Parallel direct four-index transformations

被引:28
作者
Wong, AT [1 ]
Harrison, RJ [1 ]
Rendell, AP [1 ]
机构
[1] SERC, DARESBURY LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND
来源
THEORETICA CHIMICA ACTA | 1996年 / 93卷 / 06期
关键词
parallel; four-index transformation; Moller-Plesset;
D O I
10.1007/BF01129213
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two parallel direct integral transformation algorithms are presented, Specific attention is directed to producing transformed integrals containing at least two ''active orbital'' indices. The number of active orbitals is typically much less than the total number of molecular orbitals reflecting the requirements of a wide range of correlated electronic structure methods. Sample direct second-order Moller-Plesset theory calculations are reported. For situations where multipassing of the integrals is required, superlinear speedup is obtained by exploiting the increase in global memory. As a consequence, for morphine in a 6-31G basis, a speedup of over 25 is observed in scaling from 32 to 512 processors.
引用
收藏
页码:317 / 331
页数:15
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