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Explain The Use Of Space Time Diagram In Message Passing Program For Debugging


This document discusses the problems of visually building parallel messaging programs using the working tool Visper. Section 5 presents an example program created in Visper, and Section 6 briefly discusses the usefulness of this approach when debugging parallel programs.


These topics are followed by practical discussions of a series of complex issues related to the design and execution of parallel programs. This tutorial starts with a discussion of parallel computing - what it is and how to use it, and then discusses concepts and terminology related to parallel computing. It is not intended to go into detail about parallel programming as it would take longer.


The topics of parallel memory architectures and programming models are then explored. They represent the dynamics of parallel program execution as a stream of events in a two-dimensional space, where one axis represents time and the other represents the actual individual processors. Actions in parallel programs are distributed in space and time. In Figure 1, the X axis runs horizontally and is used to add processors and processor groups to the programming space.


It's not the same as old computers that were programmed "hard-wired". Known as a "stored program computer" - both program instructions and data are stored in electronic memory. In most cases, serial programs running on modern computers "waste" potential processing power.


Many problems are so large and/or complex that solving them using sequential programs is impractical or impossible, especially given the limited computer memory. Regardless of the possible solution, visual programming tools should be scalable and easy to use, providing users with a graphical representation of the problem regardless of hardware. Over time, many visual programming tools have been developed to assist in this process.


Parallel computing is now widely used around the world in a wide variety of applications. Programming in Visper is not visual in every way, but uses visual mechanisms wherever there is data flow or concurrent controls. Visper does not require the programmer to be familiar with all aspects of the message passing paradigm, but rather allows for a step-by-step approach to building a program, since the language itself hides the complexity of the paradigm.