pony - The occam-pi Network Environment

Although concurrency is generally perceived to be a `hard' subject, it can in fact be very simple --- provided that the underlying model is simple. The occam-pi parallel processing language provides such a simple yet powerful concurrency model that is based on CSP and the pi-calculus. This paper presents pony, the occam-pi Network Environment. occam-pi and pony provide a new, unified, concurrency model that bridges inter- and intra-processor concurrency. This enables the development of distributed applications in a transparent, dynamic and highly scalable way. The first part of this paper discusses the philosophy behind pony, explains how it is used, and gives a brief overview of its implementation. The second part evaluates pony's performance by presenting a number of benchmarks

A unified model for inter- and intra-processor concurrency

Although concurrency is generally perceived to be a `hard' subject, it can in fact be very simple --- provided that the underlying model is simple. The occam-pi parallel processing language provides such a simple yet powerful concurrency model that is based on CSP and the pi-calculus. This thesis presents pony, the occam-pi Network Environment. occam-pi and pony provide a new, unified, concurrency model that bridges inter- and intra-processor concurrency. This enables the development of distributed applications in a transparent, dynamic and highly scalable way. The author specified the layout of the pony system as presented in this thesis, and carried out about 90% of the implementation. This thesis is structured into three main parts, as well as an introduction and an appendix. In the introduction, the need for a unified concurrency model is examined in detail. Thereupon, the pony environment is presented as a solution that provides such a unified model. The first part of this thesis is concerned with the usage of the pony environment for the development of distributed applications. It presents the interface between pony and the user-level code, as well as pony's configuration and a sample application. The second part presents the design and implementation of the pony environment. It explains the internal structure of pony, the implementation of pony's components and public processes, and the integration of pony in the KRoC compiler. The third part evaluates pony's performance and contains the final conclusions. It presents a number of performance tests and concludes with a discussion of the work presented in this thesis, along with an outline of possible future research

A unified model for inter- and intra-processor concurrency

Although concurrency is generally perceived to be a `hard' subject, it can in fact be very simple --- provided that the underlying model is simple. The occam-pi parallel processing language provides such a simple yet powerful concurrency model that is based on CSP and the pi-calculus. This thesis presents pony, the occam-pi Network Environment. occam-pi and pony provide a new, unified, concurrency model that bridges inter- and intra-processor concurrency. This enables the development of distributed applications in a transparent, dynamic and highly scalable way. The author specified the layout of the pony system as presented in this thesis, and carried out about 90% of the implementation. This thesis is structured into three main parts, as well as an introduction and an appendix. In the introduction, the need for a unified concurrency model is examined in detail. Thereupon, the pony environment is presented as a solution that provides such a unified model. The first part of this thesis is concerned with the usage of the pony environment for the development of distributed applications. It presents the interface between pony and the user-level code, as well as pony's configuration and a sample application. The second part presents the design and implementation of the pony environment. It explains the internal structure of pony, the implementation of pony's components and public processes, and the integration of pony in the KRoC compiler. The third part evaluates pony's performance and contains the final conclusions. It presents a number of performance tests and concludes with a discussion of the work presented in this thesis, along with an outline of possible future research.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Adding Mobility to Networked Channel-Types

This paper reports the specification of a sound concept for the mobility of network-channel-types in KRoC.net. The syntax and semantics of KRoC.net have also been modified in order to integrate it more seamlessly into the occam-pi language. These new features are currently in the process of being implemented. Recent developments in occam-pi and KRoC (such as live/dead channel-type-ends and mobile processes) are described, together with their impact on KRoC.net. This paper gives an overview of the recent developments in KRoC.net, and presents its proposed final semantics, as well as the proposed interface between the KRoC.net infrastructure and the KRoC compiler

A Unified Model for Inter- and Intra-processor Concurrency

Although concurrency is generally perceived to be a `hard' subject, it can in fact be very simple --- provided that the underlying model is simple. The occam-pi parallel processing language provides such a simple yet powerful concurrency model that is based on CSP and the pi-calculus. This thesis presents pony, the occam-pi Network Environment. occam-pi and pony provide a new, unified, concurrency model that bridges inter- and intra-processor concurrency. This enables the development of distributed applications in a transparent, dynamic and highly scalable way. The author specified the layout of the pony system as presented in this thesis, and carried out about 90% of the implementation. This thesis is structured into three main parts, as well as an introduction and an appendix. In the introduction, the need for a unified concurrency model is examined in detail. Thereupon, the pony environment is presented as a solution that provides such a unified model. The first part of this thesis is concerned with the usage of the pony environment for the development of distributed applications. It presents the interface between pony and the user-level code, as well as pony's configuration and a sample application. The second part presents the design and implementation of the pony environment. It explains the internal structure of pony, the implementation of pony's components and public processes, and the integration of pony in the KRoC compiler. The third part evaluates pony's performance and contains the final conclusions. It presents a number of performance tests and concludes with a discussion of the work presented in this thesis, along with an outline of possible future research

The Distributed occam Protocol - A New Layer on Top of TCP/IP to Serve occam Channels Over the Internet

Networking, especially the internet, is playing a more and more important role in our lives. Many new applications are distributed on several computers which are connected over the internet. The occam parallel processing language offers some features which make it particularly suited for writing applications which are distributed over the internet. Especially the channel paradigm which enables concurrent processes to communicate with each other, is a good basis for distribution. This project deals with the development of a distributed version of occam channels which allow occam processes running on different computers to communicate with each other in a similar way as they would do if they were running on the same machine

Flexible, Transparent and Dynamic occam Networking with KRoC.net

KRoC.net is an extension to KRoC supporting the distribution of occam channels over networks, including the internet. Starting in 2001, the development of KRoC.net has gone through a number of stages, each one making the system more flexible, transparent and dynamic. It now enables the occam programmer to set up and close network channels dynamically. Configuration has been simplified. All occam PROTOCOLs can now be sent over network channels, without need for conversion. Many of the new dynamic features in occam have been used to improve KRoC.net. Many of the concepts in KRoC.net are similar to those in the JCSP Network Edition (JCSP.net), KRoC.net's counterpart in the JCSP world. This paper will give an overview over KRoC.net, its usage, its design and implementation, and its future. It will also provide some benchmarks and discuss how the new occam features are being used in the latest KRoC.net version