Pattern-Independent Detection of Manual Collectives in MPI Programs

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Provided by: RWSoftware
Topic: Big Data
Format: PDF
In parallel applications, a significant amount of communication occurs in a collective fashion to perform, for example, broadcasts, reductions, or complete exchanges. Although the MPI standard defines many convenience functions for this purpose, which not only improve code readability and maintenance but are usually also highly efficient, many application programmers still create their own, manual implementations using point-to-point communication. The authors show how instances of such hand-crafted collectives can be automatically detected. Matching pre- and post-conditions of hashed message exchanges recorded in event traces, their method is independent of the specific communication pattern employed.
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