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NANOPACK: parallel codes for semiempirical quantum-chemical calculations of large systems in the sp- and spd-basis

Berzigiyarov P. K., Zayets V. A., Ginzburg I. Ya., Razumov V. F., Sheka E. F.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2002

Vol. 6, No 2

233-251

A parallel implementation of the conventionally used NDDO (MNDO, AM1, PM3, CLUSTER-Z1) and modified NDDO-WF (CLUSTER-Z2) techniques for semiempirical quantum-chemical calculations on large molecular systems in the sp- and spd-basis, respectively, is described. The atom-pair distribution of data over processors forms the basis of the parallelization. The technological aspects of designing scalable parallel calculations on supercomputers (by using ScaLAPACK and MPI libraries) are discussed. The scaling of individual algorithms and entire package was carried out for model systems with 894, 1920, and 2014 atomic orbitals. The package speedup provided by different multi-processor systems involving a cluster of the Intel PIII processors, Alpha-21264-processor-built machine MBC-1000M, and CRAY-T3E, is analyzed. The effect of computer characteristics on the package performance is discussed.

Program package MP-ZAVA for parallel quantum-chemical computing in the spd-basis

Berzigiyarov P. K., Zayets V. A., Razumov V. F., Sheka E. F.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2001

Vol. 5, No 3

271-300

A parallel realization of the NDDO-WF technique for semi-empirical quantum-chemical calculations on large molecular systems in the spd-basis is described. The technological aspects of designing scalable parallel calculations on super computers (by using MPI library) are discussed. The scaling of individual algorithms and entire package was carried out for two model systems with a number of atomic orbitals of 894 and 2014, respectively. The speedup was determined in computer experiments with the RM600 E60 and Cluster Intel PIII multi-processor systems. The effect of communication rate on the package performance is discussed.