In telecommunications and software engineering , scalability is the ability of a system, network, or process ... that growth. ref Andr B. Bondi, Characteristics of scalability and their impact on performance .... An analogous meaning is implied when the word is used in a commerce commercial context, where scalability ... 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 News, December ... scalability in Proceeding of the 28th international conference on Software engineering ICSE 06 ... the specific requirements for scalability on those dimensions that are deemed important. It is a highly ... not scale . The concept of scalability is desirable in technology as well as business settings. The base ... 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 to easily share a single distributed system. Functional scalability The ability to enhance the system by adding new functionality at minimal effort. Geographic scalability ... in a local area to a more distributed geographic pattern. Load scalability The ability ... does not make sense. date August 2010 Database scalability A number of different approaches ... model to achieve scalability, based on a shared everything architecture that relies upon high speed ... to achieve the highest performance and scalability. ref GigaSpaces. http www.gigaspaces.com WhitePapers .... 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 Dispelling ... In either case, there appears to be no end in sight to the limits of 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 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. 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
Summary Map of Goffle Brook Diamond Brook drainage basin. Image Width 3.75 mi Slightly updated version of previously uploaded image, now with major ponds lakes on Goffle Brook labeled. Original image was jpeg, now converted to png for enhanced scalability. Licensing PD self date December 2008 ... more details
Unreferenced date December 2009 Non functional testing is the testing of a software application for its non functional requirements . 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
Summary Plasma Universe . Because of the scalability of plasma, Hannes Alfv n urged the application of laboratory and magnetospheric data, along with Anthony Peratt s large scale particle in cell simulations, to non in situ space regions. Together with direct observation of interstellar and intergalactic plasma phenomena, a knowledge expansion about the universe, and a backflow of information about laboratory plasmas can be achieved. Adapted from Hannes Alfv n and Anthony Peratt, in IEEE Transactions on Space and Cosmic Plasma 1986 , by User iantresman Ian Tresman . Licensing cc by 2.5 ... 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
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 ... required further scalability and additional reliability beyond that which a single machine configuration ... 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 servers 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 or group of network, compute, storage, and application components that work together to deliver a network service. 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
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
Non free use rationale Article Dip Pen Nanolithography Description A schematic depiction of massively parallel two dimensional nanopatterning Source Dip Pen Nanolithography A Desktop Nanofab Approach Using High Throughput Flexible Nanopatterning March issue of Scanning, in press www.nanoink.net Portion Figure 1b Low resolution yes Purpose Information, promotion this graphic illustrates the key elements of Dip Pen Nanolithography by depicting nanoscopic tips, a meniscus mediating the transport of ink, a variety of different colored inks, and the substrate onto which they are patterned. Further, the image depicts the scalability of the technique, which has evolved to include as many as 55,000 tips writing simultaneously. Replaceability no other information Attribution ... 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
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. 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.iste.co.uk index.php?f a&ACTION View&id 194 Nanocomputers and ... 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 ... with scalability encode these parts first, others later . Meta information . Compressed data may ... 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. Doctor Matthew O Keefe founded this software. Category Red Hat ... more details
wiktionarypar scaling Scaling may refer to Scaling geometry , a linear transformation that enlarges or diminishes objects 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 ... more details
orphan date February 2009 Wikify date April 2010 UETS EFR Universal Ethernet Telecommunications Service Ethernet Fabric Routing is 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. External links http www.lmdata.es uets.htm Resources about UETS in english and spanish Category Networking standards Category Ethernet ... 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
throughout the network. In order to overcome Ethernet s scalability issues, a partitioning scheme ... proposed to increase VLAN s scalability. A first proposal, called Q in Q, also known as Provider ... of supported customers is still limited to 4094. Q in Q also introduces a scalability issue within ... overcomes the inherent scalability limitations of VLAN and Q in Q networks that make them impractical ... table scalability. The same feature assigning a MAC address per edge device, not per service creates a scalability issue for multipoint services. Multipoint services require full mesh connectivity between ... time solving its addressing space scalability issues described previously. Increasing the VLAN tag size ... the size of forwarding tables and creates scalability. Millions of point to multipoint services ... more details
Infobox Software name Apache Mahout logo screenshot caption collapsible yes developer Apache Software Foundation status Active latest release version 0.4 latest release date release date 2010 10 31 latest preview version latest preview date operating system Cross platform size programming language Java programming language Java genre machine learning algorithms license Apache License Apache 2.0 Licence website http mahout.apache.org Mahout is an Apache project to produce free software free implementations of distributed computing distributed or otherwise Scalability scalable machine learning algorithms on the Hadoop platform. External links http mahout.apache.org Apache Mahout overview Category Apache Software Foundation Mahout Apache free software stub computer stub ... more details
CloudStore KFS, previously Kosmosfs is Kosmix s C implementation of Google File System. It parallels the Hadoop project, which is implemented in Java. CloudStore supports incremental scalability, replication, checksumming for data integrity, client side fail over and access from C , Java and Python. There is a FUSE Linux FUSE module so that the file system can be mounted on Linux. In 2007 Kosmix published CloudStore as open source. References refbegin http www.skrenta.com 2007 09 kosmix releases google gfs wor.html Kosmix releases Google GFS workalike KFS as open source refend See also Google File System List of file systems GlusterFS Moose File System MooseFS External links http kosmosfs.sourceforge.net CloudStore page on sourceforge http kosmosfs.wiki.sourceforge.net CloudStore wiki Category Free software programmed in C Category Distributed file systems Category User space file systems storage software stub ... more details
orphan date July 2009 In Performance Engineering , Operational Analysis ref http portal.acm.org citation.cfm?id 356733.356735 The Operational Analysis of Queuing Network Models ref is a set of basic quantitative relationships between performance quantities. Basically the Operational Analysis is based on operational laws, eg. Utilization Law , Service Demand Law , The Forced Flow Law , Little s Law and Interactive Response Time Law and is used to predict the Response Time , Throughput , Availability , Reliability engineering Reliability , Security , Scalability and Extensibility . See also Performance Engineering Queueing Theory References references External links http www unix.ecs.umass.edu krishna ece673 denning.pdf The Operational Analysis of Queueing Network Models Category Performance management DEFAULTSORT Performance Operational Analysis Comp sci stub ... more details
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