The paper introdues the concept of colletive breakpoints and macrosteps.Based on the collevtive breakpoints the macrostep-by-macrostep execution mode has been defined.After introducing the concept of the execution tree and meta-breakpoints the systematic debugging of message passing parallel programs is explained.The main features and distributed structure of DIWIDE,a macrostep debugger is described.The integration of DIWIDE into the GRADE and WINPAR parallel programming environments is outlined.
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