Distributed Computing ppt

Distributed Computing ppt

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  www.oeclib.in Submitted By: Odisha ElectronicControl Library Seminar On Distributed Computing
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  Contents • Introduction • HowIt Works • Distributed Computing Management Server • Comparisons and Other Trends • Other Trends at a Glance • Application Characteristics • Types of Distributed Computing Applications • Security and Standards Challenges • Advantages • Disadvantages • Conclusion • References
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  Introduction • The numbersof real applications are still somewhat limited, and the challenges--particularly standardization--are still significant. • But there's a new energy in the market, as well as some actual paying customers, so it's about time to take a look at where distributed processing fits and how it works.
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  How It Works •A distributed computing architecture consists of very lightweight software agents installed on a number of client systems, and one or more dedicated distributed computing management servers. • There may also be requesting clients with software that allows them to submit jobs along with lists of their required resources.
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  How It Works…
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  Distributed Computing ManagementServer • The servers have several roles. • They take distributed computing requests and divide their large processing tasks into smaller tasks that can run on individual desktop systems (though sometimes this is done by a requesting system). • They send application packages and some client management software to the idle client machines that request them. • They monitor the status of the jobs being run by the clients.
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  Distributed vs. OtherTrends
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  Application Characteristics • Obviouslynot all applications are suitable for distributed computing. The closer an application gets to running in real time, the less appropriate it is. • Even processing tasks that normally take an hour are two may not derive much benefit if the communications among distributed systems and the constantly changing availability of processing clients becomes a bottleneck. • Instead you should think in terms of tasks that take hours, days, weeks, and months.
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  Types of DistributedComputing Applications
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  Security and StandardsChallenges • The major challenges come with increasing scale. As soon as you move outside of a corporate firewall, security and standardization challenges become quite significant. • Most of today's vendors currently specialize in applications that stop at the corporate firewall, though Avaki, in particular, is staking out the global grid territory. • Beyond spanning firewalls with a single platform, lies the challenge of spanning multiple firewalls and platforms, which means standards.
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  Advantages • Economics:- – Computersharnessed together give a better price/performance ratio than mainframes. • Speed:- – A distributed system may have more total computing power than a mainframe. • Inherent distribution of applications:- – Some applications are inherently distributed. E.g., an ATM-banking application. • Reliability:- – If one machine crashes, the system as a whole can still survive if you have multiple server machines and multiple storage devices (redundancy).
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  Disadvantages • Complexity :- –Lack of experience in designing, and implementing a distributed system. E.g. which platform (hardware and OS) to use, which language to use etc. • Network problem:- – If the network underlying a distributed system saturates or goes down, then the distributed system will be effectively disabled thus negating most of the advantages of the distributed system. • Security:- – Security is a major hazard since easy access to data means easy access to secret data as well.
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  Conclusion • The advantagesof this type of architecture for the right kinds of applications are impressive. • The most obvious is the ability to provide access to supercomputer level processing power or better for a fraction of the cost of a typical supercomputer.
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  References • www.google.com • www.wikipedia.com •www.oeclib.in
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  Thanks