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Title: Software/Operating Systems/Extensible - BITS The Component Based Operating System: based on describing system resources as independent components, lets applications implement their own abstractions, define their own protection schemes, participa
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BITS: The Component Based Operating System
BITS: The Component Based OperatingSystem OverviewBITS, an operating system project, was investigated in HiPeX researchcentre in City University, London, UK.BITS, based on describing system resources as independent components,enables applications to implement their own abstractions, define theirown protection schemes and participate in resource management strategies. MAGNET,a dynamic resource management framework designed for a component-basedenvironment, provides applications with a flexible, runtime adaptible environment where user-customization of resource allocation strategies are feasible. People who were involved in theprojectPatty KostkovaJulie McCannTim WilkinsonKevin MurrayPaul HawlettGreg Law Motivatons for BITSOperating systems form the interface between system resources and applicationsby providing abstraction of hardware resources, protection of applications,and resource management. However, traditional operating systems limit flexibility,performance and utilization of hardware resources by forcing applicationsto use high-level abstractions, uniform protection schemes, and high-levelstatic resource management.In addition, the role of operating systems has significantly changedwith the ever-increasin g use of heterogeneous distributed systems offeringenormous computational power, and new application requirements --- higherflexibility, extensibility, tailoring services to application-specificdemands and the ability to adapt to frequently changing system conditions.One of the major factors limiting both system flexibility and performanceis fixed high-level abstraction. It has become clear that the requirementsof all applications cannot be met by any operating system in advance. Itis for this reason that current research explores better structured abstractionsto enable finer granularity of system services. Extensible systems (suchas Exokernel) show that presenting real hardware to applications that requirelow-level access allows them to tailor their specific abstractions whichresults in better performance. In addition to user-defined abstractionand better performance, applications in mobile environments with frequentlychanging characteristics pose additional requirements on operating systems--- the ability to participate in dynamic resource management, to supportadaptations to ever-changing conditions, and to express their requirementsin terms of quality of service. A new approach to operating system designand construction is required to enable these requirements to be met.Further, recent approach to software design which has changed the structureof applications and many software products is `componentisation'. The BITSproject is investigating the usage of this methodology as the basis foran operating system, aiming to provide the desired resource managementflexibility and dynamic adaptation of resource-application interfaces.  MAGNET: Resource Manager ina Component-based EnvironmentIn addition to representing resources as independent components and providinguser-defined abstractions and protection (including the ability to accessraw hardware), a component-based architecture should enable dynamic user-customizableresource management. As the BITS system is constructed from independentcomponents, user-tailored computing environments can be easily implementedby enabling applications to select only the components they require. Inaddition, runtime extensibility (such as dynamic resource allocation andreallocation) based on quality of service description can be implemented.These are the features that MAGNETaims to provide in order to enable dynamic and mobile applicationsto fully utilize available resources.  Overview of BITS
The BITS component-based operating system consists of a set of independentcomponents representing system resources. They comprise:Hardware Components(representing hardware devices) and Server Components (representing user-levelabstraction servers). Hardware Components are accessed through a functionalinterface called Simple Hardware which presents raw device drivers to applications,or through Virtual Hardware which provide basic low-level protection ofone application against another. Server Components, running at the user-level,provide applications with high-level abstractions (e.g., file systems,dsm, etc.) MAGNET,the dynamic resource manager, provides runtime resource allocation and,in cooperation with the Glue Generator, establishes interactions betweenclients and servers.Following figure illustrates the structure of BITS operating system. BITS's abstraction approach is to implement only the necessary protectionschemes (encapsulated in the Virtual Hardware), and leave the implementationof high-level abstraction to Server Components.BITS supports protectionat three levels: Virtual Hardware (low-level hardware protection), MAGNET(protection service requests and offers), and component-to-componentprotection.Finally, check our papers on BITS and MAGNET. |
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The | Component | Based | Operating | System: | based | on | describing | system | resources | as | independent | components, | lets | applications | implement | their | own | abstractions, | define | their | own | protection | schemes, | participa |
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http://www.soi.city.ac.uk/~patty/bits.html
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