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Increased scalability of the StormCast distributed application
(Research report; Forskningsrapport, 1994-09)
Scaling is recognized as a primary concern in developing distributed applications. Scaling problems occur when an application reach its upper boundary in some way or another. This paper describes the considerations made in the redesign of the StormCast distributed application to achieve more scalability. Naturally, there can be many factors that restrict a system's scalability. The challenge meeting ...
On the design and performance of the PARFUM Parallel Fault Tolerant Volume Renderer
(Research report; Forskningsrapport, 1997-01)
Volume rendering is an important and CPU-intensive technique for visualizing large scalar fields. In essence, a volume renderer performs two activites on behalf of the user: loading a new data set, and rendering the current one. At one level, the performance of an individual activity is important. At another level, the erformance of the session as a whole, in particular switching from one activity ...
A Declarative Profile Model for Qos negotiation
(Research report; Forskningsrapport, 2005-12)
In this report we define the semantics of a language for dynamic QoS expressions which can be evaluated at run-time for conformance. We define how expressions can be constructed from atomic expressions termed ’basic profiles’ using composition operators. Two such operators are defined: The sum ( ’+’ )
which corresponds to simple conjunction and component-sum (’Å’) which assume that the operands ...
Engineering push-based web services
(Research report; Forskningsrapport, 2005)
Much of the content of popular Internet information
sources is highly dynamic: urgent in nature and sometimes
relevant only for a short time. The typical approach
to querying such dynamic sources is polling for
updates often.1 This strains the traditional pull-based
Internet and wastes network resources on transmitting
redundant information.
This paper focuses on how to structure the Internet
to ...
An extensible software architecture for mobile components
(Research report; Forskningsrapport, 2000-10-06)
This paper presents a generic software architecture for large-scale distributed applications where mobile agents are an integral part. We have devised this architecture through completion of a series of mobile agent systems and associated applications over the last 8 years.
Minimizing unwanted traffic in a global messaging system. Spam, denial-of-service-attacks, and edacious subscribers
(Research report; Forskningsrapport, 2005)
The main purpose of this paper is to illuminate two types of unwanted traffic in a publish/subscribe system -- malicious (spam, DoS attacks) and vain (unused events) -- and suggest a general mechanism for minimizing their effects. We do this by augmenting the classic publish/subscribe interface with volume-limiting parameters -- a combination of attributes assigned to events by publishers and ...
File repository transfer protocol. Version 1
(Research report; Forskningsrapport, 1995-02)
This document presents and specifies the protocol that interfaces clients and servers in the File Repository (FR). The FR is a software system that supports sharing of files. The protocol is modelled after Smtp and Nntp and is encoded in Ascii. No details of server implementation is visible in the protocol description, but we state our intentions at several occasions.
Secure communication in FRTP
(Research report; Forskningsrapport, 1995-02)
To ensure privacy, users of the File Repository Transfer Protocol (Frtp) may require that communication partners are properly authenticated. If one partner wants the communication to be crypted, the other must honor the request. This report describes how authentication and privacy are realized. It is shown, by means of an authentication logic, that the protocol achives its goal in this respect.
Performance experiments with the Storm View Distributed Parallel Volume Renderer.
(Research report; Forskningsrapport, 1995-06)
Volume rendering is a useful but cpu-intensive method for visualizing large scalar fields. The time to render a single image may be reduced by parallel processing. This paper reports on performance experiments with the StormView volume renderer, which is parallelized on a set of 57 MIPS / 17 MFLOPS workstations connected by a 10 Mbps Ethernet. For certain user patterns, we show that our parallelization ...
A graphical deployment and management tool for distributed applications
(Research report; Forskningsrapport, 2005)
OOPP is a component based middleware platform with support for complex distributed applications. The main goal of OOPP is to create an expressive programming model for distributed applications where by default details are hidden for the programmer. When necessary, reflection is used to expose and sometimes modify these details. All interaction with an OOPP component are specified by its component ...