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تسجيل مستخدم جديدThe Quest for Optimal Sorting Networks: Efficient Generation of Two-Layer Prefixes
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نشر من قبل
Peter Schneider-Kamp
تاريخ النشر
2014
مجال البحث
الهندسة المعلوماتية
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English
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Previous work identifying depth-optimal $n$-channel sorting networks for $9leq n leq 16$ is based on exploiting symmetries of the first two layers. However, the naive generate-and-test approach typically applied does not scale. This paper revisits the problem of generating two-layer prefixes modulo symmetries. An improved notion of symmetry is provided and a novel technique based on regular languages and graph isomorphism is shown to generate the set of non-symmetric representations. An empirical evaluation demonstrates that the new method outperforms the generate-and-test approach by orders of magnitude and easily scales until $n=40$.
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