HotTopiCS '14Pub Date : 2014-03-22DOI: 10.1145/2649563.2649577
Rima Al Ali, I. Gerostathopoulos, I. Gonzalez-Herrera, Adrian Juan Verdejo, M. Kit, Bholanathsingh Surajbali
{"title":"An Architecture-Based Approach for Compute-Intensive Pervasive Systems in Dynamic Environments","authors":"Rima Al Ali, I. Gerostathopoulos, I. Gonzalez-Herrera, Adrian Juan Verdejo, M. Kit, Bholanathsingh Surajbali","doi":"10.1145/2649563.2649577","DOIUrl":"https://doi.org/10.1145/2649563.2649577","url":null,"abstract":"Distributed systems have continued to evolve and we note two important trends: the dramatically increasing level of dynamism in contemporary distributed systems and the convergence of mobile computing with cloud computing. The end result is that it is very difficult to achieve the required level of scalability and dependability in a systematic way when considering pervasive systems that are software- and compute-intensive and whose functionality is typically augmented by static cloud infrastructure resources. This work discusses relevant challenges and requirements for integrating cloud computing with pervasive systems operating in dynamic environments. We present a set of requirements using a holistic case study and describe a framework approach to address these requirements.","PeriodicalId":328985,"journal":{"name":"HotTopiCS '14","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121502105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
HotTopiCS '14Pub Date : 2014-03-22DOI: 10.1145/2649563.2649573
Sebastian Lehrig
{"title":"Applying Architectural Templates for Design-Time Scalability and Elasticity Analyses of SaaS Applications","authors":"Sebastian Lehrig","doi":"10.1145/2649563.2649573","DOIUrl":"https://doi.org/10.1145/2649563.2649573","url":null,"abstract":"Software architects plan, model, and analyze architectures of large software like Software-as-a-Service (SaaS) applications. The scalability and elasticity of these applications is crucially impacted by architects' early decision for an architectural style. However, whether this decision fostered scalability and elasticity can currently only be tested with the final application deployed in the target cloud computing environment. This process leads to the high risk of unsatisfying scalability/elasticity and expensive re-implementations.\u0000 To tackle this problem, we propose scalability/elasticity analyses using the architectural template (AT) language, a constraint language to specify templates (based on architectural styles) of component models for early quality analyses. This work-in-progress paper provides a first formalization of the AT language and investigates its applicability to analyze the scalability and elasticity of SaaS applications at early design-time by using a 3-tier example scenario. Our results indicate the language is applicable to such 3-tier scenarios.","PeriodicalId":328985,"journal":{"name":"HotTopiCS '14","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123538584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
HotTopiCS '14Pub Date : 2014-03-22DOI: 10.1145/2649563.2649571
Andreas Weber, N. Herbst, Henning Groenda, Samuel Kounev
{"title":"Towards a Resource Elasticity Benchmark for Cloud Environments","authors":"Andreas Weber, N. Herbst, Henning Groenda, Samuel Kounev","doi":"10.1145/2649563.2649571","DOIUrl":"https://doi.org/10.1145/2649563.2649571","url":null,"abstract":"Auto-scaling features offered by today's cloud infrastructures provide increased flexibility especially for customers that experience high variations in the load intensity over time. However, auto-scaling features introduce new system quality attributes when considering their accuracy, timing, and boundaries. Therefore, distinguishing between different offerings has become a complex task, as it is not yet supported by reliable metrics and measurement approaches. In this paper, we discuss shortcomings of existing approaches for measuring and evaluating elastic behavior and propose a novel benchmark methodology specifically designed for evaluating the elasticity aspects of modern cloud platforms. The benchmark is based on open workloads with realistic load variation profiles that are calibrated to induce identical resource demand variations independent of the underlying hardware performance. Furthermore, we propose new metrics that capture the accuracy of resource allocations and de-allocations, as well as the timing aspects of an auto-scaling mechanism explicitly.","PeriodicalId":328985,"journal":{"name":"HotTopiCS '14","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124391922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
HotTopiCS '14Pub Date : 2014-03-22DOI: 10.1145/2649563.2649575
Rouven Krebs, P. Schneider, N. Herbst
{"title":"Optimization Method for Request Admission Control to Guarantee Performance Isolation","authors":"Rouven Krebs, P. Schneider, N. Herbst","doi":"10.1145/2649563.2649575","DOIUrl":"https://doi.org/10.1145/2649563.2649575","url":null,"abstract":"Software-as-a-Service (SaaS) often shares one single application instance among different tenants to reduce costs. However, sharing potentially leads to undesired influence from one tenant onto the performance observed by the others. Furthermore, providing one tenant additional resources to support its increasing demands without increasing the performance of tenants who do not pay for it is a major challenge. The application intentionally does not manage hardware resources, and the OS is not aware of application level entities like tenants. Thus, it is difficult to control the performance of different tenants to keep them isolated. These problems gain importance as performance is one of the major obstacles for cloud customers. Existing work applies request based admission control mechanisms like a weighted round robin with an individual queue for each tenant to control the share guaranteed for a tenant. However, the computation of the concrete weights for such an admission control is still challenging. In this paper, we present a fitness function and optimization approach reflecting various requirements from this field to compute proper weights with the goal to ensure an isolated performance as foundation to scale on a tenants basis.","PeriodicalId":328985,"journal":{"name":"HotTopiCS '14","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133720364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Network traffic optimization architecture for scalability in academic inter-cloud computing environments","authors":"Shigetoshi Yokoyama, Atsushi Matsumoto, Nobukazu Yoshioka","doi":"10.1145/2649563.2649572","DOIUrl":"https://doi.org/10.1145/2649563.2649572","url":null,"abstract":"In academic inter-cloud environments, virtual machines communicate with other virtual machines in different virtual L2 network segments through a virtual router. As virtual routers are deployed on certain physical machines, communication between virtual machines via virtual routers could not be an optimal in physical sense. We are proposing an academic inter-cloud architecture (AIC) [1] which consists of AIC compute and AIC storage. AIC is a hub of clouds and it provides compute physical resource on-demand for each cloud. It means that AIC provides extension to the clouds. The clouds meet in AIC. In that sense, the virtual machines in each cloud are physically close. However, the communication between virtual machines which are located in different clouds has another level optimization problem. The communication between the virtual machines is through the gateways of each cloud. The latency cloud be much smaller if we can optimize the route. For cloud scalability we may provide bare metal servers at geographically distributed manner but the network latency should be optimized by application requirements. We propose an architecture to solve these issues which has L3 function delegation mechanism to open flow switches to reduce network latency according to users' requirements for short cuts.","PeriodicalId":328985,"journal":{"name":"HotTopiCS '14","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123468753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}