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Computer Science 5204

Operating Systems Fall, 2000 Dr. Dennis Kafura. Computer Science 5204. Course Overview. object model tuple space model agent model metasystem model transaction model. Models of Computing. In this course we will study a number of different models that appear in distributed systems:.

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Computer Science 5204

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  1. Operating Systems Fall, 2000 Dr. Dennis Kafura Computer Science 5204 Course Overview CS 5204 Fall 99

  2. object model • tuple space model • agent model • metasystem model • transaction model Models of Computing In this course we will study a number of different models that appear in distributed systems: CS 5204 Fall 99

  3. data data data data data code code code code code Object Model encapsulated object interacting objects address space/machine distributed objects CS 5204 Fall 99

  4. write/add tuple space generate read/remove process process process Tuple Space Model CS 5204 Fall 99

  5. machine/node machine/node local resource agent Agent Model migrate CS 5204 Fall 99

  6. Metasystem model . . . Cluster: very high speed, low latency network (e.g. myrinet) Grid: CS 5204 Fall 99

  7. transaction manager data manager Transaction Model CS 5204 Fall 99

  8. Examples of Models • Fixed computation-transportable data • Object-based • CORBA (OMG) • RMI (Java) • Com/Dcom (MS) • Transportable computation-transportable data • Metasystems • Globus • Legion • Agents • Voyager • Aglets CS 5204 Fall 99

  9. Major Topics • Concurrency, Synchronization, Coordination • programming languages: Java • modeling/analysis languages: CCS • Distributed Scheduling • Fault Tolerance/Recovery • Protection/Security CS 5204 Fall 99

  10. concurrency fault tolerance security scheduling object tuple space agent metacomputing transaction Models Relationship of Models to Issues Issues Problem Space CS 5204 Fall 99

  11. Concurrency, Synchronization, Coordination • safety vs. liveness • safety: insuring consistency of system • liveness: insuring progress of systems activity • conservative vs. optimistic: • conservative: refuse to perform any action unless the system's consistency can be guaranteed • optimistic: perform actions with the expectation of their successful completion and be prepared to recovery to a consistent state if they cannot be completed CS 5204 Fall 99

  12. Forms of Synchronization • mutual exclusion ­ preventing concurrent access to shared objects to preserve the consistency of the object • condition synchronization ­ blocking attempted operations on a shared object until that object is in a state where the operation will preserve the consistency of the object CS 5204 Fall 99

  13. Java as a Concurrency Programming Language • Language: • language concepts for threads and synchronization • platform independent • Libraries for basic network programming • sockets • Remote Method Invocation • Used to implement distributed systems • Aglets • Voyager CS 5204 Fall 99

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