Technical Report: A Trace-Based Performance Study of Autoscaling Workloads of Workflows in Datacenters

To improve customer experience, datacenter operators offer support for simplifying application and resource management. For example, running workloads of workflows on behalf of customers is desirable, but requires increasingly more sophisticated autoscaling policies, that is, policies that dynamically provision resources for the customer. Although selecting and tuning autoscaling policies is a challenging task for datacenter operators, so far relatively few studies investigate the performance of autoscaling for workloads of workflows. Complementing previous knowledge, in this work we propose the first comprehensive performance study in the field. Using trace-based simulation, we compare state-of-the-art autoscaling policies across multiple application domains, workload arrival patterns (e.g., burstiness), and system utilization levels. We further investigate the interplay between autoscaling and regular allocation policies, and the complexity cost of autoscaling. Our quantitative study focuses not only on traditional performance metrics and on state-of-the-art elasticity metrics, but also on time- and memory-related autoscaling-complexity metrics. Our main results give strong and quantitative evidence about previously unreported operational behavior, for example, that autoscaling policies perform differently across application domains and by how much they differ.Comment: Technical Report for the CCGrid 2018 submission "A Trace-Based Performance Study of Autoscaling Workloads of Workflows in Datacenters

The psychosocial implications in young exposure to aggressive verbal stimuli evidenced by the polygraph

The objective of the study is to reveal the influence of aggressive words in physiological reactivity at polygraph.The method: the participants were 48 students at the Faculty of Psychology and Educational Science, aged between 18 and 25 years (m=21.6, S.D.=1.8). Instruments: polygraph Lafayette LX 4000 Series; audio stimuli.Results: The aggressive words had a strong impact in both galvanic skin response and hart rate recorded by polygraph.Conclusion: The young exposed to aggressive stimuli register for a short period of time a high sensorial reactivity and after, suffer a radical desensitization

A miniaturized low-power SiPM-based β detector for the ISOLDE Fast Tapestation

We report on the development of a miniaturized Silicon Photomultiplier (SiPM)-based β detector aimed as an upgrade of the newly commissioned Fast Tapestation at CERN-ISOLDE, dedicated for online radioisotope production measurements. The detector consists of a thin 3 mm plastic scintillator coupled to a custom 3 × 3 array of 6×6mm2 sized SiPM cells in a signal-driven multiplexer configuration. The preamplifier is a low power design, outputting a slow signal for energy measurements and fast signal for timing applications, both channels being equipped with adjustable gain. The whole detector fits in the available space of 30×30×30mm3

The CERN-ISOLDE fast tape station

The employment of a suitable radioactive decay spectroscopy setup is essential for the operation of radioactive ion beam (RIB) facilities. CERN-ISOLDE recently developed a new fast tape station (FTS) setup to replace its more than 40 years old predecessor. The new FTS is equipped with several β-detectors, a HPGe-detector, provisions for an α-detector, and constitutes a significant improvement in terms of transport times and detector noise characteristics. Since 2021 it is routinely used as the primary asset for yield determination and quality control of produced RIBs at ISOLDE. We address in this work its technical features and introduce the utilized control system