Improved parallelization techniques for the density matrix renormalization group

Details Improved parallelization techniques for the density matrix renormalization group Improved parallelization techniques for the density matrix renormalization group

2009-09-30

arxiv.org/abs/0909.5662v3

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures; version published in Computer Physics Communications

Scientific paper

10.1016/j.cpc.2010.03.018

A distributed-memory parallelization strategy for the density matrix renormalization group is proposed for cases where correlation functions are required. This new strategy has substantial improvements with respect to previous works. A scalability analysis shows an overall serial fraction of 9.4% and an efficiency of around 60% considering up to eight nodes. Sources of possible parallel slowdown are pointed out and solutions to circumvent these issues are brought forward in order to achieve a better performance.

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