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...s under dynamically changing workloads and isolating them from demand fluctuations in co-located virtual machines (VMs). However, despite the well-documented importance of responsiveness to end users =-=[1, 2, 3]-=-, cloud services today typically only address availability guarantees and not response-time-based service level agreements (SLAs). Virtualization techniques such as CPU capacity enforcement and VM mig...

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...t of the study is a fictitious online store.sIn such situations, user attitude may be a moresappropriate variable to study.sUser attitude has been shown to be an important and useful outcomesvariable =-=[31, 32]-=-.sJeong and Lambert [47] show that customers’ attitudes towards using a Website is asstrong indicator for predicting their purchasing behaviour.sThis is in line with the Theory or ReasonedsAction (TRA...

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...customers into the innovation process. This problem may be particularly salient with the increasing choices and sophistication of tools available for the creation of online communities. In addition to the effective design of those rating mechanisms users’ satisfaction with the website constitutes an important antecedent of successful community building. Much of the research in the HCI literature frequently excludes affective variables such as attitudes (satisfaction) from system evaluation. However, attitude measures have been used as surrogates for success at different levels of granularity (Galletta et al. 2004). The amount of satisfaction a user has with the Web site’s interface (an attitude) is seen as a dominant component of a general attitude about returning to the site and thus for successful community building (Cyr et al. 2009; Galletta et al. 2004). Extending previous decision management research, we focus on analyzing effective idea rating and selection mechanisms in online innovation communities and underlying explanations. This research seeks to advance knowledge about the effective and efficient utilization of information technology for the improvement of online innovation portals. To gain...

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...for a web site. An additional hour added to a batch job, which normally takes a year, may not be noticed. While research has been done to examine the wait times that most Internet users will tolerate =-=[14,26]-=-, none of these studies specifically addressed security explanations for these delays. Behavioral Economics, Usability, and Soft Paternalism. Our contribution can be related to the nascent literature ...

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... data centers and provide web-accessible services ranging from e-commerce to communication. Such services are often crucially dependent on quick response times to keep users satisfied. Recent studies =-=[10, 6, 2]-=- and the experiences of large operators [9] have Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not...

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...s are necessary [6, 9]. However, for less interactive tasks (e.g. reading email, searching the web, or downloading a document), acceptable response times anywhere from 1-16 seconds have been reported =-=[5, 11, 4, 7]-=-. There is a some evidence that for less interactive tasks, standards are becoming more demanding as web users become more savvy and broadband penetration increases [7]. User perception of latency for...

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...ountermeasures to adopt to limit its diffusion. Performance and effectiveness in order to make the tools longer used by users, since excessive delays involve an abandonment by users after first use =-=[9]-=-. NoTrace, a Mozilla Firefox add-on included in the Privacy & Security Category of the Mozilla Community12, relies on a modular architecture. This modularity represents the key factor to provide measu...

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...ecifically, we can view this as a problem of selecting a subset of high utility objects from the original website that can be rendered within some load time budget for user tolerance (say 2–5 seconds =-=[18, 19]-=-). We can then either block or de-prioritize the loads of low utility objects to reduce user-perceived page load times [9]. While this approach sounds intuitively appealing, there are three high-level...

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...act on user behavior on the site, Figure 13 shows how the average number of clicks decreases as load and consequently, response time increases. This is consistent with previous works on user behavior =-=[7]-=-, [21]. V. RESOURCE CONSUMPTION Figure 14 shows resource consumption distribution across anonymized applications. When modeling sessions and requests they also have different characteristics and resou...