computer science

Open Grid Services Infrastructure

Open Grid Services Infrastructure is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Open Grid Services Infrastructure rather than just read about it. In short: The Open Grid Services Infrastructure (OGSI) was published by the Global Grid Forum (GGF) as a proposed recommendation in June 2003. It was intended to provide an infrastructure layer for the Open Grid Services Architecture (OGSA).

Key takeaways

Open Grid Services Infrastructure belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Open Grid Services Infrastructure to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Open Grid Services Infrastructure from memory before moving on to harder problems.

Reference excerpt

The Open Grid Services Infrastructure (OGSI) was published by the Global Grid Forum (GGF) as a proposed recommendation in June 2003. It was intended to provide an infrastructure layer for the Open Grid Services Architecture (OGSA). OGSI takes the statelessness issues (along with others) into account by essentially extending Web services to accommodate grid computing resources that are both transient and stateful.

Obsolescence Web services groups started to integrate their own approaches to capturing state into the Web Services Resource Framework (WSRF). With the release of GT4, the open source tool kit is migrating back to a pure Web services implementation (rather than OGSI), via integration of the WSRF. "OGSI, which was the former set of extensions to Web services to provide stateful interactions -- I would say at this point is obsolete," Jay Unger said. "That was the model that was used in the Globus Toolkit 3.0, but it's been replaced by WSRF, WS-Security, and the broader set of Web services standards. But OGSA, which focuses on specific service definition in the areas of execution components, execution modeling, grid data components, and information virtualization, still has an important role to play in the evolution of standards and open source tool kits like Globus."

Implementations Globus Toolkit version 3 contains an implementation of OGSI.

References

Worked examples

Example 1 — a first encounter with Open Grid Services Infrastructure

Start with the simplest possible case. Write down what Open Grid Services Infrastructure claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Open Grid Services Infrastructure before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Open Grid Services Infrastructure ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Open Grid Services Infrastructure

In research: Open Grid Services Infrastructure appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Open Grid Services Infrastructure in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Open Grid Services Infrastructure is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computing stubs, Grid computing, so understanding it makes those chapters shorter.
In everyday life: Look for Open Grid Services Infrastructure outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Open Grid Services Infrastructure in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Open Grid Services Infrastructure means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Open Grid Services Infrastructure out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Open Grid Services Infrastructure in simple terms?

Why does Open Grid Services Infrastructure matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Open Grid Services Infrastructure?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Open Grid Services Infrastructure.