The Java Hot. Spot Performance Engine Architecture. Table of Contents. Introduction and Overview. The Java Hot. Spot VM Architecture.

The Java Hot. Spot Compilers. Advanced Features of the Java Hot. Spot VMImpact on Software Reusability.

Summary. Availability. Resources. Back to Top. Chapter 1. Introduction and Overview.

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The Java Hot. Spot. Java Hot. Spot technology provides the foundation for the Java SE platform, the premier solution for rapidly developing and deploying business- critical desktop and enterprise applications.

Java SE technology is available for the Solaris Operating Environment (OE), Linux, and Microsoft Windows, as well as other platforms through Java technology licensees. The Java platform has become a mainstream vehicle for software development and deployment. With millions of developers and users, the Java platform is growing explosively in many dimensions: from credit cards to wireless devices, desktops to mainframes. It is the underlying foundation for deploying Web page applets, Web services, large commercial applications, and more.

The Java Hot. Spot VM builds upon Java technology's cross- platform support and robust security model with new features and capabilities for scalability, quality, and performance. In addition to new features, this version is upward compatible with previous releases.

The Java Hot. Spot VM supports virtually all aspects of development, deployment, and management of corporate applications, and is used by: Integrated development environments (IDEs) including the Sun Java Studio Tools, the Net. Beans open source project, IBM's Eclipse, Intelli. J IDEA, Oracle JDeveloper, and others.

Application server vendors, such as the Sun Java System Application Server, BEA Systems' Web. Logic software, IBM's Web.

Sphere software, Apple Computer, Inc.'s Web. Objects software, and others.

Sun Microsystems, Inc. These improvements are applicable to both the client- and server- side Java VM environments. The Java Standard Edition Platform contains two implementations of the Java VM: Java Hot. Spot Client VM, which is tuned for best performance when running applications in a client environment by reducing application start- up time and memory footprint.

Java Hot. Spot Server VM, which is designed for maximum program execution speed for applications running in a server environment. Java Hot. Spot VM - - Built on a Solid Foundation. The Java Hot. Spot VM builds on a strong foundation of features and capabilities. An architecture supporting dynamic, object- oriented optimizations enables world- class performance. Multithreading support throughout the VM yields high scalability on even the largest computing systems available today. Advanced Reliability, Availability and Serviceability (RAS) features provide enterprise- grade reliability while enabling rapid development, introspection, and management. Chapter 2. The Java Hot.

Spot VM Architecture. Overview. The Java Hot. Spot Virtual Machine is Sun's VM for the Java platform.

It delivers the optimal performance for Java applications using many advanced techniques, incorporating a state- of- the- art memory model, garbage collector, and adaptive optimizer. It is written in a high- level, object- oriented style, and features: Uniform object model. Interpreted, compiled, and native frames all use the same stack. Preemptive multithreading based on native threads.

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Accurate generational and compacting garbage collection. Ultra- fast thread synchronization. Dynamic deoptimization and aggressive compiler optimizations. System- specific runtime routines generated at VM startup time. Compiler interface supporting parallel compilations. Run- time profiling focuses compilation effort only on .

These two solutions share the Java Hot. Spot runtime environment code base, but use different compilers that are suited to the distinctly unique performance characteristics of clients and servers. These differences include the compilation inlining policy and heap defaults.

The JDK contains both of the these systems in the distribution, so developers can choose which system they want by specifying - client or - server. Although the Server and the Client VMs are similar, the Server VM has been specially tuned to maximize peak operating speed. It is intended for executing long- running server applications, which need the fastest possible operating speed more than a fast start- up time or smaller runtime memory footprint. The Client VM compiler serves as an upgrade for both the Classic VM and the just- in- time (JIT) compilers used by previous versions of the JDK.

The Client VM offers improved run time performance for applications and applets. The Java Hot. Spot Client VM has been specially tuned to reduce application start- up time and memory footprint, making it particularly well suited for client environments. In general, the client system is better for GUIs. The Client VM compiler does not try to execute many of the more complex optimizations performed by the compiler in the Server VM, but in exchange, it requires less time to analyze and compile a piece of code. This means the Client VM can start up faster and requires a smaller memory footprint.

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The Server VM contains an advanced adaptive compiler that supports many of the same types of optimizations performed by optimizing C++ compilers, as well as some optimizations that cannot be done by traditional compilers, such as aggressive inlining across virtual method invocations. This is a competitive and performance advantage over static compilers.

Adaptive optimization technology is very flexible in its approach, and typically outperforms even advanced static analysis and compilation techniques. Both solutions deliver extremely reliable, secure, and maintainable environments to meet the demands of today's enterprise customers. Memory Model. Handleless Objects. In previous versions of the Java virtual machine, such as the Classic VM, indirect handles are used to represent object references. While this makes relocating objects easier during garbage collection, it represents a significant performance bottleneck, because accesses to the instance variables of Java programming language objects require two levels of indirection. In the Java Hot. Spot VM, no handles are used by Java code. Object references are implemented as direct pointers.

This provides C- speed access to instance variables. When an object is relocated during memory reclamation, the garbage collector is responsible for finding and updating all references to the object in place. Two- Word Object Headers. The Java Hot. Spot VM uses a two machine- word object header, as opposed to three words in the Classic VM. Since the average Java object size is small, this has a significant impact on space consumption - - saving approximately eight percent in heap size for typical applications. The first header word contains information such as the identity hash code and GC status information. The second is a reference to the object's class.

Only arrays have a third header field, for the array size. Reflective Data are Represented as Objects.

Classes, methods, and other internal reflective data are represented directly as objects on the heap (although those objects may not be directly accessible to Java technology- based programs). This not only simplifies the VM internal object model, but also allows classes to be collected by the same garbage collector used for other Java programming language objects. Native Thread Support, Including Preemption and Multiprocessing.

Per- thread method activation stacks are represented using the host operating system's stack and thread model. Both Java programming language methods and native methods share the same stack, allowing fast calls between the C and Java programming languages. Fully preemptive Java programming language threads are supported using the host operating system's thread scheduling mechanism.

Web Test Tools. How to advertiseon Softwareqatest. More than 5. 40 tools listed in 1. Organization of Web Test Tools Listing.

Note: Categories are not well- defined and some tools could have been. Web Site Management. Tools' category includes products that contain: site version. Test on demand or automate testing. Easily integrated into existing Dev stacks using their partnership.

REST API. Advanced Features include: AJAX/Web. Services, XML/JSON Data Viewer. API data/Execution.

Enables. users to stress test websites, web apps, and APIs using real browsers. Simulate globally- distributed traffic or local traffic from a single geographic location. Features. include automatic recording of test scenarios, distributed load injectors, topological and threshold.

Developed. based on fiber, a user- level thread implementation in Java. The tool is useful in scenarios where. Many existing tools are developed for scenarios with high.

HTML reports can be generated during the load to view response times. CPU, etc. Developed in Erlang.

Features a single VU license type to cover a range of. Free and $ versions available.

Can customize different. UI. Requires Win and IE. It allows you. to run simultaneous python scripts to generate load (synthetic transactions) against a web site or web service.

Can capture real production workload for. Also. available in the Amazon EC2, Rack.

Space or Plat. Form Labs cloud environments. Simulate any user scenario for webapps, websites. Launch a single dedicated server or a cluster of 1. Apache JMeter compatible - . JMeter environments with up to 1.

CPU cores and 5. 00 GB of memory. Utilizes Selenium. Access to distributed network of. Free and $ options; free low level load tests for 1- 1.

Define test cases in an. XML file - specify requests - url, method, body/payload, etc - and verifications. HTTP and HTTPS (SSL) support.

Capabilities include handling of. Ajax. Generates tests in C#. For Windows platforms. An open- source stress- testing tool for web apps; includes. User can give JCrawler a set of starting. URLs and it will begin crawling from that point onwards, going.

URLs it can find on its way and generating load on. Load parameters (hits/sec) are configurable. XML file; fires up as many threads as needed to keep load.

In contrast to other tools curl- loader is using. C- written client protocol stacks, namely, HTTP and FTP stacks of. TLS/SSL of openssl.

Advanced user journey modeling, scalable load. Coca Cola Ppt Template Download. OS independent. Orchestrate activities of a test script in many processes. Test scripts. make use of client code embodied in Java plug- ins. Most users do not. Clear and comprehensive. Supports latest technologies, including AJAX, FLEX, GWT, Java. Serialization, and more.

Capabilities. include: cookies managed natively, making the script modelling. HTML and XML parser, allowing display and. HTML page or an XML flux. APIs; more. Focus is not on implementing one. Handles. dynamic content and HTTPS/SSL; easy to use; support. These enable. testers to author, execute, and manage tests and related work. Visual Studio. Originally designed.

Web Applications but has since expanded to other test functions. Servlets, Perl scripts, Java Objects, Data Bases and Queries, FTP Servers. Can be used to simulate a heavy load on a server, network or. Reports. total number of transactions, elapsed time, bytes transferred, response. Validates. each response using plain text or regular expression searches, or by.

Full Java API. Other features: for high- performance. HTTP clients and servers, realistic traffic generation and. Based on the. Apache 1. Available via CPAN. For Windows. Modem simulation allows. For Windows, Linux, Solaris. UNIX variants. Handles HTTP and HTTPS; for Unix.

Test scripting via visual tool or Javascript with. Built- in support for Web Services/REST. SOAP, Rest, XML, JSON, Web. DAV. Can integrate with selenium. Allows prediction of behavior of e- business environment before. Also provides longer term trend analysis.

For IE, Chrome, Firefox, Safari mobile. Android Chrome. YSlow, checks one page at a time and provides.

Free and $ versions available. Page. Speed Analysis tools enable. Pc Inspector File Recovery Crack Serial Number.

Page. Speed Optimization tools can help automate the process. Includes a Performance report card, HTTP/HTML summary. JSLint. Store high- detail 5- minute checks.

View video, screenshots, logs, and. Executes test scripts on cloud machines, mobile devices.

Provides comprehensive reporting; Targeted Platforms/OS: Windows, Mac OS, IOS, and Android. Tests are written using the Selenium 2 client API. Enables automation by.

OS accessibility attributes. Like some other i.

OS test tools, uses undocumented Apple APIs, thus is appropriate. Reports on issues found and suggest mitigation approaches. Integrates with Xcode for i. OS and Eclipse for Android. Reports include device specifications. Video replay with synchronized log streaming. Can write a Python program that installs an Android application.

You can physically attach all the devices or start. Can be extended with plugins. Cross- platform, supporting Android and i. OS native apps. Provides test device cloud. Test scripts can run in parallel on hundreds.

Can run your tests locally against an emulator or. Testmunk cloud. Also includes 'Answers' kit which provides critical. Can integrate with many 3rd party bug tracking.

Requires integratiing the open source Hockey. App SDK for Android, i. OS, Mac OS X, Win. Unity, Xamarin; then uploading your app build to Hockey. App. Testers can then download and install the app and then. Your application and.

Can also run your own automation scripts. Free and $paid versions. Test cases can be easily created, without needing the. Implemented as a C++ library that can be used by other tools and applications. Multi- touch gestures, access to the physical. A small footprint.

Create objective- driven test flows by utilizing. Supports IE, Firefox, Chrome, Safari. Web. View, HTML5.

Custom actions can be created using C#, C++, JAVA, or Python. As of mid- 2. 01. Mac OS X 1. 0. 7 or higher.

Linux OK for Android- only; Win support is in . Can validate tests using internal variable values and conditionally wait for internal. Comes with rich set of test validations and object location strategies. Java. Script. Enables any mobile device. Wirelessly pair multiple i. OS and Android devices to your computer.

HTML, CSS, and Java. Script. Does not require you to jailbreak, unlock or root your device - just. The IDE includes test project management, integration. Ranorex tools (Recorder, Repository, Spy), intuitive code editor, code completion, debugging, and watch monitor. Tests are written in Objective C, allowing for maximum integration with code while minimizing. Perform side by side functional and real- user condition testing. Leverage the automation frameworks and IDEs you already use.

Selenium, Appium, UFT, Eclipse, and Visual Studio. Select your target location(s), device type(s) and OSs. Optimizer will do the rest. The test coverage grader helps build a custom mobile app test strategy.

Can integrate with Maven or Ant to run tests as part of continuous integration. It works well on Broadcast receivers, and average on Services.

For. Activities, only single Activities can be fuzzed, not all them. Instrumentations can also be started using this interface. Intent based IPC mechanism. Keynote Mobile Testing - . Cloud- based real mobile handset/tablet testing platform, from Keynote Systems, enables development. Any action that can be performed on a mobile device in- hand can be replicated on devices.

Automation capabilities provide flexible scripting that enables building of test scripts. Supports object level including native. Quickly develop scripts using GUI- based commands, Java API, other test. HP UFT, IBM Rational, Selenium, or direct support with Jenkins for continuous. Provides a unified view of mobile and. Web performance and availability. Utilizes thousands of different 'mobile devices'.

Dynatrace testing agents deployed on mobile nodes. Supports all major phone platforms such as i.

OS. Android OS, Black.