OpenACC is a parallel programming model for automatic parallelization of sequential code using compiler directives or pragmas. OpenACC is intended to be used with accelerators such as GPUs and Xeon Phi. The different implementations of the standard, although still in early development, are primarily focused on GPU execution. In this study, we analyze how the different OpenACC compilers available under certain premises behave when the clauses affecting the underlying block geometry implementation are modified. These clauses are the Gang number, Worker number, and Vector Size defined by the standard.
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