Gateway-based call admission in distributed object oriented systems

Författare

Niklas Widell
Christian Nyberg

Redaktör

Johan M. Karlsson
Ulf Körner
Christian Nyberg

Summary, in English

Many applications in telecommunications will depend on distributed systems to provide

enough capacity. In a distributed system a service is split up into a number of modules

(often called objects) that can be placed at different nodes or processors in a network. A

service can be seen as a number of invocations of the objects in a certain order. There

are a number of performance problems which have to be solved. How shall objects be

distributed on the nodes? How shall the load be distributed among the nodes for a given

object distribution? How shall the distributed system be protected from temporary overload

situations?

In our paper we investigate these questions for distributed systems where requests for

service arrive to a gateway from which they distributed to the nodes of the system. We

assume that the object distribution is given and we concentrate on protecting the system

using three different external load control mechanisms: Percent Thinning, Call Gapping

and Tokens. Using simulations, we nd that Tokens provide the best system protection.

Avdelning/ar