science

Virtual resource partitioning

Virtual resource partitioning is a 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 Virtual resource partitioning rather than just read about it. In short: Virtual resource partitioning (VRP) is an operating system-level virtualization technology that allocates computing resources (such as CPU & I/O) to transactions. Conventional virtualization technologies allocate resources on an operating system (Windows, Linux...) wide basis.

Key takeaways

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

Reference excerpt

Virtual resource partitioning (VRP) is an operating system-level virtualization technology that allocates computing resources (such as CPU & I/O) to transactions. Conventional virtualization technologies allocate resources on an operating system (Windows, Linux...) wide basis. VRP works 2 levels deeper by allowing regulation and control of the resources used by specific transactions within an application. In many computerized environments, a single user, application, or transaction can appropriate all server resources and by that, affect the quality of service & user experience of other active users, applications or transactions. For example, a single report in a data warehouse environment can monopolize data access by demanding large amounts of data. Similarly, a CPU-bound application may consume all server processing power and starve other activities. VRP allows balancing, regulating and manipulating the resource consumption of individual transactions, and by that, improving the overall quality of service, compliance with service level agreements, and the ultimate end user experience.

Technology overview VRP is usually implemented in the OS in a way that is completely transparent to the application or transaction. The technology creates virtual resource "lanes", each of which has access to a controllable amount of resources, and redirects specific transactions to those lanes allowing them to take more or less resources. VRP can be implemented in any OS and is available on Windows, Red Hat, Suse, HP-UX, Solaris, tru64, AIX and others. In any OS, the application communicates with the OS kernel in a specific way which requires a different VRP implementation. A safe implementation of VRP usually combines several resource allocation techniques. VRP implementations depend on rapidly varying transaction type, consumed resource and kernel state. The VRP implementation must adapt to such changes in real-time.

References

VRP as a new trend in the IT industry VRP technical overview as implemented by one of the VRP vendors Archived 2012-10-06 at the Wayback Machine

Worked examples

Example 1 — a first encounter with Virtual resource partitioning

Start with the simplest possible case. Write down what Virtual resource partitioning claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 Virtual resource partitioning 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 Virtual resource partitioning 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 Virtual resource partitioning

In research: Virtual resource partitioning appears in 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 Virtual resource partitioning 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: Virtual resource partitioning is common in secondary-school and first-year university syllabi. It links to neighbouring topics Virtualization, so understanding it makes those chapters shorter.
In everyday life: Look for Virtual resource partitioning 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 Virtual resource partitioning in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Virtual resource partitioning 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 Virtual resource partitioning out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Virtual resource partitioning in simple terms?

Why does Virtual resource partitioning matter?

Because it connects several 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 Virtual resource partitioning?

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 Virtual resource partitioning.