Articles — Project / Lab Report

Microlattice

The complete business report acts as proposal ending with a decision on whether the idea is viable or not. A positive conclusion will lead to a suggestion of further investigation within this field. Present day wind turbine faces plenty of maintenances, issues and blade failures, all these problems together are difficult to handle and thereby very costly. That is why this report aims to come up with an idea solution to detect manufacturing errors and faults before installing the wind turbine blades. This business report aims to investigate whether a Manufacturing Scanner has the ability to detect errors and faults in new wind turbine blades. In addition the business report examines if the idea based on a Net Present Value calculation along with a budget is economically beneficial. The business report includes a technical description of an x-ray scanner, materials in wind turbine blades and software detection of anomalies. A business plan is conducted to determine whether the Manufacturing Scanner is a viable business opportunity. The business plan consists of a market analysis, which includes a supply chain, positioning, pricing and customer segments, and furthermore a budget, including a Net Present Value and business case. Based on the investigated areas and the final conclusion, the idea seems viable. The scanner is possible to produce at a reasonable price, the project is economically beneficial and there is a present market potential.

Con el auge de los sistemas de bases de datos NoSQL los cuales implementan modelos de datos diferentes al relacional como son las bases de datos documentales o de grafos, ha surgido el concepto de Persistencia Políglota. Ésta sostiene que debido a la gran variedad y cantidad de representación de los datos, y los diversos servicios que pueden dar las aplicaciones hoy en día; es necesario el uso de más de un tipo de sistema de almacenamiento para ser capaz de cubrir de forma eficiente todas las necesidades de la aplicación que use dicho sistema. En este trabajo se busca dar una idea general de las Aplicaciones de Persistencia Políglota describiendo las posibles arquitecturas que hacen uso de las bases de datos NoSQL y su funcionamiento, se estudian algunos casos de éxito y se lleva a cabo un caso de estudio usando MongoDB y Neo4j.

In this document we focus on modifying the Linux Kernel through memory and scheduler parameters. The main objective is to study the performance of a computer during the execution of AIO-Stress Benchmark. It was necessary to run the test several times since three of the parameter mentioned in this project were modified 5 times. After completing the test, the results were displayed on graphs, showing that all the variables have a noticeable influence on the performance of the computer.

In this paper, we measure the memory performance throughout the Phoronix test "RAMspeed SMP". We decide to test this specific benchmark because we know how important is the memory for the system performance. This document shows how much the memory performance could change if we modify some variables in the linux kernel.

The Linux kernel controls the way tasks (or processes) are managed in the running system. The task scheduler, sometimes called process scheduler, is the part of the kernel that decides which task to run next. In this project its analyzed the behavior of scheduler by changing a default value from the runtime scheduling. The default value is 950000µs, or 0.95 seconds for the sched\_rt\_runtime\_us or scheduler realtime running variable. Meaning that 5% of the CPU time is reserved for processes that don't run under a real-time or deadline scheduling policy. This value in this file specifies how much of the "period" time can be used by all real-time and deadline scheduled processes on the system. The AIO-Stress which shows the obtained results in the different tests is an a-synchronous I/O benchmark created by SuSE which is is a German Linux distribution provider and business unit of Novell, Inc.

An attempt of achieving a Kernel optimaization using Ubuntu 16..04.1 LTS, Phoronix Test Suite and different value changes and tests for an internal Kernel variable: the runtime value.

In this paper we try to make an improvement for the Linux kernel, by modifying kernel variables.

This document talks about how we tried to do a benchmark using the aiostress test on ubuntu desktop 16.04, the things we found useful and the problems we encountered.