Abstract
Extended or Level 2 BLAS is intended to improve the performance of portable programs on high-performance computers. In this paper we examine where Extended BLAS routines may be inserted in LINPACK so that no changes in the parameter list have to be made. We also discuss why, for some algorithms, a simple restructuring in terms of Level 2 BLAS fails. We do not attempt to redesign the algorithms or to change the data structure. We concentrate on the translation of calls to the original (Level 1) BLAS into calls to Level 2 BLAS to improve readability, modularity, and efficiency. This examination results in a still portable subset of LINPACK with a better performance than the original routines. The measured performances of original and modified LINPACK routines on the CDC CYBER 990, CDC CYBER 205, CRAY X-MP, and the NEX SX-2 are compared and analyzed.
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