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Virtualization has been widely used as a key technology in cloud computing. Although facilitating the deployment of applications, virtualization introduces huge processing overheads, among which is network I/O virtualization that has become a critical bottleneck of a virtual system. DPDK-vhost is currently the fastest para-virtualized network I/O backend, however it performs poorly when exchanging...
High Performance Computing systems offer excellent metrics for speed and efficiency when using bare metal hardware, a high speed interconnect, and parallel applications. In contrast cloud computing has provided management and implementation flexibility at a cost of performance. We therefore suggest two approaches to make HPC resources available in a dynamically reconfigurable hybrid HPC/Cloud architecture...
Cloud computing is revolutionizing how organizations treat computing resources. The privileged virtual machine is a key component in systems that use virtualization, but poses a dependability risk for several reasons. The activation of residual software faults that exist in every software project is a real threat and can impact the correct operation of the entire virtualized system. To study this...
We present a framework for creating heterogeneous virtualized network function (VNF) service chains from cloud data center resources. Traditionally, these functions are packaged in software images within a catalog of networking applications that can be loaded onto a virtual machine CPU, and can be offered to users as a service. Our framework combines the best of both software and hardware by allowing...
ETSI has developed a novel Software Radio Reconfiguration framework encompassing technical, certification and security solutions. Compared to legacy Software Reconfiguration technology, such as the Software Communications Architecture, the ETSI solution is designed for lowest overall power consumption and efficiency. For this purpose, a novel approach for Code Portability has been developed — a Radio...
The computational world has become very large and complex. Cloud is an emerging technology in the world of Information Technology. Cloud computing offers IT capabilities as services. Cloud based services are on demand, scalable, device independent and reliable. Cloud computing is built on the virtualization concept. Virtualization separates hardware from software and has benefits of server consolidation...
The use of Graphics Processing Units (GPUs) has become a very popular way to accelerate the execution of many applications. However, GPUs are not exempt from side effects. For instance, GPUs are expensive devices which additionally consume a non-negligible amount of energy even when they are not performing any computation. Furthermore, most applications present low GPU utilization. To address these...
Remote DMA (RDMA) engines are widely used in clusters/data-centres to improve the performance of data transfers between applications running on different nodes of a computing system. RDMAs are today supported by most network architectures and distributed programming models. However, with the massive usage of virtualization most applications will use RDMAs from virtual machines, and the virtualization...
In this paper, we investigate the service capacity of a software-defined network with network function virtualization and service chaining. To obtain and achieve the service capacity, we formulate a mixed integer linear programming problem to jointly optimize the placement of virtual machines and the steering of network flows. In addition, we propose the greedy linear programming relaxation algorithm...
The impact of cloud computing and sharing physical resources simultaneously between several virtual instances can be crucial for the designing real-time and time-critical applications. This especially applicable to cases when the target is to deliver reliable network services. In this paper, we primarily aim at investigating the timing behavior in the cloud environments where the resources are shared...
A business owner using a cloud service desires that the service operated in the cloud system will be operated with as few hardware resources as possible while meeting the service level agreement (SLA). In this paper, we propose a method to clarify the system configuration of the minimum hardware resource that meets the desired service performance (SLA). We conducted an experiment using memcached which...
With cloud computing, the efficient management of resources is of great importance as an increased utilization of the available resources can result in higher scalability and significant energy and cost reductions. Experimental validation of novel resource management strategies is costly and time consuming, and often requires in-depth knowledge of and control over the underlying cloud platform. As...
The demands of migrating legacy on-premises IT assets to cloud dramatically increase with the wide adoption of cloud computing. Researches present automatic combination of multiple proprietary migration services offered by different vendors together to complete cloud migration. However, current cloud migration approaches are mainly basing on the direct on-premises component to cloud component mapping...
Software Defined Storage (SDS) separates the control layer from the data layer allowing the automation of data management and deployment of Commercial Off-The-Shelf (COTS) storage media rather than expensive traditional hardware-based solutions. Cloud block storage services lack an SDS framework that allows customization of block storage, policy enforcement, automate provisioning, and storage management...
One of the challenges faced by data-intensive computing is the problem of stragglers, which can significantly increase the job completion time. Various proactive and reactive straggler mitigation techniques have been developed to address the problem. The straggler identification scheme is a crucial part of the straggler mitigation techniques, as only when stragglers are detected not only correctly...
Network Function Virtualization (NFV) and Software Defined Network (SDN) are introduced to provide virtualization technology, which can tackle the deployment of network service functions in corporate networks, broadband access networks, and more recently in data centers. It is full of challenge to enhance the flexibility, efficiency and effectiveness of service function deployment. Although Service...
Live virtual machine (VM) migration is commonly used for enabling dynamic resource or fault management, or for load balancing in datacenters or cloud platforms. A service hosted by a VM may also be migrated to prevent its visibility to an external adversary who may seek to disrupt its operation by launching a DDoS attack against it. We first show that current systems cannot adequately hide a VM migration...
There is a strong industrial drive to use cloud computing technologies and concepts for providing timing sensitive services in the networking domain since it would provide the means to share the physical resources among multiple users and thus increase the elasticity and reduce the costs. In this work, we develop a mathematical model for user-stateless virtual network functions forming a forwarding...
High performance computing (HPC) systems frequently suffer errors and failures from hardware components that negatively impact the performance of jobs run on these systems. We analyzed system logs from two HPC systems at Purdue University and created statistical models for memory and hard disk errors. We created a small-scale error injection testbed—using a customized QEMU build, libvirt, and Python—that...
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