The article in this special section focus on telecommunications management and orchestration, focusing on software defined networks, intelligent networking, network management, and network function virtualization.
The article in this special section focus on telecommunications management and orchestration, focusing on software defined networks, intelligent networking, network management, and network function virtualization.
Galerkin’s method is analyzed for mixed initial value-boundary value problems for the following two equations: \[ \frac{{\partial u}} {{\partial t}} - \sum\limits_{i = 1}^n {\frac{\partial } {{\partial x_i }}} A_i (x...
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Galerkin’s method is analyzed for mixed initial value-boundary value problems for the following two equations: \[ \frac{{\partial u}} {{\partial t}} - \sum\limits_{i = 1}^n {\frac{\partial } {{\partial x_i }}} A_i (x,\nabla u) = f(x,t,u,\nabla u) \] and \[ \frac{{\partial ^2 u}} {{\partial t^2 }} - \sum _{i = 1}^n {\frac{\partial } {{\partial x_i }}} A_i (x,\nabla u) = f(x,t,u,\nabla u). \] Optimal order $H^1 $ and $L^2 $ convergence estimates are obtained.
The backbone of a large-scale supercomputer is the interconnection network. As compute nodes become more energy-efficient, the interconnect is accounting for an increasing proportion of the total system energy consump...
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ISBN:
(纸本)9781479956180
The backbone of a large-scale supercomputer is the interconnection network. As compute nodes become more energy-efficient, the interconnect is accounting for an increasing proportion of the total system energy consumption. The interconnect's energy consumption is, however, only starting to receive serious attention. Some hardware-based schemes have been proposed that exploit idle periods or low utilisation, either by turning off the links or by lowering the frequency and voltage. Although these schemes are effective in certain cases, they do not have enough global information about the application's communication behaviour to efficiently manage the network power consumption. This paper proposes an alternative approach: moving the intelligence into the PMPI layer of the MPI library, and using prediction to discover repetitive patterns in the application's communication behaviour. The core of the prediction algorithm is an n-gram extraction technique, which can accurately predict not only when a link will become unused but also when it will become active again, allowing lanes to be switched off during the idle periods and switched back on again in time to avoid incurring a significant performance degradation. Many HPC applications benefit from prediction, since they have repetitive computation and communication phases. By implementing the energy-saving mechanism inside the MPI library, existing MPI programs do not need to be modified. Using an event-driven simulator, driven by representative HPC workloads, we demonstrate average energy savings in Infiniband switches up to around 33%, while the average execution time increase is only up to 1%.
We consider a class of iterative algorithms for solving systems of linear equations where the coefficient matrix is nonsymmetric with positive-definite symmetric part. The algorithms are modelled after the conjugate g...
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We consider a class of iterative algorithms for solving systems of linear equations where the coefficient matrix is nonsymmetric with positive-definite symmetric part. The algorithms are modelled after the conjugate gradient method, and are well suited for large sparse systems. They do not make use of any associated symmetric problems. Convergence results and error bounds are presented.
Varied types of intercompany cooperation in handling scientific and technical information in petroleum, pharmaceutical and aerospace industries are discussed;American Petroleum Institute provides central abstracting s...
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Varied types of intercompany cooperation in handling scientific and technical information in petroleum, pharmaceutical and aerospace industries are discussed;American Petroleum Institute provides central abstracting service with information retrieval system;eight pharmaceutical firms took only few years to establish cooperative abstracting and indexing of machine searchable published material;broad aspects of aerospace abstracting are covered.
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