Abstract
Scalable and reliable distributed object-oriented computing (DOC) middleware
systems is an important technology in, for example, telecommunications service
logic and distributed web servers. The Common Object Request Broker Architecture
(CORBA), developed by the Object Management Group (OMG) is a speci
cation of a common platform for DOC systems. CORBA acts as middleware,
by inserting itself between the Operating System (OS) layer and the Application
layer on a host. CORBA provides support for transparent interaction of objects
situated on different nodes. The original CORBA specications had no support
for timing constraints in applications and very little support in the terms of performance
optimizations. Present extension to CORBA include support for real-time
applications and a number of performance enhancements such as load balancing.
However, no work so far address the issue of overload in a CORBA system. This
paper presents a discussion of overload issues in distributed CORBA systems with
time-constrained tasks. First a performance model of a CORBA system is introduced.
Second, overload in distributed CORBA systems is discussed. Third, a
number of classic overload protection mechanisms are applied to the performance
model and investigated using simulation. The simulations show that even by using
very simple protection mechanism, a good throughput can be achieved.
systems is an important technology in, for example, telecommunications service
logic and distributed web servers. The Common Object Request Broker Architecture
(CORBA), developed by the Object Management Group (OMG) is a speci
cation of a common platform for DOC systems. CORBA acts as middleware,
by inserting itself between the Operating System (OS) layer and the Application
layer on a host. CORBA provides support for transparent interaction of objects
situated on different nodes. The original CORBA specications had no support
for timing constraints in applications and very little support in the terms of performance
optimizations. Present extension to CORBA include support for real-time
applications and a number of performance enhancements such as load balancing.
However, no work so far address the issue of overload in a CORBA system. This
paper presents a discussion of overload issues in distributed CORBA systems with
time-constrained tasks. First a performance model of a CORBA system is introduced.
Second, overload in distributed CORBA systems is discussed. Third, a
number of classic overload protection mechanisms are applied to the performance
model and investigated using simulation. The simulations show that even by using
very simple protection mechanism, a good throughput can be achieved.
| Original language | English |
|---|---|
| Publisher | [Publisher information missing] |
| Publication status | Published - 2002 |
Publication series
| Name | NetRG Publications |
|---|
Subject classification (UKÄ)
- Communication Systems
- Electrical Engineering, Electronic Engineering, Information Engineering