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Parallel Density Functional Theory Energies using the Fourier Transform Coulomb Method

机译:傅里叶变换库仑方法的平行密度泛函理论能量

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The recently described Fourier transform Coulomb (FTC) algorithm for fast and accurate calculation of density functional theory (DFT) energies (Füsti-Molnar, L; Pulay, P. J. Chem. Phys. 2002, 117, 7827) has been parallelized. We present several calculations showing the speed and accuracy of our new parallel FTC energy code, comparing its performance with our standard all-integral DFT code. Although it still contains significant serial code, the parallel FTC algorithm is up to 6 times faster overall than our parallel all-integral algorithm, and well over an order of magnitude faster for computation of the Coulomb terms, with essentially no loss in accuracy. Proposed improvements should significantly increase these factors. The Coulomb energy in DFT energy calculations can now be computed accurately for large molecules and/or basis sets faster than the exchange-correlation energy.
机译:最近并行化了用于快速和准确地计算密度泛函理论(DFT)能量的傅里叶变换库仑(FTC)算法(Füsti-Molnar,L; Pulay,P. J. Chem。Phys。2002,117,7827)。我们提供了一些计算结果,显示了我们新的并行FTC能量代码的速度和准确性,并将其性能与标准的全集成DFT代码进行了比较。尽管它仍然包含大量的串行代码,但是并行FTC算法的总体速度比我们的并行全积分算法快6倍,并且计算库仑项的速度要快一个数量级,而准确性几乎没有损失。拟议的改进应大大增加这些因素。现在,与交换相关能量相比,DFT能量计算中的库仑能量可以更快地针对大分子和/或基集进行精确计算。

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