TCP details http datatag.web.cern.ch datatag papers pfldnet2003 ctk.pdf CERN Paper about Scalable TCP http www.csm.ornl.gov dunigan net100 kelly.html Oak Ridge National Laboratory Protocol Speed Tests See also UDP based Data Transfer Protocol Compu sci stub Category Internet protocols Category TCP IP Category Transport layer protocols ... more details
Unreferenced date March 2007 Portal Software Testing Modularity driven testing is a term used in the testing of software . Test Script Modularity Framework The test script modularity framework requires the creation of small, independent scripts that represent modules, sections, and functions of the application under test. These small scripts are then used in a hierarchical fashion to construct larger tests, realizing a particular test case. Of all the frameworks, this one should be the simplest to grasp and master. It is a well known programming strategy to build an abstraction layer in front of a component to hide the component from the rest of the application. This insulates the application from modifications in the component and provides modularity in the application design. The test script modularity framework applies this principle of abstraction or encapsulation in order to improve the maintainability and scalability of automated test suites. DEFAULTSORT Modularity Driven Testing Category Software testing ... more details
unreferenced date October 2011 Image Exponential.png thumb 300px right The graph illustrates how an exponential growth surpasses both linear and cubic growths. Notice how quickly and substantially an error can be compounded over time. Exponential error is an idea expressing how a very small error can compound itself over time. It can be characterized as the exponential growth of an error or the application of exponential growth in terms of an error. See also Exponential growth Computational complexity theory Scalability of algorithms Theory of computation Computer science Analysis of algorithms Math stub Category Exponentials ar ... more details
Question Manager also called QM is a system that allows institutional staff to manage questions from clients . QM is not intended to be a complex system, and therefore has a workflow that entails clients coming to the institution with a question, and then the question being offered to experts to give answers. The answers are eventually packaged into a concise of question answer pair that is made available to the client, and then for Google to archive. QM is currently being used by national libraries, due to its scalability. Institutions can choose to operate alone, on a single installation, or be part of a large group of institutions that operate together as a whole. Category Knowledge management Category Knowledge Category Information systems Category Groupware ... more details
s scalability issues, a partitioning scheme, named VLAN, was introduced. VLAN 802.1Q A virtual LAN .... Q in Q 802.1ad A number of solutions have been proposed to increase VLAN s scalability. A first proposal ... in Q also introduces a scalability issue within the core of the carrier network, where every core ... Provider MAC header. MAC in MAC technology overcomes the inherent scalability limitations ..., alleviating Q in Q s issue of forwarding table scalability. The same feature assigning a MAC address per edge device, not per service creates a scalability issue for multipoint services. Multipoint ... of VLAN networking, while at the same time solving its addressing space scalability issues described ... using HVID only. Summarization of HVIDs reduces the size of forwarding tables and creates scalability ... more details
, there are other important properties of image compression schemes Scalability generally refers ... compression . Other names for scalability are progressive coding or embedded bitstreams . Despite its contrary nature, scalability also may be found in lossless codecs, usually in form of coarse to fine pixel scans. Scalability is especially useful for previewing images while downloading them e.g. ... of scalability Quality progressive or layer progressive The bitstream successively refines the reconstructed ... others. This may be combined with scalability encode these parts first, others later . Meta information ... more details
orphan date December 2008 In computing , an Ajax Service Bus ASB refers to a software architecture construct, that describes a communication mechanism from the web browser browser to the Server computing Server . The ASB is built for the reliable, secure and scalable needs of global networked enterprises allowing business applications to run in the web browser browser . The ASB manages the application s network communication and provides a channel for optimizing the application web messaging needs. Current Ajax programming Ajax applications rely on the browser s asynchronous communication capabilities called the XMLHttpRequest XHR . An ASB sits on top of the XHR and provides sophisticated performance and reliability features such as two way multiplexing, once and only once guaranteed delivery, publish subscribe exchanges and asynchronous push events. Characteristics As an Enterprise service bus ESB is a horizontal communication connecting into all of the backend Service oriented architecture services the ASB is perpendicular and connects directly into an ESB or into services and is able to extend the communication with those services all the way to the browser where the AJAX application resides. The main difference is that an ESB runs in the datacenter and an ASB runs between the browser and the datacenter. In fact, an ASB may actually plug into an ESB and extends it to the application. Key benefits Creates a first class citizen between the browser and the server Supports reliability, security and scalability from the browser to the server. Better manages higher server levels of systemic quality such as performance, manageability, scalability, and reliability. Optimizes the network connection between the AJAX application client and the backend data servers. References Unreferenced date November 2006 Category Software architecture ... more details
from. The following modalities are possible Temporal frame rate scalability the motion compensation ... from the bitstream. Temporal scalability is already enabled by H.264 MPEG 4 AVC. SVC has only provided supplemental enhancement information to improve its usage. Spatial picture size scalability ... the higher resolutions. SNR Quality Fidelity scalability video is coded at a single spatial resolution .... Combined scalability a combination of the 3 scalability modalities described above. SVC enables forward ... allowed. All scalability tools are allowed as in Scalable High profile but only IDR pictures are permitted ... modulation JPEG 2000 Scalability External links Introduction and overview http ip.hhi.de ... more details
unreferenced date April 2009 IP load testers are a class of protocol analyzer s focused on the practical evaluation of Router computing router performance. Router performance is usually broken down into two categories forwarding plane forwarding performance or data plane , and Routing Information Protocol routing performance or control plane . In practice, the two functions are often evaluated simultaneously. To test forwarding performance, IP load testers typically surround a router with simulated Internet traffic . This function is called Network packet packet blasting , and there are a couple of popular methods. The first method approximates real Internet traffic by using a representative mix of packet lengths, usually referred to as IMIX . Another popular technique is to blast the router with the shortest packet lengths possible, in order to stress the computational performance of the router. In both cases, the IP load tester measures the performance of the router in terms of packet loss loss , Latency engineering latency and throughput . To test the control plane IP load testers typically emulate various Communications protocol protocols via the test ports in order to connect to the real implementations of those protocols on the router itself. For example, within the core of the Internet, various routing protocols are used for the control plane, or routing function of routers. Core routing protocols include BGP , IS IS , OSPF , and Routing Information Protocol RIP . Control plane performance is usually characterized by measurements of scalability and performance. Scalability typically means how many protocol sessions can be handled by the router at one time, and ultimately is a stress of memory. Performance usually refers to a time varying parameter, such as session computer science sessions per second, and ultimately is a stress of CPU power. Comp hardware stub DEFAULTSORT Ip Load Tester Category Electronic test equipment ... more details
merge to Big data discuss Talk Big data analytics date April 2012 The advent of big data has necessitated new tools and techniques for analytics analysis . Big data analytics serves the needs of business intelligence , and presents unique challenges Massive volume data ingest requires tools to ingest huge volumes of data, flexibly, scalability scalably , and in real time computing real time The constant stream of new data requires that data processing occur simultaneously with database query query processing The constantly changing rate of data acquisition requires scalability the ability to keep pace with the volume, speed or flexible processing requirements of the enterprise ideally leveraging existing infrastructure and applications with minimal or no rewrite The need to address these challenges is driven by several factors ref cite web url http www.eweek.com c a Cloud Computing IBM Predictive Analytics How It Helps Tame Big Data 233355 ?kc EWKNLNAV04182012STR1 publisher eWeek title Cloud Computing IBM Predictive Analytics How It Helps Tame Big Data first Darryl K. last Taft date 15 April 2012 ref 1 in 3 business leaders make critical decisions without the information they need 53 of business leaders don t have access to information from across their organization required to do their jobs Organizations applying analytics to data for competitive advantage are 2.2 times more likely to substantially outperform their industry peers Organizations adept at analytics enjoy 1.6 times more revenue growth, 2.0 times more profit growth, and 2.5 times more stock price appreciation than their peers 165 billion in total sales are missed each year because retailers don t have the right products in stock to meet customer demand References reflist External links http www.mckinsey.com Features Big Data Big data The next frontier for competition , McKinsey & Company Category Data management ... more details
Unreferenced date December 2009 Sistina Software was an organization that focused on storage solutions designed around a Linux platform. It was acquired by Red Hat in December, 2003. Their two primary offerings were Global File System GFS and logical volume management LVM . GFS GFS is a cluster file system on Linux that allows servers to transparently access a single file system on a storage area network SAN . Its highlights are performance and reliability journaling filesystem , scalability through parallelism , etc. . LVM LVM has become a part of the Linux kernel . It is a subsystem which allows arbitrary physical storage to be recognized as a virtual disk device. The physical storage can be remote, or it can even consist of multiple physical devices, but LVM abstracts those distinctions away from the operating system user. LVM also provides services for backing up data. Category Red Hat ... more details
wiktionarypar scaling Scaling may refer to Scaling geometry , a linear transformation that enlarges or diminishes objects Reduced scales of semiconductor device fabrication processes the ability of a technology to scale to a smaller process Scalability , a computer s or network s ability to function as the number of users increases. Scaling, North Yorkshire , England Scaling law , a law that describes the scale invariance found in many natural phenomena Image scaling , the resizing of an image The scaling of critical exponents in physics, such as Widom scaling , or scaling of the renormalization group Scale invariance Fouling , i.e., formation of a deposit layer scale on a solid surface, e.g., in a boiler in particular, a kind of micro fouling as crystallization of salts Scaling and root planing , in dentistry, the removal of plaque, calculus, and stains 2.5D Scaling along the Z axis Scaling along the Z axis , a technique used in computer graphics for a pseudo 3D effect. Card throwing , known in magic circles as scaling. Scaling may also be used for Climbing Multidimensional scaling Scale disambig de Skalierung ... more details
Network theory is an area of applied mathematics . This page is a list of network theory topics . See also List of graph theory topics . Network theorems Max flow min cut theorem Menger s theorem Metcalfe s law Network properties Betweenness Centrality Closeness graph theory Closeness Network theory applications Bose Einstein condensation a network theory approach Networks with certain properties Complex network Scale free network Small world network Small world phenomenon Other terms Bottleneck Liquid schedule Network automaton Network effect Network flow Pathfinder network Scalability Sorting network Space syntax Spanning tree protocol Strategyproof Structural cohesion Vickrey&ndash Clarke&ndash Groves Tree and hypertree networks Examples of networks Social network Value network Telecommunications network Electrical network Computer network Project network Workflow Bayesian network Petri net Semantic network Ecological network Chemical Reaction Networks Gene regulatory network Spin network Neural network Category Network theory Category Outlines ... more details
Unreferenced date December 2009 The Survivable Radio Network SURAN project was sponsored by DARPA in the 1980s to develop a set of mobile ad hoc network MANET radio routers, then known as packet radios . The program began in 1983 with the following goals develop a small, low cost, low power radio that would support more sophisticated packet radio protocols than the DARPA Packet Radio project from the 1970s develop and demonstrate algorithms that could scale to tens of thousands of nodes develop and demonstrate techniques for robust and survivable packet networking in sophisticated electronic attacks A follow on program in 1987, the Low cost Packet Radio LPR , attempted further innovations in mobile networking protocols, with design goals including scalability based on dynamic clustering management of radio spreading codes for security, and increasing capacity BBN provided the MANET protocols, and Rockwell provided radio hardware. The prototype radios produced in these programs were known as VRC 99 radios, and were used by the Department of Defense throughout the 1990s for experimentation. DEFAULTSORT Suran Category Radio resource management ... more details
notability Products date May 2009 unreferenced date May 2009 mergeTo IBM Tivoli Framework date February 2011 IBM Tivoli NetView is a Monitor Program based on the Simple Network Management Protocol SNMP , and a part of IBM Tivoli Framework Tivoli Modules . The program provides real time monitoring and active testing on servers supported by SNMP. Tivoli NetView discovers TCP IP networks, displays network topologies, correlates and manages events and SNMP traps, monitors network health, and gathers performance data. Tivoli NetView helps management of large networks by providing scalability and flexibility on mission critical environments. Main functions Scalable distributed management solution Identification of network failures Collection building for management of critical business systems Integration with network management products Maintaining of device inventory for asset management Measuring availability and providing fault isolation for problem control and management Reporting on network trends and analysis Category IBM software Tivoli NetView Compu network stub ... more details
orphan date February 2009 Wikify date April 2010 UETS EFR Universal Ethernet Telecommunications Service Ethernet Fabric Routing is an architecture model conceived by the company L&M as a new Ethernet based switching architecture capable of performances up to one Terabit per second. It is based on hardware switching of Ethernet frames using topological and hierarchically assigned standard local MAC addresses. The architecture solves Ethernet s scalability and security problems, has low cost performance ratios and is compatible with existing Ethernet and IP networks, providing a non disruptive migration path to high performance networks and overcoming TCP IP performance limitations. Currently, this model is in a conception phase and there are a number of papers proposing it from L&M. External links http www.lmdata.es uets.htm Link to the UETS page of L&M in english and spanish Category Networking standards Category Ethernet ... more details
Mergeto transaction processing discuss Talk transaction processing Merge Extreme Transaction Processing date January 2010 Extreme transaction processing XTP is an exceptionally demanding form of transaction processing . Transactions of 10,000 concurrent accesses 500 transaction per second or more would require this form of processing. Citation needed date January 2010 Description XTP applications are designed, developed, deployed, managed, and maintained on computer clusters and or distributed grid computing networks. As a result, XTP applications feature vast improvements in performance scalability availability security manageability dependability These applications generate orders of magnitude more transactions than those created by traditional transaction processing system s because of their wider often multi enterprise, national and global reach. Methodology Empty section date July 2010 See also Computer cluster Complex event processing Distributed computing Distributed transaction processing Grid computing Java EE .NET Framework Transaction processing Transaction Processing Performance Council Category Transaction processing ru ... more details
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