首页> 外文会议>Supercomputing, 2005. Proceedings of the ACM/IEEE SC 2005 Conference >16.447 TFlops and 159-Billion-dimensional Exact-diagonalization for Trapped Fermion-Hubbard Model on the Earth Simulator
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16.447 TFlops and 159-Billion-dimensional Exact-diagonalization for Trapped Fermion-Hubbard Model on the Earth Simulator

机译:地球模拟器上受困的费米-哈伯德模型的16.447 TFlops和1590亿维精确对角化

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In order to study a possibility of superfluidity in trapped atomic Fermi gases loaded on optical lattices, we implement an exact diagonalization code for the trapped Hubbard model on the Earth Simulator. Comparing two diagonalization algorithms, we find that the performance of the preconditioned conjugate gradient (PCG) method is 1.5 times superior to the conventional Lanczos one since the PCG method can conceal the communication overhead much more efficiently. Consequently, the PCG method shows 16.447 TFlops (50.2% of the peak) on 512 nodes. On the other hand, we succeed in solving a 159-billion-dimensional matrix by using the conventional Lanczos method. To our knowledge, this dimension is a world-record. Numerical results reveal that an unconventional type of superfluidity specific to the confined system develops under repulsive interaction.
机译:为了研究负载在光学格的截图原子费米气体中的超浊度,我们在地球模拟器上实现了被困船舶模型的精确对角化码。比较两个对角化算法,我们发现预处理的共轭梯度(PCG)方法的性能是传统的Lanczos的1.5倍,因为PCG方法可以更有效地隐藏通信开销。因此,PCG方法在512个节点上显示16.447 TFLOPS(峰值的50.2%)。另一方面,我们通过使用传统的LANCZOS方法来成功解决159亿维矩阵。为了我们的知识,这个维度是世界纪录。数值结果表明,在排斥相互作用下,狭窄系统特异性特异性的非常规型超浊度。

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