International Business Machines Corporation

David Bernstein

Kimming K So

A serializatin debugging facility operates by assisting the computer programmer in the selection of parallel sections of the parallel program for single processor execution in order to locate errors in the program. Information is collected regarding parallel constructs in the source program. This information is used to establish program structure and to locate sections of the program in which parallel constructs are contained. Program structure and the locations of parallel constructs within a program are then displayed as a tree graph. Viewing this display, a programmer selects parallel sections for serialization. Object code for the program is then generated in accordance with the serialization instructions entered by the programmer. Once executed, the programmer can compare the results of execution of parallel sections of the program in a single processor and a multiprocessor environment. Differing execution results in each environment is indicative of a parallel programming error which can then be corrected by the programmer. The programmer can repeat these steps, each time selecting different sections of the program for serialization. In this way, erroneous sections of the program can be localized and identified.

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David Bernstein