scholarly journals On the impact of advance reservations for energy-aware provisioning of bare-metal cloud resources

Author(s):  
Marcos Dias de Assuncoo ◽  
Laurent Lefevre ◽  
Francois Rossigneux
Kybernetes ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jing Zou ◽  
Cheng Jian

Purpose The present investigation goals to empirically test the role of expert cloud on team performance and employee creativity. Here, the expert cloud comprises cloud application, cloud management, cloud infrastructure and cloud resources. The present study aims to identify important and key criteria and examine the relationships among them. In other words, the purpose of this study to find out the impact and relationship between cloud application, cloud management, cloud infrastructure and cloud resources and team performance and employee creativity. Design/methodology/approach Today, human societies’ rapid growth and the environmental changes that surround us every day are clearly visible. They highly affect our activities. In today’s highly complex organizations, people alone cannot handle all the issues that have arisen. As organizational managers are faced with diverse cultures in the governance of organizations, the need to use work teams with different abilities and specializations to achieve the goals of organizations leads managers to use teamwork and focus on employee creativity. On the other hand, the expert cloud makes it possible for human societies like universities, firms, industries, institutes, businesses and colleges to pool and share their human resources’ skills, knowledge and experiences to meet the competitive era’s demands. Therefore, the current investigation examines the impact of expert cloud on team performance and employee creativity. The research information is collected using an online questionnaire. The data collected is analyzed using AMOS and SMART PLS software. Findings All of the formulated hypotheses are supported. The results have shown that cloud application, cloud management, cloud infrastructure and cloud resources positively and significantly affect team performance and employee creativity. Practical implications Managers must be conscious of the vital role that the professional cloud plays in team performance and the innovation of workers. This paper would also make executives more conscious of the powerful tools in the field of cloud computing. Firms can use the outcomes of this paper investigation to improve team performance and employee creativity. Originality/value It is considered one of the initial efforts to demonstrate the impacts of expert cloud on team performance and employee creativity. This study’s value relies on that practitioners and academics may have supporting evidence on the role played by novel technology such as an expert cloud.


Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3980 ◽  
Author(s):  
Paris Charalampou ◽  
Efstathios D. Sykas

There is a lot of effort to limit the impact of CO2 emissions from the information communication technologies (ICT) industry by reducing the energy consumption on all aspects of networking technologies. In a service provider network, data centers (DCs) are the major power consumer and considerable gains are expected by regulating the operation network devices. In this context, we developed a mixed integer programming (MIP) algorithm to optimize the power consumption of network devices via energy aware traffic engineering. We verified our approach by simulating DC network topologies and demonstrated that clear benefits can be achieved for various network sizes and traffic volumes. Our algorithm can be easily implemented as an application in the software-defined networking (SDN) paradigm, making quite feasible its deployment in a production environment.


Obiter ◽  
2017 ◽  
Vol 38 (3) ◽  
Author(s):  
Mark Tait

Literally thousands of consumer agreements are concluded every day between innkeepers and their guests. For present purposes an innkeeper is understood to be a supplier of accommodation services and, in turn, implies the proprietor of an accommodation establishment, such as a hotel, lodge and bed and breakfast establishment. It is unfortunately not uncommon that property of some consumers of accommodation services are damaged or lost through theft or other causes whilst making use of these services. As an example may serve a media report where the Daily Dispatch reported on an incident stemming from an alleged theft by employees of the Kariega Game Reserve from guests at the Reserve. This perennial problem raises the issue as to the liability of the supplier for loss of or damage to the property of the consumer whilst the latter is making use of the accommodation services of the supplier. In the praetorian edict de nautius, cauponibus et stabulariis the common law provides a specific solution as to the liability of the supplier. The edict, which is a consequence of the contract for accommodation services between the supplier and the consumer of those services, imposes strict liability on the supplier for loss of, or damage to, the property of the consumer. This protection, however, is largely negated by the general practice of expressly excluding the liability imposed by the edict in the consumer agreement between the parties.The introduction of the Consumer Protection Act 68 of 2008 (CPA) saw a number of specific provisions impacting the relationship between consumer and supplier of accommodation services – such as provisions pertaining to equality (s 8 and 9); privacy (s 11 and 12); cancellation of advance reservations (s 17); and customer loyalty programmes (s 35), to name but a few.The CPA also has implications for the supplier of accommodation services when it comes to the supplier’s liability for the loss of, or damage to, the property of the consumer. This note focuses on two particular aspects. The first considers briefly the impact of the Act on clauses excluding the liability of the supplier for loss or damage to the consumer’s property. Provisions of the CPA regulating the use of clauses excluding liability may therefore have relevance for the praetorian edict, as the protection provided by the edict is excluded as a standard practice, as stated. The edict, because of the impact of the CPA, therefore may resume its relevance of earlier years.The second aspect pertains specifically to section 65(2) of the CPA. This provision imposes a duty on suppliers in general to account for the property of the consumer when such property is in possession of the supplier. As a matter of course guests bring property into the accommodation establishment of the innkeeper with which the consumer has contracted. If such property is lost or damaged (through no fault of the consumer) the question arises whether section 65(2) can find application. If it does, it can have significant consequences for both suppliers and consumers, but if not, then an understanding of the impact of the CPA on the use of clauses in a consumer contract excluding liability becomes even more important.


2010 ◽  
Vol 56 (19) ◽  
pp. 1597-1604 ◽  
Author(s):  
Gregg W. Stone ◽  
Helen Parise ◽  
Bernhard Witzenbichler ◽  
Ajay Kirtane ◽  
Giulio Guagliumi ◽  
...  

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Ioannis Andreou ◽  
Koki Shishido ◽  
Antonios P Antoniadis ◽  
Saeko Takahashi ◽  
Masaya Tsuda ◽  
...  

Background: The natural history and the role of the atherosclerotic plaque located behind the stent (PBS) are still poorly understood. We evaluated the serial changes in PBS following bare-metal (BMS) compared with first-generation drug-eluting stent (DES) implantation and the impact of these changes on in-stent neointimal hyperplasia (NIH). Methods: 3D coronary reconstruction by angiography and intravascular ultrasound were serially performed after intervention and at 6- to 10-month follow-up in 157 Japanese patients treated with BMS (n=90) and DES (n=98; 68 sirolimus-eluting and 30 paclitaxel-eluting stents) included in the PREDICTION Study. Each reconstructed stented coronary artery was divided into consecutive 1.5-mm segments. External elastic lamina, lumen, stent, and PBS area were measured for each segment at both baseline and follow-up. At follow-up NIH area was assessed. Due to the very low rate of events in our population we used significant NIH (defined as NIH area >50% of stent area) as a binary anatomic outcome. Results: Patient, lesion, and stent characteristics were comparable between BMS and DES. There was a significant decrease in PBS area after BMS (median relative change: -7.2%, IQR -19.3 to 5.2%, p<0.001) and a significant increase after DES implantation (median relative change: 6.1%, IQR -5.7 to 20.5%, p<0.001). The decrease in PBS area significantly predicted NIH area at follow-up after controlling for baseline lumen area and baseline PBS area in both BMS (β 0.15, 95% CI 0.1 to 0.2, p<0.001) and DES (β 0.09, 95% CI 0.07 to 0.11, p<0.001). The decrease in PBS area was the most powerful predictor of significant NIH in both BMS (OR 1.13, 95% CI 1.02 to 1.26, p=0.017) and DES (OR 1.65, 95% CI 1.16 to 2.36, p=0.005). Conclusions: The PBS significantly decreased 6 to 10 months after BMS implantation, whereas after DES it increased. The decrease in PBS area was significantly associated with the development of NIH at follow-up in both stent types. These findings raise the possibility of a communication between the lesion within the stent and the underlying native atherosclerotic plaque, and may have important implications regarding the pathobiology of in-stent restenosis.


2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Bego Blanco ◽  
Ianire Taboada ◽  
Jose Oscar Fajardo ◽  
Fidel Liberal

In the context of cloud-enabled 5G radio access networks with network function virtualization capabilities, we focus on the virtual network function placement problem for a multitenant cluster of small cells that provide mobile edge computing services. Under an emerging distributed network architecture and hardware infrastructure, we employ cloud-enabled small cells that integrate microservers for virtualization execution, equipped with additional hardware appliances. We develop an energy-aware placement solution using a robust optimization approach based on service demand uncertainty in order to minimize the power consumption in the system constrained by network service latency requirements and infrastructure terms. Then, we discuss the results of the proposed placement mechanism in 5G scenarios that combine several service flavours and robust protection values. Once the impact of the service flavour and robust protection on the global power consumption of the system is analyzed, numerical results indicate that our proposal succeeds in efficiently placing the virtual network functions that compose the network services in the available hardware infrastructure while fulfilling service constraints.


2021 ◽  
Author(s):  
Peini Liu ◽  
Jordi Guitart

AbstractContainerization technology offers an appealing alternative for encapsulating and operating applications (and all their dependencies) without being constrained by the performance penalties of using Virtual Machines and, as a result, has got the interest of the High-Performance Computing (HPC) community to obtain fast, customized, portable, flexible, and reproducible deployments of their workloads. Previous work on this area has demonstrated that containerized HPC applications can exploit InfiniBand networks, but has ignored the potential of multi-container deployments which partition the processes that belong to each application into multiple containers in each host. Partitioning HPC applications has demonstrated to be useful when using virtual machines by constraining them to a single NUMA (Non-Uniform Memory Access) domain. This paper conducts a systematical study on the performance of multi-container deployments with different network fabrics and protocols, focusing especially on Infiniband networks. We analyze the impact of container granularity and its potential to exploit processor and memory affinity to improve applications’ performance. Our results show that default Singularity can achieve near bare-metal performance but does not support fine-grain multi-container deployments. Docker and Singularity-instance have similar behavior in terms of the performance of deployment schemes with different container granularity and affinity. This behavior differs for the several network fabrics and protocols, and depends as well on the application communication patterns and the message size. Moreover, deployments on Infiniband are also more impacted by the computation and memory allocation, and because of that, they can exploit the affinity better.


2018 ◽  
Vol 6 (3) ◽  
pp. 113-117 ◽  
Author(s):  
Mustafa I. Khaleel

Power consumption in datacenters has become an emerging concern for the cloud providers. This poses enormous challenges for the programmers to motivate new paradigms to enhance the efficiency of cloud resources through designing innovative energy-aware algorithms. However, balancing the weights over geographically dispersed datacenters has been shown to be essential in decreasing the temperature consumption per datacenter. In this paper, we have formulated a load balancing paradigm to exploit the idea of scheduling scientific workflows over distributed cloud resources to make system outcome more efficient. The proposed heuristic works based on three constraints. First, initiating cloud resource locality for tenants and calculating the shortest distance in order to direct module applications to the closet resources and conserving more bandwidth cost. Second, selecting the most temperature aware datacenters based on geographical climate to maintain electricity cost for the providers. Third, running multiple datacenters within the same geographical location instead of housing the entire workloads in a single datacenter. This allows providers to take a tremendous advantage of sustaining the system from degradation or even unpredictable failure which in turn will frustrate the tenants. Furthermore, applications are formulated as Directed Acyclic Graph (DAG)-structured workflow. For the underlying cloud hardware, our model groups the cloud servers to communicate as if they were in the same physical location. Additionally, both modes, on-demand and reservation, are supported in our algorithm. Finally, the simulation showed that our method was able to enhance the utilization rates about 67% compared to the baseline model.


Sign in / Sign up

Export Citation Format

Share Document