检索结果-南通市图书馆

Core and Uncore Joint Frequency Scaling Strategy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer and Communications 2018年第12期6卷 184-201页

作者： Vaibhav Sundriyal Masha Sosonkina Bryce Westheimer Mark Gordon Old Dominion University Norfolk VA USA Department of Chemistry Iowa State University Ames Laboratory Ames IA USA

Energy-proportional computing is one of the foremost constraints in the design of next generation exascale systems. These systems must have a very high FLOP-per-watt ratio to be sustainable, which requires tremendous improvements in power efficiency for modern computing systems. This paper focuses on the processor—as still the biggest contributor to the power usage—by considering both its core and uncore power subsystems. The uncore describes those processor functions that are not handled by the core, such as L3 cache and on-chip interconnect, and contributes significantly to the total system power. The uncore frequency scaling (UFS) capability has been available to the user since the Intel Haswell processor generation. In this paper, performance and power models are proposed to use both the UFS and dynamic voltage and frequency scaling (DVFS) to reduce the energy consumption in parallel applications. Then, these models are incorporated into a runtime strategy that performs processor frequency scaling during parallel application execution. The strategy can be implemented at the kernel/firmware level, which makes it suitable for improving the energy efficiency of exascale design. Experiments on a 20-core Haswell-EP machine using the quantum chemistry application gamess and NAS benchmark resulted in up to 24% energy savings with as little as 2% performance loss.

关键词： Uncore Frequency Scaling (UFS) Dynamic Voltage and Frequency Scaling (DVFS) Power gamess Energy Savings NAS Benchmarks

Study of Intermolecular Interactions in Liquid Crystals: Para-butyl-p’-cyano-biphenyl

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Crystallization Process and Technology 2014年第1期4卷 31-38页

作者： K. K. Dwivedi M. K. Dwivedi S. N. Tiwari Department of Physics D.D.U. Gorakhpur University Gorakhpur India.

Various characteristics of mesomorphism can be explained using intermolecular interactions between a pair of liquid crystalline molecules. The intermolecular interactions have been calculated considering multipole-multicentere expansion method and modified by second order perturbation treatments. For calculation of multipole i.e. charge, dipole, etc. at each atomic center of molecules, para-butyl-p’-cyano-biphenyl, gamess, an ab initio program, with 6-31G* basis set has been used. The stacking, in-plane and terminal interaction energies explain the liquid crystalline behaviour of the system.

关键词： Liquid Crystals Phase Transition Intermolecular Interactions gamess Multicentred-Multipole Expansion

Maximizing Performance under a Power Constraint on Modern Multicore Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer and Communications 2019年第7期7卷 252-266页

作者： Vaibhav Sundriyal Masha Sosonkina Bryce Westheimer Mark S. Gordon Old Dominion University Norfolk Virginia USA Iowa State University and Ames Laboratory Ames IA USA

Energy efficiency and energy-proportional computing have become a central focus in modern supercomputers. These supercomputers should provide high throughput per unit of power to be sustainable in terms of operating cost and failure rates. In this paper, a power-bounded strategy is proposed that maximizes parallel application performance under a given power constraint. The strategy dynamically allocates power to core, uncore, and memory power domains within a node to maximize performance under a given power budget. Experiments on a 20-core Haswell-EP platform for a real-world parallel application gamess demonstrate that the proposed strategy delivers performance within 4% of the best possible performance for as much as 25% reduction in the minimum power budget required for maximum performance.

关键词： Uncore Frequency Scaling (UFS) Dynamic Voltage and Frequency Scaling (DVFS) Power Budget gamess

量子化学计算程序向Windows集群的移植实现

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

四川轻化工学院学报 2004年第2期17卷 39-42页

作者：王奇刘信安重庆大学化学化工学院重庆400044

利用Cygwin,将Linux和Unix操作系统下的量子化学并行计算程序移植到运行Windows操作系统的集群环境中,实现了Windows集群中的量子化学并行计算。文章给出了具体的移植实例和计算实例。

关键词：并行计算 gamess Cygwin 集群