Márcio Silva

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The growth in the adoption of cloud computing is driven by distinct and clear benefits for both cloud customers and cloud providers. However, the increase in the number of cloud providers as well as in the variety of offerings from each provider has made it harder for customers to choose. At the same time, the number of options to build a cloud(More)
Memory over commitment enables cloud providers to host more virtual machines on a single physical server, exploiting spare CPU and I/O capacity when physical memory becomes the bottleneck for virtual machine deployment. However, over commiting memory can also cause noticeable application performance degradation. We present Ginkgo, a policy framework for(More)
Continuous advances in multicore and I/O technologies have caused memory to become a very valuable sharable resource that limits the number of virtual machines (VMs) that can be hosted in a single physical server. While today’s hypervisors implement a wide range of mechanisms to overcommit memory, they lack memory allocation policies and frameworks capable(More)
An increasing number of business workloads are being migrated to the cloud. Recently, cloud providers have been improving the stability and consumability of their systems and offering cost efficiency through utility-like pricing model and dynamic resilience. However, providing performance isolation and quality of services for performance-sensitive(More)
To address the challenge of automated performance benchmarking in virtualized cloud infrastructures, an extensible and adaptable framework called CloudBench has been developed to conduct scalable, controllable, and repeatable experiments in such environments. This paper presents the hardware-in-the-loop simulation technique used in CloudBench, which(More)
This paper highlights the main results obtained in an effort to improve the grammar checker CoGrOO, a hybrid system which initially annotates the text using statistical Natural Language Processing (NLP) techniques, and then apply a rule-based analysis to identify possible grammar errors. The goal was to reduce omissions and false alarms while improving true(More)
As conventional Air Traffic Control (ATC) environments transition towards the Next Generation Air Transportation System (NextGen), new tools and capabilities, such as Area Navigation (RNAV), Required Navigation Performance (RNP), data communication, Automatic Dependent SurveillanceBroadcast (ADS-B), and automated decision making tools for monitoring,(More)
Toxoplasmosis is a zoonotic disease caused by the protozoan Toxoplasma gondii. Among domestic species, the horse is one of those most resistant to T. gondii infection; however, upon acute infection, horses may present hyperirritability, poor motor coordination, ocular disorders, and abortion. Herein, we investigated the presence of antibodies against T.(More)
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