Microplastics are ubiquitous in our environment but their presence in air is less well understood. Homes are likely a key source of airborne microplastics and microfibres to the environment owing to the frequent use a...
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There is growing number of research efforts in developing auto-scaling algorithms and tools for cloud resources. Traditional performance metrics such as CPU, memory and bandwidth usage for scaling up or down resources...
The term Research Software Engineer, or RSE, emerged a little over 10 years ago as a way to represent individuals working in the research community but focusing on software development. The term has been widely adopte...
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There is growing number of research efforts in developing auto-scaling algorithms and tools for cloud resources. Traditional performance metrics such as CPU, memory and bandwidth usage for scaling up or down resources...
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ISBN:
(数字)9781728132839
ISBN:
(纸本)9781728120522
There is growing number of research efforts in developing auto-scaling algorithms and tools for cloud resources. Traditional performance metrics such as CPU, memory and bandwidth usage for scaling up or down resources are not sufficient for all applications. For example, modeling and simulation experimentation is usually expected to yield results within a specific timeframe. In order to achieve this, often the quality of experiments is compromised either by restricting the parameter space to be explored or by limiting the number of replications required to give statistical confidence. In this paper, we present early stages of a deadline-based simulation experimentation framework using a micro-services auto-scaling approach. A case study of an agent-based simulation of a population physical activity behavior is used to demonstrate our framework.
Imitation learning algorithms learn viable policies by imitating an expert's behavior when reward signals are not available. Generative Adversarial Imitation Learning (GALL) is a state-of-the-art algorithm for lea...
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CFD is a ubiquitous technique central to much of computational simulation such as that required by aircraft *** of the Poisson equation occurs frequently in CFD and there are a number of possible approaches one may **...
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CFD is a ubiquitous technique central to much of computational simulation such as that required by aircraft *** of the Poisson equation occurs frequently in CFD and there are a number of possible approaches one may *** dynamical core of the MONC atmospheric model is one example of CFD which requires the solving of the Poisson equation to determine pressure *** this aspect of the model has been very time consuming and so it is important to consider how we might reduce the runtime *** this paper we survey the different approaches implemented in MONC to perform the pressure *** to take advantage of large scale,modern,HPC machines,we are concerned with the computation and communication behaviour of the available techniques and in this text we focus on direct FFT and indirect iterative *** addition to describing the implementation of these techniques we illustrate on up to 32768 processor cores of a Cray XC30 both the performance and scalability of our *** runtime is not the only measure so we also make some comments around the stability and accuracy of *** result of this work are a number of techniques,optimised for large scale HPC systems,and an understanding of which is most appropriate in different situations.
Cloud services are delivered to cloud customers on a pay-per-use model by the Cloud Services Providers (CSPs). CSP is using Service Level Agreements (SLAs) to define the quality of the provided services. Unfortunately...
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Cloud services are delivered to cloud customers on a pay-per-use model by the Cloud Services Providers (CSPs). CSP is using Service Level Agreements (SLAs) to define the quality of the provided services. Unfortunately, a standard mechanism does not exist to verify and assure that delivered services satisfy the signed SLA agreement. In this context, an automatic framework named PRESENCE was introduced to define a set of Common performance metrics handled by a set of agents within a customized client (called the Auditor) for measuring the behaviour of cloud applications on top of a given CSP. In this paper, one of the components of the PRESENCE framework dedicated to the provision of stochastic models for selected performance metrics is presented. More precisely, 11 generated models are depicted and analysed, out of which 90, 91% accurately represent Web Service (WS) performance metrics for four representatives SaaS components used for the validation of the PRESENCE approach.
Graphs are an important abstraction used in many scientific fields. With the magnitude of graph-structured data constantly increasing, effective data analytics requires efficient and scalable graph processing systems....
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ISBN:
(纸本)9781538683859
Graphs are an important abstraction used in many scientific fields. With the magnitude of graph-structured data constantly increasing, effective data analytics requires efficient and scalable graph processing systems. Although HPC systems have long been used for scientific computing, people have only recently started to assess their potential for graph processing, a workload with inherent load imbalance, lack of locality, and access irregularity. We propose ShenTu 8 the first general-purpose graph processing framework that can efficiently utilize an entire Petascale system to process multi-trillion edge graphs in seconds. ShenTu embodies four key innovations: hardware specialization, supernode routing, on-chip sorting, and degree-aware messaging, which together enable its unprecedented performance and scalability. It can traverse a record-size 70-trillion-edge graph in seconds. Furthermore, ShenTu enables the processing of a spam detection problem on a 12-trillion edge Internet graph, making it possible to identify trustworthy and spam webpages directly at the fine-grained page level.
This article's main contributions are twofold: 1) to demonstrate how to apply the general European Union's High-Level Expert Group's (EU HLEG) guidelines for trustworthy AI in practice for the domain of he...
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Since its first identification in Scotland, over 1,000 cases of unexplained paediatric hepatitis in children have been reported worldwide, including 278 cases in the UK1. Here we report an investigation of 38 cases, 6...
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