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Topic: Optimization of Java

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Java programming language

Optimization

	Learn more about Optimization (computer science) in the online encyclopedia. (Site not responding. Last check: 2007-10-12)
		In operations research, optimization is the problem of determining the inputs of a function that minimize or maximize its value.
		Because of that, it is preferable that optimization or performance tuning is done in the end of development stage.
		Code optimization usually starts with a rethinking of the algorithm used in the program: more often than not, a particular algorithm can be specifically tailored to a particular problem, yelding better performance than a generic algorithm.
	www.onlineencyclopedia.org /o/op/optimization__computer_science_.html (1097 words)

	Optimization of Java -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-12)
		This Optimization of Java is a collection of (The act of rendering optimal) optimization techniques used in the implementation of the (additional info and facts about Java programming language) Java programming language.
		Since the Java compiler cannot be completely sure about which method will be called before runtime due to dynamic class loading, each method call involves looking up a method in a virtual table.
		Any code sections recognized as "hotspots" by this VM will be optimized including inlining of method calls, where it can be done safely.
	www.absoluteastronomy.com /encyclopedia/o/op/optimization_of_java.htm (262 words)

	Make Java fast: Optimize!
		Optimization in Java can be an elusive target since the execution environments vary.
		It is possible to write both a Java version of a method and native versions for selected platforms; this leads to increased performance on some platforms without giving up the ability to run on all platforms.
		So the first task in optimizing code is to identify the 10 percent (frequently it is less than this) of the program that consumes most of the execution time.
	www.javaworld.com /javaworld/jw-04-1997/jw-04-optimize.html (1144 words)

	Why Java is Slow
		People who claim that Java can be as fast as C++ or even faster often base their opinion on the idea that more disciplined languages give the compiler more room for optimization.
		Java objects will be larger, due to all objects having a virtual table plus support for synchronization primitives.
		So, if a high-level optimization is to be done, there has to be a way for the programmer to specify the high-level optimization rules for the compiler.
	www.jelovic.com /articles/why_java_is_slow.htm (1733 words)

	ONJava.com: Bitwise Optimization in Java: Bitfields, Bitboards, and Beyond
		Java programmers should be even more interested in avoiding arrays than C programmers.
		Java programs are pretty far removed from the bit-crunching machines and operating systems on which they run.
		In Java, all integer primitives are in a signed number format known as "two's complement." To manipulate the primitives, we need to understand them.
	www.onjava.com /pub/a/onjava/2005/02/02/bitsets.html (1415 words)

	Java Optimization: JIT
		In the scope of this writing, several techniques will be presented to provide some generic background about 'optimization', and as an illustration, two tests were performed on three existing compilers for the observation of their behavior on different aspects of computation.
		The second optimized loop works even better since the comparison of i with len is replaced by the comparison of i with 0, so the variable len does not need to be loaded every comparison, while the comparison with 0 is prebuilt in some instructions.
		However, if the optimization techniques are so intricate as to provide the fastest executing codes, a large amount of time can be spent for compiling and loading, and it might defeat the purpose of optimization which is to reduce the execution time.
	www.cs.pdx.edu /~nbnguyen/jit.html (1691 words)

	Java Optimization Resources
		An article on optimizing Java in the April 1996 issue of Dr Dobbs Journal.
		CaffeineMark and the Java Performance Report are probably the most quoted Java benchmark and results.
		Sieve of Eratosthenes and the Plasma benchmark from Wayne Rasband.
	www.cs.cmu.edu /~jch/java/resources.html (483 words)

	CSc882 Research Paper Java Optimization and Performance (Site not responding. Last check: 2007-10-12)
		Java's development environment has more in common with native languages like C or C++ than a traditional interpreted language like BASIC.
		The designers of Java felt that it was more important to incorporate reliability (quality), maintainability and object oriented structure than raw speed.
		The Java interpreted creates a byte code file called a class file after the javac compiler is invoked on the Java source file.
	www.cs.gsu.edu /~cscrlb/csc882/node1a.html (338 words)

	Java / WebDeveloper.com ®
		The Java Language specification has a whole chapter dedicated to explaining how threads and the Java memory model works, but the implementation details of the memory model are minimal and cause a lot of confusion.
		XML Parser for Java is a validating XML parser and processor written in 100% pure Java; it is a library for parsing and generating XML documents.
		Java Web Services shows you how to use SOAP to perform remote method calls and message passing; how to use WSDL to describe the interface to a web service or understand the interface of someone else's service; and how to use UDDI to advertise (publish) and look up services in each local or global registry.
	www.webdeveloper.com /java (8782 words)

	Java Optimization (Site not responding. Last check: 2007-10-12)
		Tools: software that can help you optimize Java.
		Linpack: why the optimized version is slower under modern JITs.
		Maintainability: four sets of coding style guidelines, avoiding gray areas of the Java spec, watching for incompatible code, and using good tools.
	www.cs.cmu.edu /~jch/java/optimization.html (232 words)

	Programming:Java - Wikibooks
		If you have programmed before and would like to see a little bit of how Java works and is different from other programming languages, you can get an overview.
		Java Programming is a proposed reorganization of this module (using the recommended Wikibooks:Naming policy).
		Robocode is a game in which you program robots and make them fight each other in Java.
	en.wikibooks.org /wiki/Programming:Java (230 words)

	Optimization of Java at opensource encyclopedia (Site not responding. Last check: 2007-10-12)
		This Optimization of Java is a collection of optimization techniques used in the Java programming language.
		In Java, object creations are so expensive compared with other compiled object-oriented programming language.
		Since the Java compiler cannot be completely sure about which method will be called before runtime due to dynamic class loading, each method call involves looking up a method.
	wiki.tatet.com /Optimization_of_Java.html (258 words)

	Optimization of Java - Wikipedia, the free encyclopedia
		the theory is that if the Java compiler tries to in-line-expand one method, it must make sure that the method will not be overrided by other methods, and adding
		First, if Class X invokes a method of ClassY, the Java compiler cannot know which version of Class Y will be loaded at runtime, it cannot in-line-expand the methods regardless if they have
		Second, if a Java program runs in modern Java Virtual Machine such as Sun's HotSpot, the program's performance depends more on the "Hotspot" compiler which will rearrange the byte codes at runtime, and the JVM itself knows exactly which methods will be overrided since the methods are all loaded by itself.
	en.wikipedia.org /wiki/Optimization_of_Java (254 words)

	Optimization Java Package
		The 1-dimensional minimization routine is an unofficial Java translation of the FORTRAN version of the public domain fmin routine that can be found at www.netlib.org/go/fmin.f.
		The nonlinear least squares routines are unofficial Java translations of the FORTRAN versions of the public domain MINPACK nonlinear least squares routines that can be found at www.netlib.org/minpack.
		When Java optimization routines written by professional numerical analysts become available, they should be used.
	www1.fpl.fs.fed.us /optimization.html (812 words)

	TechOnLine - Tech Topics - Java
		The perception that current implementations of the Java specifications are either functionally incomplete, too slow, too unpredictable or too big has led some developers to shy away from implementing Java technology into their Internet appliances and embedded devices.
		This paper discusses the design and implementation of a Java execution environment (Java Virtual Machine and a selected subset of its associated core packages) targeted to embedded systems and, in particular, to set-top boxes for MPEG-2 digital TV reception.
		Two important optimizations pertaining to Java and embedded systems are emphasized: keeping the native threads stack bounded and dynamic loading and unloading of native libraries.
	www.techonline.com /community/tech_topic/java (901 words)

	Optimization
		All optimizations applied to the CFG must be defined in this package and must be derived from this class.
		The optimization requires that the CFG not be in SSA form.
		An unsafe optimization is one that will cause the generated program to be incorrect if there is aliasing.
	www-ali.cs.umass.edu /Scale/javadoc/scale/score/trans/Optimization.html (407 words)

	Java Forums - optimization of serialization
		I am working on a task that requires optimization of the deep clone operation.
		As content is written to the stream, the required size of the content is computed and (if necessary), the array is expanded to the greater of the required size or twice the current size.
		Java Object Serialization produces output that is somewhat bloated (for example, fully qualifies path names are included in uncompressed string form), so the 32 byte default starting size means that lots of small arrays are created, copied into, and thrown away as data is written.
	forum.java.sun.com /thread.jspa?threadID=631436 (341 words)

	Java Forums - Compiler Optimization
		Author: semorri_ Sep 27, 2004 1:18 PM One "feature" of the Java compiler is the lack of optimization.
		I have been told that the compiler does not optimize such code because then the JIT compiler can most efficiently optimize depending on the hardware platform.
		It is possible that you could get ideas from C optimizer logic and implement post-processing of class files (or pre-processing of bytecode).
	forum.java.sun.com /thread.jspa?threadID=558077&tstart=135 (1206 words)

	Performance Optimization for Java (Site not responding. Last check: 2007-10-12)
		When writing code in Java, there are a number of language-specific performance issues which all developers should consider.
		Java Interfaces are a great tool for providing clean designs.
		Regular Java virtual method calls are done by looking up the method stored at a constant offset into the object's Class's method table.
	ccm.redhat.com /doc/core-platform/5.0/engineering-standards/s1-performance-optimization.html (1480 words)

	Java Programming Optimization Tips (Site not responding. Last check: 2007-10-12)
		In the end after the project is completed people spends thousands of dollars trying to buy some code optimization tools and then spend more money tracing the code and fixing the performance issues.
		Here are few tips which if you follow while developing the code, it will reduce the money required to be spent on Optimization techniques, particularly useful for writing server side applications.
		Java is a trademark or registered trademark of Sun Microsystems, Inc. in the United States and other countries.
	www.javacommerce.com /displaypage.jsp?name=java_performance.sql&id=18264 (1540 words)

	Java optimization issues (Site not responding. Last check: 2007-10-12)
		I have done a few basic profiling tests on the demo using the basic Java built-in profiler and it shows that the time used in Java is about 10-20% of the overall execution time.
		Due to this fact several optimization tricks useful under classic virtual machines are in traditional compiler environments are no longer true and might even hurt performance.
		Since JGL may be released in newer version before Role Maker is fully implemented I have not done this optimization for Subproject 1, since it might result in wasted work in the long run.
	www.rolemaker.dk /documents/Subproject1/08_Phase2Impl/04_optimization.htm (494 words)

	Rely on simple design and sound logic for Java performance optimization
		Builder.com's Java e-newsletter will provide you with the insight and instruction you need to unlock the full potential of this programming language.
		A Java project is incomplete without extended discussions and arguments on optimization by the development team.
		If you are planning a performance optimization exercise after the end of coding and just before delivery, you might as well drop the idea.
	builder.com.com /5100-6389-5060690.html (675 words)

	JavaGO: Java Global Optimizer (Site not responding. Last check: 2007-10-12)
		JavaGO performs global optimization of Java byte code with assumption that it has information about all classes used in application.
		This optimization is correct only if there is a guaranty, that JavaGO is provided with complete list of all classes and no more classes can be loaded by application.
		It is also possible to optimize invocations of methods of system classes (from JDK class library).
	www.garret.ru /~knizhnik/javago/ReadMe.htm (573 words)

	Java Programming FAQs and Tutorials: Learning Java
		These are Java tutorials that give broad, but perhaps shallow, introductions to Java.
		These are Java tutorials that give deep, but perhaps narrow, coverage of specific Java programming topics.
		Java Programming Resources © 1996-2004 Marty Hall, with help from Shlomo Krasner.
	www.apl.jhu.edu /~hall/java/FAQs-and-Tutorials.html (789 words)

	Cetus Links: 16604 Links on Objects and Components / Java / General
		Java is a programming language that lets you do almost anything you can do with a traditional programming langauge like Fortran or C++.
		Platform Independent: Java programs are compiled to a byte code format that can be read and run by interpreters on many platforms including Windows 95, Windows NT, and Solaris 2.3 and later.
		Safe: Java code can be executed in an environment that prohibits it from introducing viruses, deleting or modifying files, or otherwise performing data destroying and computer crashing operations.
	www.cetus-links.org /oo_java.html (2148 words)

	[No title]
		A particularly intriguing part of the optimization exercise is the use of optimization tools.
		As Java Virtual Machines get smarter and faster, Java-based optimization is no longer as relevant as it was a few years back.
		Overall, with the emergence of J2EE and distributed applications, basic Java language-based performance tuning is no longer as big a hurdle as it was a few years back.
	builder.com.com /5102-6389-5060690.html (1007 words)

	Optimization: Building Faster Java (Site not responding. Last check: 2007-10-12)
		Although factors such as better hardware, better JVMs, and improvements to the Java language have drastically improved Java performance over the years, it still has a reputation of being slow.
		These capabilities are essential to help you tune performance, optimize memory usage, and make sure that unnecessary objects don't bog down the system by consuming too much memory.
		As we all know, when schedules get very tight, code reviews and optimization tasks are often the first casualties in the development process.
	www.oracle.com /technology/oramag/oracle/05-sep/o55opt.html (2586 words)

	Online Feedback-Directed Optimization of Java - Arnold, Hind, Ryder (ResearchIndex) (Site not responding. Last check: 2007-10-12)
		0.5: Adaptive Optimization in the Jalapeño JVM - Arnold, Fink, Grove, Hind..
		73 Adaptive optimization in the Jalapeno JVM - Arnold, Fink et al.
		5 Adaptive optimization in the Jalapeno JVM: The controller's..
	citeseer.ist.psu.edu /606966.html (856 words)

	Code Generation and Optimization
		FireStorm/DAO's generated Java provides a one-to-one mapping between Java objects and database tables, which is simpler than using a complex mapping tier.
		FireStorm/DAO Code Generation and Optimization is not limited to simple single-table operations but can also leverage the power of the relational database by generating Custom DAO classes that make use of complex SQL statements including table joins.
		Generating Java ensures that software developers are more likely to be focussed on the business requirements than the more mundane task of coding.
	www.codefutures.com /code-generation-and-optimization (619 words)

	SwTech.com - Java Code Optimization Techniques
		An experiential study by IBM describing techniques for improving the performance of Java code and enabling the development of high-throughput applications and servers in Java.
		This article gives you an understanding of Java bytecode that will enable you to be a better programmer.
		Java programmers should take the time to understand what the bytecode is, how it works, and most importantly, what bytecode is being generated by the Java compiler.
	www.swtech.com /java/optimize (297 words)

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