Heterogeneous computing is a new branch of parallel processing and expected to reach super speedup. It is an important step for heterogeneous computing to extract the heterogeneity hiding in a program. Such work is rather difficult and some concept and terminology are ambiguous. From the point of view of program structure, this paper presents the formal definitions about SISD, SIMD, and MIMD, which are the foundations for extracting program heterogeneity. Moreover, some heterogeneity criterions for several types of loop programs are proposed.
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