The Parallel Debugging Tool (PDT) of the Annai programming environmentis developed within the Joint CSCS-ETH/NEC Collaboration in Parallel Processing [1]. Like the other components of the integrated environment, PDT aims to provide support for application developers to debug portable large-scale data-parallelprograms based on HPF and message-passing programs based on the MPI standard. PDT supports MPI event tracing for race detection and deterministic replay for manually parallelized MPI programs as well as for code generated with the advanced techniques of a data-parallel compiler. This paper describes the tracing and replaying mechanisms included in PDT as well as their efficiency by presenting execution time overheads for several benchmark programs running on the NEC Cenju-2/3 distributed-memory parallel computers.

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