Abstract

Many tools for debugging parallel programs offer valuable information to programmers but work in only a limited range of situations. For example, they may help a programmer detect a specific class of program errors, or they may work on just one parallel machine. A broadly useful debugger should offer several views of a program's behavior, and it should work equally well on many parallel architectures. Furthermore, the user should be able to design and install new program views that match the structure of a particular program. In this paper we describe Panorama, a parallel debugger that should offer these benefits. Panorama offers the programmer multiple views of the program's behavior, and it includes a simple logging and replay facility that allows parallel programs be debugged either "on-line" or "post-mortem." 1 Introduction Two obstacles block the widespread use of parallel debugging techniques that have appeared in the literature over the past several years. First, many debuggin...

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