Improving Energy Consumption Of Java Programs

Information and Communications Technologies (ICT) amounts for 10% of the world energy which will keep on growing in the future and 3% of the overall carbon footprint which is now more than the level of CO2 emission as that of the aviation industry. For many past years, the focus was on hardware to optimize the energy consumption of ICT systems. This includes dynamic adaptation of hardware techniques such as fine-grain clock gating, power gating, and dynamic voltage/frequency scaling. However, recent demands of exascale computation, as well as the increasing carbon footprint, require new breakthroughs to make ICT systems more energy-efficient. This is not possible by only making the hardware energy-efficient. As a result, the focus is shifting on software now. Software is one of the most critical bottlenecks while trying to optimize the energy consumption of any ICT system. Software energy consumption can be optimized in several ways like choosing the energy-efficient option in a programming language, using an energy-efficient programming language or choosing an energy-efficient compiling option. In this work, we concentrate on the energy-efficient options and command-line options to optimize software energy consumption. Today’s programming languages provide software developers with several options to perform the same task. For example, in Java, an Array can be copied to other Array either manually or using Java methods. However, not every option available is energy-efficient and the software developers lack the knowledge to choose the best energy-efficient option. We perform various analyses to decide on choosing the best option for different components of Java programming language. These components include data types, operators, control statements, String, exceptions, objects, and Arrays. Java has different command-line options that can be used to tune the JVM. These options can significantly affect the energy behavior of Java applications. We conduct a comprehensive study to evaluate the energy efficiency of Java command-line options. We first stabilize the idle energy consumption of two ICT systems and then evaluate the active energy consumption of SPECjvm2008 benchmarks using different JDKs (Open and Oracle) and Java command-line options. The Java command-line options include client, server, Xbatch, Xcomp, Xfuture, Xint, Xmixed, Xrs, AggressiveOpts, AggressiveHeap, Inline, AlwaysPreTouch, Xnoclassgc, UseSerialGC, UseParallelGC, UseConcMarkSweepGC, and UseG1GC. Next, we present Java Energy Profiler and Optimizer (JEPO) tool to help software developers to write energy-efficient code. This tool is an Eclipse IDE plugin and provides energy efficiency suggestions for Java programming language. It can provide suggestions dynamically while writing code or statically to refactor already written code. For providing suggestions, it analyzes each line of Java file and matches it to the pool of suggestions. JEPO can also help the software developers to automatically measure energy consumption at method granularity to determine the energy-hungry Java methods in software. We hope our findings and tool can help software developers to write energy-efficient code in the future

Fiscal policyfor managing Indonesia's environment

The objective of this paper is to examine the role of fiscal policy in the management of Indonesia's environment. The aim is to develop a framework that will allow an examination of possible fiscal instruments and their relevance to Indonesia's context. It is important to note that fiscal policy is one possible area of policy intervention. Regulatory policies would also continue to play a major role. A comprehensive environmental management strategy will need to be based on a balanced combination of regulatory and fiscal policy instruments. Furthermore, a critical element underlying the successful implementation of this strategy will be the availability of an appropriate institutional mechanism. The paper provides an overview of Indonesia's key environmental issues followed by the framework for fiscal policy instruments. The Indonesian Government's progress on environmental management policies is examined briefly to provide background for the discussion of possible fiscal policy options. Finally, the paper provides a summary and conclusions.Water Conservation,Forestry,Water Resources Assessment,Environmental Economics&Policies,Water and Industry

Evaluation of new Electricity Meters

New technologies developed (new ways of energy generation and consumption) are promoting the introduction of improvements at electricity networks. Currently, European legislation is promoting changes in electricity networks of member states. These changes include new technologies to facilitate the introduction of renewable energy sources to the grid and have a more efficient use of energy. Smart grids are able to achieve these objectives. One of the important issues at smart grids is the requirement of having good measures (to be able to control the power grid) and good communication between all the electricity market participants. Smart meters are part of the smart grid technologies and are actually useful to solve this task Smart meters have a lot of features, but the most important is the two-way communication. This really differentiates this meter and electronic meters. This Master Thesis is going to study deeply this communication to understand how it works, by developing an own program able to read the measurements taken by the meter

Motor Condition Monitoring Using Wireless Sensors

The main aim of the project is to develop a wireless system that can be integrated with an existing wired system to monitor several variables/conditions of an electric motor. The objective was to build a prototype wireless motor condition monitoring with the usage of Zigbee modules