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In recent years, many database systems have been deployed in virtualized cloud platforms to take advantage of the general benefits of virtualization and cloud computing. However, deploying database systems in such environments poses some challenges that should be addressed. The performance of database systems can degrade due to the various overheads introduced by the virtualization including CPU,...
This article considers problems of distributed database structure development connected with presenting similar data in different nodes. It is suggested to use the results of users SQL-queries parsing for optimizing DB structure in order to increase local requests and synchronization speed.
Cloud Radio Access Network (C-RAN) is emerging as a transformative architecture for the next generation of mobile cellular networks. In C-RAN, the Baseband Unit (BBU) is decoupled from the Base Station (BS) and consolidated in a centralized processing center. While the potential benefits of C-RAN have been studied extensively from the theoretical perspective, there are only a few works that address...
The growing demand for flexibility and cost reduction in the telecommunication landscape directs the focus of service development heavily to programmability and softwarization. In the domain of Network Function Virtualization (NFV), one of the goals is to replace dedicated hardware devices (such as switches, routers, firewalls) with software-based network functionalities, showing comparable performance...
The large amount of data that needs to be processed, still remains one of the major hindrance toward widespread acceptance of dynamic metrics. This paper presents a live execution trace streaming based approach using platform as a service (PaaS) to overcome this hurdle. The proposed approach is the first of its type having the ability to provide the users with live dynamic coupling metric trends....
In the quest for energy efficiency of Information and Communication Technology, so far research has mostly focused on the role of hardware. However, as hardware technology becomes more sophisticated, the role of software becomes crucial. Recently, the impact of software on energy consumption has been acknowledged as significant by researchers in software engineering. In spite of that, measuring the...
File transfers over dedicated connections, supported by large parallel file systems, have become increasingly important in high-performance computing and big data workflows. It remains a challenge to achieve peak rates for such transfers due to the complexities of file I/O, host, and network transport subsystems, and equally importantly, their interactions. We present extensive measurements of disk-to-disk...
Datacenters are quickly becoming the platform of choice for modern applications. In order to understand how datacenter software utilizes the hardware and to improve future server processor performance, the authors profiled more than 20,000 Google machines over a three-year period, while serving the requests of billions of users.
Designing Wireless Sensor Networks (WSN) is tedious and time consuming process, especially WSN adoption for real-world operation. To decrease WSN design iteration count, from idea to real-world operation, specific tools must be designed. Providing end-users: with simplified WSN design procedure; with detailed information from all system layers (low to high). In this work we propose - EDI Testbed WSN...
MapReduce has become popular and Reduce-side join is one of the most important application of MapReduce. Data skew, in which the data load assigned to each Reduce task fluctuates task by task, increases the MapReduce job completion time. This paper proposes a dynamic profiling and feedback framework that works on a MapReduce cluster. The framework allows programmers to build their own algorithm to...
Personalized medicine refers to the tailoring of treatment to the individual characteristics of a patient. Part of the personalized medicine is the patient profiling and the communicative relation between physician and patient. The ways of exchanging information, the nature of the information itself and the information assimilation capabilities of the patient can assist the physicians to have a better...
Under unconsolidated resources, cloud computing providers have to allocate some resources to fullfill client request based on the on-demand mode. Using the applications profile, Infrastructure-as-a-Service model can be developed. Basically, Infrastructure-as-a-Service model provides resources in the form of computation power (CPU-hours unit), storage (gigabytes unit), network bandwidth (Internet data...
Several works in the literature have recently addressed the study of different Networked Virtual Environments (NVE) due to their increasing popularity and widespread use in fields ranging from entertainment to e-Health. Open Wonderland is one of these NVEs which has been the subject of several studies mainly focused on the client side. This paper aims to cover the server-side performance issues to...
Traditional collaborative filtering (CF) systems widely employing k-nearest neighbor (kNN) algorithms mostly attempt to alleviate the contemporary problem of information overload by generating personalized predictions for items that users might like. Unlike their popularity and extensive usage, they suffer from several problems. First, with increasing number of users and/or items, scalability becomes...
A growing class of applications, including VoIP, IM and presence, are enabled by the session initiation protocol (SIP). Requests in SIP typically traverse through multiple proxies. The availability of multiple proxies offers the flexibility to distribute proxy functionality across several nodes. In particular, after experimentally demonstrating that the resource consumption of maintaining state is...
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