Improving Resource Management in Virtualized Data Centers using Application Performance Models

The rapid growth of virtualized data centers and cloud hosting services is making the management of physical resources such as CPU, memory, and I/O bandwidth in data center servers increasingly important. Server management now involves dealing with multiple dissimilar applications with varying Service-Level-Agreements (SLAs) and multiple resource dimensions. The multiplicity and diversity of resources and applications are rendering administrative tasks more complex and challenging. This thesis aimed to develop a framework and techniques that would help substantially reduce data center management complexity. We specifically addressed two crucial data center operations. First, we precisely estimated capacity requirements of client virtual machines (VMs) while renting server space in cloud environment. Second, we proposed a systematic process to efficiently allocate physical resources to hosted VMs in a data center. To realize these dual objectives, accurately capturing the effects of resource allocations on application performance is vital. The benefits of accurate application performance modeling are multifold. Cloud users can size their VMs appropriately and pay only for the resources that they need; service providers can also offer a new charging model based on the VMs performance instead of their configured sizes. As a result, clients will pay exactly for the performance they are actually experiencing; on the other hand, administrators will be able to maximize their total revenue by utilizing application performance models and SLAs. This thesis made the following contributions. First, we identified resource control parameters crucial for distributing physical resources and characterizing contention for virtualized applications in a shared hosting environment. Second, we explored several modeling techniques and confirmed the suitability of two machine learning tools, Artificial Neural Network and Support Vector Machine, to accurately model the performance of virtualized applications. Moreover, we suggested and evaluated modeling optimizations necessary to improve prediction accuracy when using these modeling tools. Third, we presented an approach to optimal VM sizing by employing the performance models we created. Finally, we proposed a revenue-driven resource allocation algorithm which maximizes the SLA-generated revenue for a data center.

Asociaciones público privadas para la infraestructura social en salud: hacia la identificación de pautas para la definición de un modelo colombiano

Las asociaciones público privadas "APP" han sido utilizadas para distribuir riesgos y fomentar el desarrollo de los países a través de la provisión de infraestructura. Así, se implementan para proveer bienes y servicios públicos tanto en los sectores de infraestructura productiva (carreteras, puertos, aeropuertos, trenes), como en el sector de infraestructura social (escuelas, universidades, hospitales, edificaciones públicas, etc.). En Colombia, ante la escasez de recursos públicos y la necesidad de formular posiibles soluciones a la crisis del sector salud, surge como una posible solución el modelo de APP consagrado en la Ley 1508 de 2008.

A Framework for Design-Time Testing of Service-Based Applications at BPEL Level

Software applications created on top of the service-oriented architecture (SOA) are increasingly popular but testing them remains a challenge. In this paper a framework named TASSA for testing the functional and non-functional behaviour of service-based applications is presented. The paper focuses on the concept of design time testing, the corresponding testing approach and architectural integration of the consisting TASSA tools. The individual TASSA tools with sample validation scenarios were already presented with a general view of their relation. This paper’s contribution is the structured testing approach, based on the integral use of the tools and their architectural integration. The framework is based on SOA principles and is composable depending on user requirements.

Dental Treatment Services Scheme (DTSS) - Service Utilisation and Treatment Need (Lot 9)

Dental Treatment Services Scheme (DTSS) – Service Utilisation and Treatment Need (Lot 9) Since 2002, following agreement between the Department of Health and Children and the GMS Payments Board, data from the DTSS payments database has been transferred routinely to the Oral Health Services Research Centre (OHSRC), in University College, Cork for analysis. Queries have been developed in the OHSRC to provide individual level data on the treatments provided to patients, such as examinations, extractions, fillings, scale and polish, removal/amputation of roots, root treatment (upper and lower anterior teeth), radiographs, partial dentures and full dentures, and also data on the characteristics of the dentist providing services. Click here to download PDF 2.4mb

Public Service Agreement 2010 - 2014 (Croke Park Agreement) - Departmental Progress Report September 2011

1. Summary of Main Progress Achieved in the Six Month Period April 2011 to September 2011 ICT services and Accounts/Finance services are being provided by the Department to the new Department of Children and Youth Affairs on an ongoing basis.A Special Delivery Unit, as provided for in the Programme for Government, is currently being established.A survey of all staff workloads is currently underway to verify that all staff are appropriately deployed and utilised.   Click here to download PDF 46KB

Public Service Agreement 2010-2014 (Croke Park Agreement) - Departmental Progress Report - May 2011

Public Service Agreement 2010-2014 (Croke Park Agreement) – Departmental Progress Report – May 2011. Click here to download PDF 106KB

Public Service Agreement 2010 - 2014 (Croke Park Agreement): Departmental Action Plan

Public Service Agreement 2010 – 2014 (Croke Park Agreement): Departmental Action Plan Click here to download PDF 33KB

Public Service Agreement - Health Sector Progress Report and Savings - May 2011

Public Service Agreement – Health Sector Progress Report and Savings – May 2011 Click here to download PDF 4.69MB

Public Service Agreement - Health Sector Progress Report - October 2011

Public Service Agreement – Health Sector Progress Report – October 2011 Click here to download PDF 7.66MB

Non-Commercial State Agencies - Public Service Agreement Progress Report - October 2011

Non-Commercial State Agencies – Public Service Agreement Progress Report – October 2011 Click here to download PDF 35KB

Public Service Agreement 2010-2014 - Health Sector Action Plan 2012

This revised Action Plan is designed to support the delivery of the HSEâ?Ts 2012 National Service Plan by facilitating the fast-tracking of measures required to deliver essential health and personal social services across the country within the context of further reductions in funding and staff numbers. The implementation of the National Service Plan, approved by the Minister for Health on 13 January 2012, represents a major challenge to the health services and comes at a time of major reform of the public health system.   Click here to download PDF 161kb

Public Service Agreement 2010-2014 (Croke Park Agreement) Integrated Departmental and Agencies Action Plan 2012

Public Service Agreement 2010-2014 (Croke Park Agreement) Integrated Departmental and Agencies Action Plan 2012 Integrated Departmental and Agencies Action Plan (Jan 2012) PDF 54kb Integrated Departmental and Agencies Action Plan (Oct 2012) PDF 194kb  

Public Service Agreement 2010-2014 (Croke Park Agreement) - Second Annual Progress, Savings and Productivity Reports for the Department and its Agencies

Public Service Agreement 2010-2014 (Croke Park Agreement) – Second Annual Progress, Savings and Productivity Reports for the Department and its Agencies Integrated Annual Progress Report for the Department and its Agencies PDF 327kb Annual Savings Report for the Department’s Agencies PDF 205kb Productivity Report for the Department and its Agencies PDF 205kb

Public Service Agreement - Revised Health Sector Action Plan - December 2012

The health service has been at the forefront in delivering significant change under the PSA. The substantial contribution already made by health service staff, especially during the period of concentrated retirements up to February 2012, is acknowledged and much appreciated by management. These changes are being achieved in what is a complex working environment with increasing demands, (500,000 increase in medical card holders between 2007 and 2012) and a growing and ageing population, within a public health service which is undergoing unprecedented organisational change and reform, accompanied by a reducing workforce. Public Service Agreement – Revised Health Sector Action Plan- December 2012 savings report Click here to download PDF 51kb

Public Service Agreement - Health Sector second annual progress and savings report

Department cover letters PDF 839kb Main health sector progress report PDF 11.1mb Traffic light document PDF 39kb Savings template PDF 268kb