cloudcomputing provides a new paradigm for industries to meet the emerging business needs by accessing distributedcomputing resources such as infrastructure, hardware and software applications on-demand over the int...
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ISBN:
(纸本)9781467329255;9781467329224
cloudcomputing provides a new paradigm for industries to meet the emerging business needs by accessing distributedcomputing resources such as infrastructure, hardware and software applications on-demand over the internet as services. As the technology and the need is growing very fast, in future there may be multiple vendors offering different services with different Quality of Services (QoS) and at various prices. This would lead to development of new methods and tools for the performance evaluation of the system to meet the offerings and requirements. In this paper, we present an analytical finite population model for performance evaluation of a private cloudcomputing system. Various performance measures of the cloud system for finite population environment indicate that the proposed provisioning technique helps the cloud operators in tuning the resources accordingly to improve the QoS targets.
This paper presents the work of the "Scalable-Earth-System-Models for high productivity climate simulations" project in improving the linear solver of the barotropic subsystem in the global ocean/sea-ice mod...
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ISBN:
(纸本)9781905088423
This paper presents the work of the "Scalable-Earth-System-Models for high productivity climate simulations" project in improving the linear solver of the barotropic subsystem in the global ocean/sea-ice model MPIOM developed by the Max-Planck-Institute in Hamburg, Germany. We demonstrate the implementation of the conjugate gradient method and an incomplete Cholesky preconditioner with fill-in p in order to achieve high scalability and performance on an IBM POWER6 based supercomputer. Benchmarks of the new solver compared to the traditionally used Successive-Over-Relaxation-Method are given and analyzed with respect to the number of iterations and runtime.
Most general CFD Navier-Stokes software have been parallelised using standard spatial decomposition based on ghost cells and MPI. The paper presents two parallel strategies to implement an Algebraic Multigrid solver: ...
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ISBN:
(纸本)9781905088423
Most general CFD Navier-Stokes software have been parallelised using standard spatial decomposition based on ghost cells and MPI. The paper presents two parallel strategies to implement an Algebraic Multigrid solver: a standard MPI version where coarse grids are solved by all the MPI processes and an adaptive version with a 'rank merging' step where all the coarse meshes are gathered from several processes onto one processs. Scaling a linear solver onto thousands of cores is a challenge with a pure MPI approach on the new generation of processors. We outline how to introduce new level of parallelisms based on compiler directives with OpenMP, Transactional Memory and Thread Level Speculation, for Finite Volume cell-centered formulation and face-based loops.
The advancement in the fields of science, engineering, social networking and e-commerce along with the tremendous growth in the pervasive technologies has generated a tsunami of data in digital form. To store and proc...
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ISBN:
(纸本)9781538605394
The advancement in the fields of science, engineering, social networking and e-commerce along with the tremendous growth in the pervasive technologies has generated a tsunami of data in digital form. To store and process this type of data is a big challenge for the researcher. Different distributedcomputing and processing systems have been developed to overcome these real world data computational and storage problems. For such computational intensive applications, cloud or gridcomputing can be seen as a special type of distributedcomputing platform. One of the main layer used in gridcomputing environment is middleware, that divides the user job and distribute it among several available computing resources for processing and then do the result aggregation task. In this paper we have surveyed the existing popular middleware software libraries used in gridcomputing environment and presented a qualitative comparison of these systems w.r.t resource management.
We present the design, implementation and deployment of SPIDO2, a massively parallel out-Of-Core direct dense linear solver used by Boundary Element Method (BEM) codes developed at EADS InnovationWorks, and currently ...
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ISBN:
(纸本)9781905088423
We present the design, implementation and deployment of SPIDO2, a massively parallel out-Of-Core direct dense linear solver used by Boundary Element Method (BEM) codes developed at EADS InnovationWorks, and currently in production in all EADS business units. It is designed as a high performance drop-in replacement for a legacy solver, uniformly achieves very good scalability up to several hundreds cores (>= 80% of peak performance), is portable and takes into account the new context of HPC, leveraging OpenMP and MPI for intra/inter-node parallelism. We provide here a detailed analysis of the algorithms and data structures used to achieve a very efficient out-of-core parallel decomposition (LU and LDLt), including run-time complexity validating the design choices. We then describe the implementation, benchmarks and validation methodology that led to the deployment of this solver in the BEM codes, and we finally provide insights on how we expect this design to be well-suited to the current and future advances in HPC technology.
A Science Gateway is a connection between scientists and their computational tools in the form of web portal. It creates a space for communities, collaboration and data sharing and visualization in a comprehensive and...
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ISBN:
(纸本)9781905088423
A Science Gateway is a connection between scientists and their computational tools in the form of web portal. It creates a space for communities, collaboration and data sharing and visualization in a comprehensive and efficient manner. The main purpose of such a solution is to allow users to access the computational resources, process and analyze their data and get the results in a uniform and user friendly way. In this paper we propose a complex solution based on the Rich Internet Application (RIA) approach consisting of a web portal powered by Vine Toolkit with Adobe Flex / BlazeDs technologies.
The cloudcomputing is a new computing model which comes from gridcomputing, distributedcomputing, parallelcomputing, virtualization technology, utility computing and other computer technologies and it has more adv...
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SPMD parallel computation of a weakly compressible particle-laden jet flow is presented in our paper. The parallel computation is conducted with an explicit finite difference method by the direct numerical method on a...
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ISBN:
(纸本)9781905088423
SPMD parallel computation of a weakly compressible particle-laden jet flow is presented in our paper. The parallel computation is conducted with an explicit finite difference method by the direct numerical method on an IBM Linux Cluster. The conservation equations, boundary conditions, domain decomposition method, and the solving processes are carefully presented. Two-way coupled forces are used to consider the effect of the interaction between particles and fluid. The speedup factor andparallel computational efficiency are presented with different domain decomposition methods. The numerical simulation results are compared carefully with experimental data. To some extent, our DNS code is useful for large-scale particle-laden turbulent flow.
cloudcomputing which is regarded as the next revolution of science and technology is the development of distributed processing, parallelcomputing andgridcomputing. It is an Internet-based super computing model and...
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The paper presents some results of modelling continuous media problems on computer system with hybrid architecture on the basis of quasi gas dynamic (QGD) equations system. The successful experience in solving a wide ...
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ISBN:
(纸本)9781905088423
The paper presents some results of modelling continuous media problems on computer system with hybrid architecture on the basis of quasi gas dynamic (QGD) equations system. The successful experience in solving a wide variety of gas dynamic problems by means of QGD based schemes showed that they describe viscous heat conducting flows as good as schemes for Navier-Stokes equations, where the latter are applicable. The explicit scheme described here has a Courant stability condition even for very low Mach numbers. So, it is very convenient for computer systems with the hybrid architecture, in particular for GPU-based computers. parallel realization is based on shmem programming technology. The calculations results show good parallelization efficiency.
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