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The Performance Paradox of the JVM: Why More Hardware Means More
Expert Tip The Performance Paradox of the JVM: Why More Hardware Means More As computer hardware gets cheaper and faster, administrators managing Java based servers are frequently encountering serious problems when managing their runtime environments. JVM handles the task of garbage collection for the developer - cleaning up the space a developer has allocated for objects once an instance no longer has any references pointing to it. Some garbage collection is done quickly and invisibly. But certain sanitation tasks, which fortunately occur with minimal frequency, take significantly longer, causing the JVM to pause, and raising the ire of end users and administrators alike. Read this TheServerSide.com Expert Tip to better understand the JVM performance problem, how the JVM manages memory and how best to approach JVM Performance. Sponsored By: TheServerSide.com Expert Tip The Performance Paradox of the JVM: Why More Hardware Means More Expert Tip The Performance Paradox of the JVM: Why More Hardware Means More Table of Contents The Performance Paradox of the JVM: Why More Hardware Means More Failures Resources from Azul Systems Sponsored By: Page 2 of 8 TheServerSide.com Expert Tip The Performance Paradox of the JVM: Why More Hardware Means More The Performance Paradox of the JVM: Why More Hardware Means More Failures By Cameron McKenzie The Problem of the Unpredictable Pause As computer hardware gets cheaper and faster, administrators managing Java based servers are frequently encountering serious problems when managing their runtime environments. While our servers are getting decked out with faster and faster hardware, the Java Virtual Machines (JVMs) that are running on them can't effectively leverage the extra hardware without hitting a wall and temporarily freezing. -
Android (Operating System) 1 Android (Operating System)
Android (operating system) 1 Android (operating system) Android Home screen displayed by Samsung Nexus S with Google running Android 2.3 "Gingerbread" Company / developer Google Inc., Open Handset Alliance [1] Programmed in C (core), C++ (some third-party libraries), Java (UI) Working state Current [2] Source model Free and open source software (3.0 is currently in closed development) Initial release 21 October 2008 Latest stable release Tablets: [3] 3.0.1 (Honeycomb) Phones: [3] 2.3.3 (Gingerbread) / 24 February 2011 [4] Supported platforms ARM, MIPS, Power, x86 Kernel type Monolithic, modified Linux kernel Default user interface Graphical [5] License Apache 2.0, Linux kernel patches are under GPL v2 Official website [www.android.com www.android.com] Android is a software stack for mobile devices that includes an operating system, middleware and key applications.[6] [7] Google Inc. purchased the initial developer of the software, Android Inc., in 2005.[8] Android's mobile operating system is based on a modified version of the Linux kernel. Google and other members of the Open Handset Alliance collaborated on Android's development and release.[9] [10] The Android Open Source Project (AOSP) is tasked with the maintenance and further development of Android.[11] The Android operating system is the world's best-selling Smartphone platform.[12] [13] Android has a large community of developers writing applications ("apps") that extend the functionality of the devices. There are currently over 150,000 apps available for Android.[14] [15] Android Market is the online app store run by Google, though apps can also be downloaded from third-party sites. -
Sun Ultratm 5 Workstation Just the Facts
Sun UltraTM 5 Workstation Just the Facts Copyrights 1999 Sun Microsystems, Inc. All Rights Reserved. Sun, Sun Microsystems, the Sun logo, Ultra, PGX, PGX24, Solaris, Sun Enterprise, SunClient, UltraComputing, Catalyst, SunPCi, OpenWindows, PGX32, VIS, Java, JDK, XGL, XIL, Java 3D, SunVTS, ShowMe, ShowMe TV, SunForum, Java WorkShop, Java Studio, AnswerBook, AnswerBook2, Sun Enterprise SyMON, Solstice, Solstice AutoClient, ShowMe How, SunCD, SunCD 2Plus, Sun StorEdge, SunButtons, SunDials, SunMicrophone, SunFDDI, SunLink, SunHSI, SunATM, SLC, ELC, IPC, IPX, SunSpectrum, JavaStation, SunSpectrum Platinum, SunSpectrum Gold, SunSpectrum Silver, SunSpectrum Bronze, SunVIP, SunSolve, and SunSolve EarlyNotifier are trademarks, registered trademarks, or service marks of Sun Microsystems, Inc. in the United States and other countries. All SPARC trademarks are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the United States and other countries. Products bearing SPARC trademarks are based upon an architecture developed by Sun Microsystems, Inc. UNIX is a registered trademark in the United States and other countries, exclusively licensed through X/Open Company, Ltd. OpenGL is a registered trademark of Silicon Graphics, Inc. Display PostScript and PostScript are trademarks of Adobe Systems, Incorporated, which may be registered in certain jurisdictions. Netscape is a trademark of Netscape Communications Corporation. DLT is claimed as a trademark of Quantum Corporation in the United States and other countries. Just the Facts May 1999 Positioning The Sun UltraTM 5 Workstation Figure 1. The Ultra 5 workstation The Sun UltraTM 5 workstation is an entry-level workstation based upon the 333- and 360-MHz UltraSPARCTM-IIi processors. The Ultra 5 is Sun’s lowest-priced workstation, designed to meet the needs of price-sensitive and volume-purchase customers in the personal workstation market without sacrificing performance. -
Java (Programming Langua a (Programming Language)
Java (programming language) From Wikipedia, the free encyclopedialopedia "Java language" redirects here. For the natural language from the Indonesian island of Java, see Javanese language. Not to be confused with JavaScript. Java multi-paradigm: object-oriented, structured, imperative, Paradigm(s) functional, generic, reflective, concurrent James Gosling and Designed by Sun Microsystems Developer Oracle Corporation Appeared in 1995[1] Java Standard Edition 8 Update Stable release 5 (1.8.0_5) / April 15, 2014; 2 months ago Static, strong, safe, nominative, Typing discipline manifest Major OpenJDK, many others implementations Dialects Generic Java, Pizza Ada 83, C++, C#,[2] Eiffel,[3] Generic Java, Mesa,[4] Modula- Influenced by 3,[5] Oberon,[6] Objective-C,[7] UCSD Pascal,[8][9] Smalltalk Ada 2005, BeanShell, C#, Clojure, D, ECMAScript, Influenced Groovy, J#, JavaScript, Kotlin, PHP, Python, Scala, Seed7, Vala Implementation C and C++ language OS Cross-platform (multi-platform) GNU General Public License, License Java CommuniCommunity Process Filename .java , .class, .jar extension(s) Website For Java Developers Java Programming at Wikibooks Java is a computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few impimplementation dependencies as possible.ble. It is intended to let application developers "write once, run ananywhere" (WORA), meaning that code that runs on one platform does not need to be recompiled to rurun on another. Java applications ns are typically compiled to bytecode (class file) that can run on anany Java virtual machine (JVM)) regardless of computer architecture. Java is, as of 2014, one of tthe most popular programming ng languages in use, particularly for client-server web applications, witwith a reported 9 million developers.[10][11] Java was originallyy developed by James Gosling at Sun Microsystems (which has since merged into Oracle Corporation) and released in 1995 as a core component of Sun Microsystems'Micros Java platform. -
Cost-Effective Compilation Techniques for Java Just-In-Time Compilers 3
IEICE TRANS. ??, VOL.Exx–??, NO.xx XXXX 200x 1 PAPER Cost-Effective Compilation Techniques for Java Just-in-Time Compilers Kazuyuki SHUDO†, Satoshi SEKIGUCHI†, Nonmembers, and Yoichi MURAOKA ††, Fel low SUMMARY Java Just-in-Time compilers have to satisfy a policies. number of requirements in conflict with each other. Effective execution of a generated code is not the only requirement, but 1. Ease of use as a base of researches. compilation time, memory consumption and compliance with the 2. Cost-effective development. Less labor and rela- Java Virtual Machine specification are also important. We have tively much effect. developed a Java Just-in-Time compiler keeping implementation 3. Adequate quality and performance for practical labor little. Another important objective is developing an ad- equate base of following researches which utilize this compiler. use. The proposed compilation techniques take low compilation cost and low development cost. This paper also describes optimization Compiler development involves much work on a methods implemented in the compiler, for instance, instruction parser, intermediate representations and a number of folding, exception handling with signals and code patching. optimizations. Because of it, we have to consider those key words: Runtime compilation, Java Virtual Machine, Stack human and engineering factor seriously in addition to caching, Instruction folding, Code patching technical requirements like performance. Our plan on the development of the JIT compiler was to have a prac- 1. Introduction tical compiler with work several man-month. Our an- other goal was specifically having a research base on Just-in-Time (JIT) compilers for Java bytecode have which we do following researches with less labor while to satisfy a number of requirements, which are differ- developing it with less work. -
Kernel Boot-Time Tracing
Kernel Boot-time Tracing Linux Plumbers Conference 2019 - Tracing Track Masami Hiramatsu <[email protected]> Linaro, Ltd. Speaker Masami Hiramatsu - Working for Linaro and Linaro members - Tech Lead for a Landing team - Maintainer of Kprobes and related tracing features/tools Why Kernel Boot-time Tracing? Debug and analyze boot time errors and performance issues - Measure performance statistics of kernel boot - Analyze driver init failure - Debug boot up process - Continuously tracing from boot time etc. What We Have There are already many ftrace options on kernel command line ● Setup options (trace_options=) ● Output to printk (tp_printk) ● Enable events (trace_events=) ● Enable tracers (ftrace=) ● Filtering (ftrace_filter=,ftrace_notrace=,ftrace_graph_filter=,ftrace_graph_notrace=) ● Add kprobe events (kprobe_events=) ● And other options (alloc_snapshot, traceoff_on_warning, ...) See Documentation/admin-guide/kernel-parameters.txt Example of Kernel Cmdline Parameters In grub.conf linux /boot/vmlinuz-5.1 root=UUID=5a026bbb-6a58-4c23-9814-5b1c99b82338 ro quiet splash tp_printk trace_options=”sym-addr” trace_clock=global ftrace_dump_on_oops trace_buf_size=1M trace_event=”initcall:*,irq:*,exceptions:*” kprobe_event=”p:kprobes/myevent foofunction $arg1 $arg2;p:kprobes/myevent2 barfunction %ax” What Issues? Size limitation ● kernel cmdline size is small (< 256bytes) ● A half of the cmdline is used for normal boot Only partial features supported ● ftrace has too complex features for single command line ● per-event filters/actions, instances, histograms. Solutions? 1. Use initramfs - Too late for kernel boot time tracing 2. Expand kernel cmdline - It is not easy to write down complex tracing options on bootloader (Single line options is too simple) 3. Reuse structured boot time data (Devicetree) - Well documented, structured data -> V1 & V2 series based on this. Boot-time Trace: V1 and V2 series V1 and V2 series posted at June. -
History and Evolution of the Android OS
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Springer - Publisher Connector CHAPTER 1 History and Evolution of the Android OS I’m going to destroy Android, because it’s a stolen product. I’m willing to go thermonuclear war on this. —Steve Jobs, Apple Inc. Android, Inc. started with a clear mission by its creators. According to Andy Rubin, one of Android’s founders, Android Inc. was to develop “smarter mobile devices that are more aware of its owner’s location and preferences.” Rubin further stated, “If people are smart, that information starts getting aggregated into consumer products.” The year was 2003 and the location was Palo Alto, California. This was the year Android was born. While Android, Inc. started operations secretly, today the entire world knows about Android. It is no secret that Android is an operating system (OS) for modern day smartphones, tablets, and soon-to-be laptops, but what exactly does that mean? What did Android used to look like? How has it gotten where it is today? All of these questions and more will be answered in this brief chapter. Origins Android first appeared on the technology radar in 2005 when Google, the multibillion- dollar technology company, purchased Android, Inc. At the time, not much was known about Android and what Google intended on doing with it. Information was sparse until 2007, when Google announced the world’s first truly open platform for mobile devices. The First Distribution of Android On November 5, 2007, a press release from the Open Handset Alliance set the stage for the future of the Android platform. -
An Application Programming Interface for the MORSE Simulator
Bachelor’s Thesis Czech Technical University in Prague Faculty of Electrical Engineering F3 Department of Control Engineering An application programming interface for the MORSE simulator Lukáš Bertl Cybernetics and Robotics: Systems and Control [email protected] January 2017 Supervisor: RNDr. Miroslav Kulich, Ph.D. Acknowledgement / Declaration I would like to express my gratitude to I hereby declare that I have complet- my supervisor RNDr. Miroslav Kulich, ed this thesis with the topic ”An ap- Ph.D. for a great mentorship, patience plication programming interface for the and wise comments that helped me com- MORSE simulator” independently and plete this project. that I have listed all sources of informa- I would like to thank my girlfriend tion used within it in accordance with and my parents for their unlimited men- the methodical instructions for observ- tal support throughout my whole stud- ing the ethical principles in the prepara- ies. tion of university theses. Finally, I thank my brother and Kač- In Prague, January ...., 2017 ka Janatková for the proofreading of this thesis. ........................................ Lukáš Bertl iii Abstrakt / Abstract Práce představuje CCMorse, což je Thesis presents the CCMorse, a simu- knihovna pro komunikaci se simuláto- lator communication library, that I have rem, kterou jsem vytvořil. Práce dále created. The thesis also describes the popisuje proces vývoje simulačního pro development process of a MORSE sim- simulátor MORSE. ulation environment. Teze probírá nejprve teorii robotic- The thesis -
LIST of NOSQL DATABASES [Currently 150]
Your Ultimate Guide to the Non - Relational Universe! [the best selected nosql link Archive in the web] ...never miss a conceptual article again... News Feed covering all changes here! NoSQL DEFINITION: Next Generation Databases mostly addressing some of the points: being non-relational, distributed, open-source and horizontally scalable. The original intention has been modern web-scale databases. The movement began early 2009 and is growing rapidly. Often more characteristics apply such as: schema-free, easy replication support, simple API, eventually consistent / BASE (not ACID), a huge amount of data and more. So the misleading term "nosql" (the community now translates it mostly with "not only sql") should be seen as an alias to something like the definition above. [based on 7 sources, 14 constructive feedback emails (thanks!) and 1 disliking comment . Agree / Disagree? Tell me so! By the way: this is a strong definition and it is out there here since 2009!] LIST OF NOSQL DATABASES [currently 150] Core NoSQL Systems: [Mostly originated out of a Web 2.0 need] Wide Column Store / Column Families Hadoop / HBase API: Java / any writer, Protocol: any write call, Query Method: MapReduce Java / any exec, Replication: HDFS Replication, Written in: Java, Concurrency: ?, Misc: Links: 3 Books [1, 2, 3] Cassandra massively scalable, partitioned row store, masterless architecture, linear scale performance, no single points of failure, read/write support across multiple data centers & cloud availability zones. API / Query Method: CQL and Thrift, replication: peer-to-peer, written in: Java, Concurrency: tunable consistency, Misc: built-in data compression, MapReduce support, primary/secondary indexes, security features. -
John Parr: RF: Did You Ever Get the Feeling That You Were Swimming Upstream in Your Home Country?
JP: Well, I left school at fifteen. I worked in a factory. But I was still playing in bands. I really turned professional at nineteen. RF: What kind of music were you playing at nineteen? JP: A mixture of ... well, basically hits. English hits and American things. RF: Who would you consider to have been your influences when you were getting started? I'm one of those people who doesn't believe absolutely that Britain leads the way musically. JP: The Beatles and Elvis and Cliff Richard were the influences that got me to start playing. RF: Would you say if you went back and listened to tapes that might have been made during that era that you sounded more like one of those then any of the others? JP: I think we probably sounded like a cross between The Monkees and The Beatles if you could imagine that RF: I think there was a similarity there anyway. Did any of the mates you were playing with then go on to brilliant solo careers? JP: Ummm ... I couldn't say people I was playing with, but I think people who saw me perform. You see, in Northern England, although I never made it on a national scale, there were a lot of bands that later went on to make it who used to come and watch me play. Bands like Saxon, would come and watch my band play. Let me think ... Def Leppard, Human League, ABC, people like that. They were lesser bands in Northern England when we were kind of a top band. -
Flexible Modular Robotic Simulation Environment for Research and Education
FLEXIBLE MODULAR ROBOTIC SIMULATION ENVIRONMENT FOR RESEARCH AND EDUCATION Dennis Krupke∗, Guoyuan Li and Jianwei Zhang Houxiang Zhang and Hans Petter Hildre Department of Computer Science Faculty of Maritime Technology and Operations University of Hamburg Aalesund University College Email: f3krupke, li, [email protected] Email: fhozh, [email protected] ∗corresponding author knowledge there is no special purpose simulation soft- ware for modular robots that allows for fast and easy cre- KEYWORDS ation of a simulation setup while being easy to use and easy to understand. Modular robots control, educational software, Open- A modular robot GUI has been developed that enables RAVE, interactive simulation the user to focus on robotics while most of the program- ming part is hidden. This idea is also described in (Zhang ABSTRACT et al., 2006). In contrast to other powerful systems only In this paper a novel GUI for a modular robots simula- few rules have to be learned for proper use of our sys- tion environment is introduced. The GUI is intended to tem. Motivation is the most important aspect for peo- be used by unexperienced users that take part in an edu- ple who have just begun with something new to proceed cational workshop as well as by experienced researchers and succeed. The GUI enables the user to get results who want to work on the topic of control algorithms of very quickly because only some basic knowledge about modular robots with the help of a framework. It offers the application space of modular robotics is needed. This two modes for the two kinds of users. -
Implementarea Rețelelor Ad-Hoc Pe Platforme Android
UNIVERSITATEA “TRANSILVANIA” DIN BRAŞOV DEPARTAMENTUL DE ELECTRONICĂ ŞI CALCULATOARE Programul de studii: Tehnologii şi sisteme de telecomunicaţii Implementarea rețelelor Ad-Hoc pe platforme Android Absolvent: TERZA Balázs-László Indrumător: Şef lucrări dr.ing. SIMON Csaba BRAŞOV 2015 Universitatea Transilvania din Braşov Tehnologii şi Sisteme de Telecomunicaţii Facultatea de Inginerie Electrică şi Ştiinţa Calculatoarelor 2015 Universitatea Transilvania din Braşov Lucrare de diplomă nr. .......... Facultatea Inginerie Electrică şi Ştiinţa Calculatoarelor Departamentul Viza facultăţii Electronică şi Calculatoare Programul de studii Anul universitar Tehnologii şi sisteme de telecomunicaţii 2014 - 2015 Candidat Promoţia TERZA Balázs-László 2015 Cadrul didactic îndrumător Ș.l. dr. ing. SIMON Csaba LUCRARE DE DIPLOMĂ Titlul lucrării: Implementarea reţelelor Ad-Hoc pe platforme Android Problemele principale tratate: 1. Prezentarea generală a sistemului de operare Android 2. Prezentarea modului de comunicatii ad hoc 3. Proiectarea şi dezvoltarea aplicaţiei pentru sistemul Android 4. Testarea şi masurarea parametrilor QoS pe reteaua configurata de absolvent Locul şi durata practicii: Laboratoarele de electronică (112-113) al Universităţii Sapientia, Mai 2014 - Iunie 2015 Bibliografie: 1. Reto Meier: Professional Android 4 Application Development, Wrox, 2012 2. A. Tanenbaum, D.J. Wetherall: Számítógép hálózatok, Panem, 2012 Aspecte particulare: Primit tema la data de: 15.05.2014 Data predării lucrării: 30.06.2015 Director departament, Cadru didactic