Tài liệu High Performance Computing on Vector Systems-P2 pptx

... parallelization, partial and condi- tional vectorization, index migration, loop collapsing, nested loop vectorization, conversions, common expression elimination, code motion, exponentiation opti- mization, ... opti- mization, optimization of masked operations, loop unrolling, loop fusion, inline subroutine expansion, conversion of division to multiplication and instruction scheduling. Compil...

Ngày tải lên: 15/12/2013, 13:15

... applications on such platforms has become major concern in high performance computing. The latest gener- ation of custom-built parallel vector systems have the potential to address this concern for ... Split-Merge on www.verypdf.com to remove this watermark. Performance Evaluation of Lattice-Boltzmann Magnetohydrodynamics Simulations on Modern Parallel Vector Systems Jonathan...

Ngày tải lên: 24/12/2013, 19:15

... equilibrium condition, the conventional Fermi-Golden rule dealing the electron-phonon coupling thus does not work. Under such a non-equilibrium condition, the real-time propagation must be treated ... electronic excitations [5]. In addition to the ‘real-time propagation’ of electrons [4], we treat ionic motion within Ehrenfest approximation [6]. Since ion dynamics requires typical simulation...

Ngày tải lên: 24/12/2013, 19:15

... good portion of the theoretical peak performance on the vector machine. Block operations are not only efficient on vector systems, but also on scalar architectures [9]. The results of matrix vector multiplication ... machines because they lead to long vector lengths. Block computations are necessary to achieve a good portion of peak performance not only on vector machines,...

Ngày tải lên: 24/12/2013, 19:15

... contains many integer operations and non-vectorized if-branches, whereas the flow solution procedure has a simple code structure, is well vector- ized and contains only floating point operations. The ... 50 iterations of the flow solver were performed in order to converge the dual-time stepping method. The simulation was executed on the NEC SX-6 vector computer at the High Performance...

Ngày tải lên: 24/12/2013, 19:15

... SX6+ the performance increases subproportionally beyond 6 CPUs. For the Γ -point only version, the scaling degrades beyond 4 CPUs, but this version is still faster than the full version. If only ... inlet boundary conditions can be found in [10]. For elbow draft tube two grids were used (180000 and 1 million elements). Computational grid and the inlet boundary conditions (part load operatio...

Ngày tải lên: 24/12/2013, 19:15

... leads to a non-linear system of algebraic equations, which is solved by Newton-Raphson iteration with explicit construction and inversion of the corresponding Jacobian matrix. Inversion of the ... region. Only the molecule positions of the “halo” molecules have to be communicated, which is done in 3 consecutive steps: first x, then y and final the z direction. The diagonal directions are done i...

Ngày tải lên: 24/12/2013, 19:15

... Discretization As we use a conservative formulation, convective terms are discretized as one term to better restrain conservation equations. Viscous terms are expanded be- cause computing the second ... the conservative variables Q. 2.5 Boundary Conditions The modular concept for boundary conditions allows the application of the code to a variety of compressible flows. Each boundary conditio...

Ngày tải lên: 24/12/2013, 19:15

... eigenfunctions from linear stability theory (see Sect. 4.3) in accordance with the characteristic boundary condition. One- dimensional characteristic boundary conditions posses low reflection coefficients for ... x-andy-direction is used. In stream- wise direction the grid is uniform with spacing Δx =0.157 up to the sponge region where the grid is highly stretched. In normal direction the grid i...

Ngày tải lên: 24/12/2013, 19:15

... don’t require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: High Performance MySQL: Optimi- zation, Backups, Replication, and More, Second ... simple que- ries per second on commodity server hardware and over 2,000 queries per second 158 | Chapter 4: Query Performance Optimization from a single correspondent on a Gigabit network, s...

Ngày tải lên: 10/12/2013, 06:15