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xirainbow

木虫 (正式写手)

[交流] 【分享】ESPRESSO小组刚写的总结性文章 已有3人参与

6月25号ESPRESSO刚刚写好的文章,投到Journal of physics:Condenced Matter了,还没有正式发表呢;P    大家先睹为快吧;)
     估计以后用ESPRESSO发文章,就需要引这篇文献了;)

申请加精;P

大家看完后有什么感想,有空来聊聊吧;P

[ Last edited by xirainbow on 2009-7-20 at 11:28 ]
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xirainbow

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fegg7502(金币+2,VIP+0):thank you very much! 7-26 21:48
ESPRESSO从物理层面上是如何实现并行的呢?
共分为4个阶段:
1,image parallelizaton:将所有处理器分为n_image组image(每组中包含若干个image)。
2,pool parallelizaton:将每组中的处理器进而分为n_pool个pool,每个pool被用来处理若干个k点。
3,plane-wave parallelizaton:将每个pool中的处理器分为n_pw组。然后将实空间和倒空间中的网格分配给这n_pw组。
4,task-group parallelizaton:处理器进而再被分为n_task组。每一个组被用来处理一个电子态的组合。每一个电子态的组合将被用于傅立叶变换,而傅立叶变换在每一个n_task中式被并行化的。

我的翻译和学术水平太低,大家看起来会比较难受,那就直接看原文吧;)如果我上面写的有不妥之处,还请多多指正;P
“In this hierarchy, groups implementing coarser-grained parallel tasks are split into groups implementing finer-grained parallel tasks. The first level is image parallelization, implemented by dividing processors into nimage groups, each taking care of one or more images (i.e. a point in the configuration space, used by the NEB method). The second level is pool parallelization, implemented by further dividing each group of processors into npool pools of processors, each taking care of one or more k-points . The third level is plane-wave parallelization, implemented by distributing real- and reciprocal-space grids across the nPW processors of each pool. The final level is task group parallelization [79], in which processors are divided into ntask task groups of nFFT = nPW=ntask processors, each one taking care of different groups of electron states to be Fourier-transformed, while each FFT is parallelized inside a task group. A further paralellization level, linear-algebra, coexists side-to-side with plane-wave parallelization, i.e. they take care of different sets of operations, with different data distribution.”

[ Last edited by xirainbow on 2009-7-25 at 11:55 ]
23楼2009-07-25 11:54:18
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xirainbow

木虫 (正式写手)

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wuchenwf(金币+3,VIP+0):谢谢回帖交流 7-24 00:43
我先起个头:)

摘要的第一句是:QUANTUM ESPRESSO is an integrated suite of computer codes for electronic-structure calculations and materials modeling, based on density-functional theory, plane waves, and pseudopotentials (norm-conserving, ultrasoft, and projector-augmented wave).


可是我从没听说,在它提供的赝势库中也没见过ESPRESSO使用过PAW?

[ Last edited by xirainbow on 2009-7-19 at 19:18 ]
2楼2009-07-19 19:16:03
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totem

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小木虫(金币+0.5):给个红包,谢谢回帖交流
fegg7502(金币+1,VIP+0):thank you very much! 7-19 21:06
I think it means people can DIY PAW albeit it is difficult.
3楼2009-07-19 20:25:51
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y1ding

铁杆木虫 (著名写手)

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小木虫(金币+0.5):给个红包,谢谢回帖交流
zxzj05(金币+1,VIP+0):3Q! ^_^ 鼓励讨论! 7-21 16:45
4楼2009-07-20 08:30:24
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