Distributed Systems Lecture 5 - DNS, BOINC, PlanetLab, OLPC
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This document discusses several distributed computing systems: 1) DNS is a distributed system that maps domain names to IP addresses using a hierarchical naming structure and caching DNS servers for efficiency. 2) BOINC is a volunteer computing platform that uses over a million computers worldwide for distributed applications like disease research. It provides incentives and verifies results to prevent cheating. 3) PlanetLab is a research network with over 700 servers globally that allows testing new distributed systems at large scales under realistic conditions. It isolates projects using virtualization and trust relationships.
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Distributed Systems Lecture 5 - DNS, BOINC, PlanetLab, OLPC
- 1. Lecture 5 - Other Distributed Systems CSE 490h – Introduction to Distributed Computing, Spring 2007 Except as otherwise noted, the content of this presentation is licensed under the Creative Commons Attribution 2.5 License.
- 3. DNS: The Distributed System in the Distributed System
- 5. A Manageable Problem © 2006 Computer History Museum. All rights reserved. www.computerhistory.org
- 11. BOINC
- 23. PlanetLab
- 35. OLPC “ They want to deliver vast amounts of information over the Internet. And again, the Internet is not something you just dump something on. It's not a big truck. It's a series of tubes .”
- 37. … it probably looks something like this Photo: cmu.edu
Editor's Notes
- This allows multiple machines named “CS” in the world For unfortunate reasons, the most significant label is to the right, instead of the left.
- Pitfalls of this design: -- requires literally billions or more queries to root servers in a day – far too much stress -- requires every individual computer to make lots of requests to many different machines
- Alright, maybe Senator Stevens isn’t entirely correct, but he’s right about one thing: the internet is composed of some sort of infrastructure.
- This is a composited satellite image of the earth at night. This is meant to demonstrate that there are a lot of spaces which lack infrastructure even for electricity. A real map of internet infrastructure would probably show even greater infrastructural disparity between the wealthier developed nations and the developing nations.
- Cheap: Fiber costs nearly $50k per mile in rural areas, Cisco routers with 80 ports are around $7k, desktop computers are $300-$400, and the cost of powering this equipment reliably is tremendously expensive in a developing nation
- Founded by Nicholas Negroponte while he was working at MediaLab. Took the project outside of the lab to form a new non-profit NGO called OLPC. Backed by many industry leaders, including: Quanta (manufacturer), eBay, AMD, Google, Red Hat. Mission: provide the laptop at a low cost (in terms of both hardware and operation) to facilitate its purchase by governments of developing nations; provide rich, open-source software tools to allow teachers and children to create, develop and discover knowledge; provide high-bandwidth connectivity to enable the development of knowledge communities. OLPC: If you give each child access simultaneous access to the Internet (or even a local copy of Wikipedia stored at some village server) you can provide them with more knowledge than the biggest library in the world, and at a lower cost. Improving the educational experience in drastic ways to create long-term effects towards providing fair, equitable, and economically and socially viable societies.
- Of course, all of this is good for us (and the rest of the developed nations). Simple math can tell you that an expansion of the market (potentially 5 fold!) means more commerce here too!
- Certainly, children are the future of any nation. If we can elevate the level of education, we can create more opportunities for them to compete and grab a share of global markets, and standard of living will rise. India and China are already bringing themselves out of poverty, largely because of the commerce they have with developed nations.