Author: Leung, Man-hei
Title: Concurrent/parallel program development system
Degree: M.Sc.
Year: 1997
Subject: Parallel programming (Computer science)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: vii, 89 leaves : ill. ; 31 cm
Language: English
Abstract: The architecture of parallel computer is different from that of uni-processor computer. Sequential programming is based on the well-established Von-Neumann computation model while parallel programming is based on several models. Hence, the development of parallel program is more difficult. In this project, a concurrent/parallel development system has been implemented in order to help software programmers to develop parallel programs. The system follows a proposed development method which is based on well-known function-oriented approach. Data flow diagram (DFD) is the basic model used in the proposed method. As the features of parallel programming languages are different from the sequential programming languages, DFD model is enhanced. Processors can be assigned to processes in a DFD. Process specification is used to define the transformation logic inside processes. Process can be defined as either program or procedure. Bubble can be used to represent multiple copies of processes. Data flow arrow is extended to support asynchronous and synchronous message flow. The development system supports the automatic processor assignment to each process. The assignment is based on the number of message flow, the resource required by each process, and the resource provided by each processor. Several parameters can be specified by programmer to adjust the assignment result. The assignment can be performed after the application has been specified by the DFD model. The assignment problem is a NP hard problem so that only a heuristic solution is given by the system. Process specifications are generated according to the sequence of message flows specified by programmer. Program constructs such as "while" and "if" are supported in the process specification. The syntax of the process specification is based on C language and Parallel Virtual Machine (PVM) function calls. The PVM calls are mainly for process creation and communication. Detail processing logic should be added to the specification by programmer. From these specifications, a program framework is generated by the development tool. Then, the software developer can modify this framework to produce a parallel program that can be executed in the target machine. The development system has been implemented as a workbench. Motif and C language are used in the system implementation. The main functions include data flow diagram editing, processor assignment, message sequence specification, process specification editing, program framework generation and model consistence checking. The system can be executed on Sun workstation and PC Linux station with X-Windows. In summary, the development system provides a user friendly development environment for programmer to specify the parallel application visually. Processor can be assigned automatically to each process. Process creation and message flow statements can be generated by the system. These features can reduce the time to develop parallel programs.
Rights: All rights reserved
Access: restricted access

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