Distributed processing in decision support systems
Uloženo v:
| Vydáno v: | PQDT - Global (1995) |
|---|---|
| Hlavní autor: | |
| Vydáno: |
ProQuest Dissertations & Theses
|
| Témata: | |
| On-line přístup: | Citation/Abstract Full Text - PDF |
| Tagy: |
Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!
|
| Abstrakt: | This thesis describes the research done on the development of a heterogeneous distributed processing harness intended to support the implementation of real time decision support systems, and in particular the decision support system for the monitoring and control of water distribution networks. The harness is based on the use of distributed shared memory, which is itself based on the X11 communication protocol. Distributed shared memory (DSM) is a relative newcomer in the computing field. It provides the abstraction of a shared address space spanning the processors of a distributed computing system. The DSM abstraction simplifies programming of new distributed applications as well as it affords the ease of porting existing applications that communicate by means of shared memory. The problem with building a DSM is how to provide good performance, given high memory latency and the high cost of message transmission, without significant deviation from the conventional shared memory model. An additional problem is how to support a DSM which spans heterogeneous architectures, with their differing communication and data representations. The DSM system described here uses the X11 graphics and networking protocol, which can connect certain classes of heterogeneous architecture computers, in a new and novel way to provide a platform for DSM. X11 based distributed shared memory (XDSM) has been used to support an implementation of a control system and also to provide a platform for the Bulk Synchronous Parallel processing model. Research has also been undertaken into the efficient implementation of mutually exclusive access to shared memory, implemented as X11 properties. The performance studies indicate that the X11 protocol does not impose a major time cost overhead on top of the basic (TCP/EP) communication protocol used. XDSM has potential application in industrial process control situations where both homogeneous and heterogeneous computing systems are in use, requiring only that each system computing node provides support for X11. |
|---|---|
| ISBN: | 9781369327236 |
| Zdroj: | ProQuest Dissertations & Theses Global |