A PERFORMANCE EVALUATION OF THE NEHALEM QUAD-CORE PROCESSOR FOR SCIENTIFIC COMPUTING

2008 ◽  
Vol 18 (04) ◽  
pp. 453-469 ◽  
Author(s):  
KEVIN J. BARKER ◽  
KEI DAVIS ◽  
ADOLFY HOISIE ◽  
DARREN J. KERBYSON ◽  
MIKE LANG ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Large Scale ◽  
Scientific Computing ◽  
First Generation ◽  
Second Generation ◽  
Building Blocks ◽  
Simultaneous Multithreading ◽  
Scientific Applications ◽  
Memory Controller ◽  
A Performance

In this work we present an initial performance evaluation of Intel's latest, second-generation quad-core processor, Nehalem, and provide a comparison to first-generation AMD and Intel quad-core processors Barcelona and Tigerton. Nehalem is the first Intel processor to implement a NUMA architecture incorporating QuickPath Interconnect for interconnecting processors within a node, and the first to incorporate an integrated memory controller. We evaluate the suitability of these processors in quad-socket compute nodes as building blocks for large-scale scientific computing clusters. Our analysis of intra-processor and intra-node scalability of microbenchmarks, and a range of large-scale scientific applications, indicates that quad-core processors can deliver an improvement in performance of up to 4x over a single core depending on the workload being processed. However, scalability can be less when considering a full node. We show that Nehalem outperforms Barcelona on memory-intensive codes by a factor of two for a Nehalem node with 8 cores and a Barcelona node containing 16 cores. Further optimizations are possible with Nehalem, including the use of Simultaneous Multithreading, which improves the performance of some applications by up to 50%.

scholarly journals A Performance Evaluation of the Cray X1 for Scientific Applications

2005 ◽  
pp. 51-65 ◽  
Author(s):  
Leonid Oliker ◽  
Rupak Biswas ◽  
Julian Borrill ◽  
Andrew Canning ◽  
Jonathan Carter ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Scientific Applications ◽  
A Performance

Brominated β-Alkoxyvinyl Trihalomethyl Ketones as Promising Synthons in Heterocyclic Synthesis

Synthesis ◽  
2020 ◽  
Vol 52 (14) ◽  
pp. 2008-2016
Author(s):  
Mateus Mittersteiner ◽  
Nilo Zanatta ◽  
Helio G. Bonacorso ◽  
Marcos A. P. Martins
Keyword(s):  
First Generation ◽  
Second Generation ◽  
Building Blocks ◽  
Third Generation ◽  
Cycloaddition Reactions ◽  
Heterocyclic Synthesis

5-Bromo- and 5,5-dibromo-1,1,1-trihalo-4-methoxypent-3-en-2-ones (brominated enones) have proven to be attractive building blocks for the construction of heterocyclic and polyheterocyclic compounds bearing a trihalomethyl moiety through interesting cyclocondensation, alkylation, and cycloaddition reactions. This review compiles all of the reactions conducted with these brominated enones since they were first disclosed in 2001.1 Introduction2 Synthesis and Initial Applications3 Synthesis Using First-Generation Intermediates4 Synthesis Using Second-Generation Intermediates5 Synthesis Using Third-Generation Intermediates6 Conclusions

Estimating the overhead and coupling of scientific computing clusters

SIMULATION ◽  
2021 ◽  
pp. 003754972110641
Author(s):  
Aurelio Vivas ◽  
Harold Castro
Keyword(s):  
High Performance ◽  
Scientific Computing ◽  
Virtual Machines ◽  
Building Blocks ◽  
Scientific Applications ◽  
Computing Systems ◽  
The Third ◽  
Cluster Of Workstations ◽  
Computer Aided ◽  
Performance Computing

Since simulation became the third pillar of scientific research, several forms of computers have become available to drive computer aided simulations, and nowadays, clusters are the most popular type of computers supporting these tasks. For instance, cluster settings, such as the so-called supercomputers, cluster of workstations (COW), cluster of desktops (COD), and cluster of virtual machines (COV) have been considered in literature to embrace a variety of scientific applications. However, those scientific applications categorized as high-performance computing (HPC) are conceptually restricted to be addressed only by supercomputers. In this aspect, we introduce the notions of cluster overhead and cluster coupling to assess the capacity of non-HPC systems to handle HPC applications. We also compare the cluster overhead with an existing measure of overhead in computing systems, the total parallel overhead, to explain the correctness of our methodology. The evaluation of capacity considers the seven dwarfs of scientific computing, which are well-known, scientific computing building blocks considered in the development of HPC applications. The evaluation of these building blocks provides insights regarding the strengths and weaknesses of non-HPC systems to deal with future HPC applications developed with one or a combination of these algorithmic building blocks.

scholarly journals The Development of a Second-Generation of Controlled Diffusion Airfoils for Multistage Compressors

1985 ◽  
Author(s):  
R. F. Behlke
Keyword(s):  
Large Scale ◽  
First Generation ◽  
Second Generation ◽  
Flow Region ◽  
Operating Conditions ◽  
Design Model ◽  
Controlled Diffusion ◽  
Significant Performance ◽  
Multistage Compressors ◽  
High Mach

The evolution of Controlled Diffusion Airfoils is traced from inception of the theoretical design model to demonstration of significant performance gains at engine operating conditions in a multistage compressor rig. The proven aerodynamic benefits and versatility of first-generation Controlled Diffusion Airfoil blade elements are extended to the endwall flow region using an Integrated Core/Endwall Vortex design model to produce a new full span optimized second-generation Controlled Diffusion design. Highlighted are the essential roles of extensive cascade, low speed, large scale and high Mach number compressor rig testing in developing and substantiating the second generation Controlled Diffusion technology resulting in a 1.5% increase in efficiency and 30% increase in surge-free operation relative to first-generation Controlled Diffusion Airfoils.

The Development of a Second Generation of Controlled Diffusion Airfoils for Multistage Compressors

1986 ◽  
Vol 108 (1) ◽  
pp. 32-40 ◽  
Author(s):  
R. F. Behlke
Keyword(s):  
Large Scale ◽  
First Generation ◽  
Second Generation ◽  
Flow Region ◽  
Operating Conditions ◽  
Design Model ◽  
Controlled Diffusion ◽  
Percent Increase ◽  
Significant Performance ◽  
High Mach

The evolution of Controlled Diffusion Airfoils is traced from inception of the theoretical design model to demonstration of significant performance gains at engine operating conditions in a multistage compressor rig. The proven aerodynamic benefits and versatility of first-generation Controlled Diffusion Airfoil blade elements are extended to the endwall flow region using an Integrated Core/Endwall Vortex design model to produce a new full-span optimized second-generation Controlled Diffusion design. Highlighted are the essential roles of extensive cascade, low-speed, large-scale, and high Mach number compressor rig testing in developing and substantiating the second-generation Controlled Diffusion technology resulting in a 1.5 percent increase in efficiency and 30 percent increase in surge-free operation relative to first-generation Controlled Diffusion Airfoils.

scholarly journals Transitioning from a First Generation to Second Generation Large-Scale Agile Development Method: Towards Understanding Implications for Coordination

2020 ◽  
pp. 84-91
Author(s):  
Finn Olav Bjørnson ◽  
Torgeir Dingsøyr
Keyword(s):  
Large Scale ◽  
First Generation ◽  
Second Generation ◽  
Development Project ◽  
Agile Development ◽  
Public Organization ◽  
Longitudinal Case Study ◽  
Development Method ◽  
Development Methodology

Abstract This paper reports our initial findings from a longitudinal case study within a large development project in a public organization in Scandinavia. We focus on changes in coordination practices as the development project moved from a 1st to a 2nd generation large-scale agile development methodology. Building on four theories of coordination from different fields, we investigate how each theory illuminates our case and what insight they might provide. We find that two of the theories are well suited to characterizing each phase, providing answer to how coordination was done. While two other theories can provide answers to why these changes occurred.

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