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| | Overview of the IBM Java Just-in-Time Compiler |
 | | compiler to apply other loop optimizations in the future, because the array exception checking and the array of array implementation for multidimensional arrays in Java are considered two major factors preventing the application of traditional loop optimizations and thus slowing down the execution of loops. | | | Finally we report on the performance of the IBM JIT compiler, showing both the effectiveness of the individual optimizations and the competitive overall performance of the JIT compiler in comparison with a competitor, using industry-standard benchmarking programs. | | | compiler by optimizing the original bytecode sequences and applying various code generation techniques, such as method inlining, loop versioning, fast type inclusion testing, and others, while keeping the original program semantics. |
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http://www.research.ibm.com/journal/sj/391/suganuma.html
(8038 words)
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| | [No title] |
| | Instead of compiling and optimizing one source file at a time, you compile and optimize across all of the source and header files at once. | | | For example, register allocation is an optimization in which the JIT optimizer attempts to map variables to registers; registers are what the actual hardware uses as operands to perform arithmetic and logical operations. | | | The second part involves the MSIL being fed to the just-in-time (JIT) compiler or NGEN, which reads the MSIL and then generates optimized native machine code. |
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http://msdn.microsoft.com/msdnmag/issues/05/01/COptimizations/default.aspx
(4048 words)
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| | David Notario's WebLog - CLR and JIT Compiler : The CLR x86 JIT, an overview |
| | I'll be doing a series of articles on how the x86 CLR JIT compiler works and the different optimizations it does for you. | | | Importing: In this stage, the input IL is transformed to the JIT's internal representation. | | | Simple, quick question: According to the times it takes for the JIT engine to emit a method, what is better: many small methods (these stages occur more often and the optimizations are scarse) or few large methods (these stages occur fewer times, but optimizations are heavier)? |
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http://blogs.msdn.com/davidnotario/archive/2004/10/26/247792.aspx
(1194 words)
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| | Todo - Mono |
| | Mono is an excellent platform for research on JITs, virtual machines and specifically the CLR because it provides an advanced free software implementation that can be used as a basis for more optimizations, new approaches to problems and new features. | | | These optimizations could be a lot more complex than what the JIT compiler can do today doing things like loop unrolling or processing a file to automatically multithread some pieces of the program. | | | An optimizer that could perform some tasks before the JIT compiler hits the code would be useful. |
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http://www.mono-project.com/Todo
(1327 words)
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| | Raymond Lewallen : Performance Monitoring - JIT compilations |
| | This allows the JIT to create native code that is optimal for the machine the code is running on. | | | Execution of machine level code only is all that will be required from now on. | | | Total # of IL Bytes Jitted – This counter displays the total IL bytes jitted since the start of the application. |
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http://codebetter.com/blogs/raymond.lewallen/archive/2005/05/05/62809.aspx
(984 words)
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| | RELEASE NOTES - Java Development Kit(TM) 1.1.8_005 for SCO(R) Operating Systems |
| | The bytecode optimizer is a particular part of the JIT; suppressing it may be useful for pinpointing the source of performance problems or other JIT problems. | | | This is not a bug in the JVM or the JIT -- the bug is in the application native method or the SCO system library that is doing the bad pointer dereference, and the UDK debugger stack trace on the core file will show that. | | | A bytecode optimizer that has been added to the JIT compiler, thereby improving its performance. |
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http://www.sco.com/developers/java/jdk118/ReleaseNotes.html
(7187 words)
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| | Java JIT compiler publications |
| | Kazuaki Ishizaki, Motohiro Kawahito, Toshiaki Yasue, Mikio Takeuchi, Takeshi Ogasawara, Toshio Suganuma, Tamiya Onodera, Hideaki Komatsu, and Toshio Nakatani, "Design, Implementation, and Evaluation of Optimizations in a Just-In-Time Compiler," 1999 ACM JavaGrande Conference, June 12-14, 1999. | | | Toshio Suganuma, Takeshi Ogasawara, Kiyokuni Kawachiya, Mikio Takeuchi, Kazuaki Ishizaki, Akira Koseki, Tatsushi Inagaki, Toshiaki Yasue, Motohiro Kawahito, Tamiya Onodera, Hideaki Komatsu, and Toshio Nakatani, "Evolution of a Java just-in-time compiler for IA-32 platforms," IBM Journal of Research and Development, IBM Research in Asia Issue, Vol. | | | Toshio Suganuma, Toshiaki Yasue, Motohiro Kawahito, Hideaki Komatsu, and Toshio Nakatani, "Design and evaluation of dynamic optimizations for a Java just-in-time compiler," ACM Transactions on Programming Languages and Systems (TOPLAS), Vol. |
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http://www.research.ibm.com/trl/projects/jit/pub_int.htm
(1002 words)
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| | just-in-time compiler - a Whatis.com definition - see also: JIT |
| | In the Java programming language and environment, a just-in-time (JIT) compiler is a program that turns Java bytecode (a program that contains instructions that must be interpreted) into instructions that can be sent directly to the processor. | | | After you've written a Java program, the source language statements are compiled by the Java compiler into bytecode rather than into code that contains instructions that match a particular hardware platform's processor (for example, an Intel Pentium microprocessor or an IBM System/390 processor). | | | In the past, most programs written in any language have had to be recompiled, and sometimes, rewritten for each computer platform. |
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http://whatis.techtarget.com/definition/0,,sid9_gci212423,00.html
(353 words)
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| | Psyco - Introduction |
| | The difference with the traditional approach to JIT compilers is that Psyco writes several version of the same blocks (a block is a bit of a function), which are optimized by being specialized to some kinds of variables (a "kind" can mean a type, but it is more general). | | | In extreme cases, when all computations can be done in advance, nothing remains to be done at run-time. | | | This is for example how Java JITs work -- although modern JITs use many more advanced techniques on top of that. |
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http://psyco.sourceforge.net/introduction.html
(881 words)
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| | International Conference on Supercomputing workshops |
| | Finally, we briefly mention some speculative optimizations that are well-suited to dynamic compilation e.g., optimization of methods with respect to the (dynamic) extant class hierarchy, specialization of methods with respect to data values, and optimistic assumptions about exceptions. | | | We describe algorithms for pointer-induced alias analysis for Java that are more precise and efficient than corresponding algorithms for C/C++, and we discuss two key optimizations for Java --- synchronization optimization and stack allocation of heap data --- that use the results of pointer-induced alias analysis. | | | The growing popularity of Java has led to a great deal of interest in using it for numerically intensive computing, even though it was not originally intended for applications in that domain. |
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http://www.csrd.uiuc.edu/ics99/tut1p.html
(1033 words)
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| | Just-in-time compilation - Wikipedia, the free encyclopedia |
| | Dynamic translation was pioneered by the commercial Smalltalk implementation currently known as VisualWorks, in the early 1980s. | | | The bytecode is then interpreted, or run on a virtual machine. | | | In computing, just-in-time compilation (JIT), also known as dynamic translation, is a technique for improving the performance of bytecode-compiled programming systems, by translating bytecode into native machine code at runtime. |
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http://en.wikipedia.org/wiki/Just-in-time_compilation
(494 words)
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| | JIT Compilation and Performance |
| | And, of course, Microsoft is working quite hard at improving the CLR and its JIT compiler so that it runs faster, produces more optimized code, and uses memory more efficiently. | | | If any of the attributes don't match then the NGen'd file cannot be used and the normal JIT compiler process is used instead. | | | By contrast, an unmanaged compiler and linker emit native CPU instructions that contain memory addresses when building the resulting file. |
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http://www.developer.com/net/print.php/1366921
(1122 words)
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| | Department of Computer Science |
| | In this section we discuss how to set up your environment to use Java, how to use the JIT compiler, and how to know the current JDK version. | | | If all is well, the program should run and you should see the "Hello World!" string as output. | | | This file will be interpreted by the Java interpreter. |
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http://csc.uis.edu/lager/java.html
(503 words)
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| | Citations: A Free Virtual Machine to Run Java Code - Wilkinson, --- (ResearchIndex) |
| | as the JIT compiler and implements the optimizations in a relatively machine independent manner so that it can run Java programs on multiple architectures (such as i386 or sparc) 2 OVERVIEW OF ARRAY TRANSFORMATIONS Array transformations change the layout of array elements in memory to increase. | | | ....and transitivity for a user object provides the compiler with more information to perform useful optimizations. | | | In the current implementation of Briki [5] the same optimizations are performed while recovering only as much structure as needed and using faster analysis techniques than those used in traditional compilers. |
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http://citeseer.ist.psu.edu/context/425990/0
(1339 words)
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| | David Notario's WebLog - CLR and JIT Compiler |
| | Examples of some of the processor specific optimizations in x86 (none of these will be a big surprise for developers that do machine level programming, all of these optimizations are called out in big fonts in the processor optimization manuals). | | | The CLR Optimization service tries hard to do work in the background, having 2, 4 or 8 compilations happen at the same time multiplies by 2, 4 or 8 the memory/CPU/I/O resources we would need. | | | However, the value might be retained in the internal representation for future use, if it is reloaded from the storage location without having been modified. |
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http://blogs.msdn.com/davidnotario
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| | Module Documentation - HTML::Template::JIT 0.02 |
| | The resulting compiled template should use less memory than a normal cached template. | | | My benchmarks show HTML::Template::JIT, with a precompiled template, performing 4 to 8 times faster than HTML::Template with in cache mode. | | | HTML::Template::JIT might get better at cleaning-up after itself in a future version. |
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http://aspn.activestate.com/ASPN/CodeDoc/HTML-Template-JIT/JIT.html
(648 words)
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| | Symantec.com |
| | When using Symantec's JIT, this bytecode is turned into native x86 machine code and executed directly instead of being interpreted, resulting in a substantial performance boost. | | | Tested under the industry's critically accepted benchmarking tests, this new version clearly demonstrates why Symantec's technology is the JIT of choice for major Java ISVs and developers. | | | The combination of Symantec's Just-In-Time (JIT) compiler 3.0 and Sun's Java virtual machine implementation provides the fastest platform for running Java applications on the Win32 and Intel platforms. |
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http://securityresponse.symantec.com/press/1998/n980324b.html
(484 words)
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| | [No title] |
| | The BLIT (block transfer) method is used in graphical displays to handle the move of screen bytes for e.g., scrolling. | | | The system will usually beat a pure interpreter though. | | | The resulting system will not have code as fast as a pure compiler (which has more time and usually more code to look at while compiling). |
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http://users.vnet.net/wwake/patterns/pat9808.shtml
(469 words)
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| | Symantec Says JIT Compiler 3.0 Outpaces Competition |
| | Symantec released test scores showing that its JIT outperforms all the other JITs available today, and is over 50% faster than Microsoft's Internet Explorer 4.0 JIT. | | | Symantec's earlier version had tested at 993, and Microsoft IE4's JIT only scored 1,085. | | | A JIT compiler is one of the fundamental components of the Java Virtual Machine (JVM). |
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http://www.internetnews.com/dev-news/print.php/10_52021
(414 words)
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| | Psyco - Home Page |
| | The Linux binaries have been compiled for the recent 'glibc-2.3', although a lot of systems still have 'glibc-2.2'. | | | Fixes loading problems both on Windows and Red Hat Linux. | | | A common question I get is whether Psyco will work on 64-bit x86 architectures. |
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http://psyco.sourceforge.net
(914 words)
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| | Basilisk II JIT [Gwenole Beauchesne Wiki] |
| | The Basilisk II JIT project aims at improving the run-time performance of the emulator. | | | In technical terms, it uses dynamic recompilation techniques to translate original 680×0 code into native code (currently x86 and x86_64). | | | High performance JIT translation engine for x86 and x86_64 (AMD64, EM64T) |
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http://www.gibix.net/projects/basilisk2
(406 words)
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| | Trampolines in the Kaffe JIT Compiler |
| | The fixed trampolines I put in last year take an additional > parameter for what I call the anchor of the trampoline ("w" or `where'.) > > > In general, please always date your paper and say to which versions of the > software you're describing the information applies. | | | > > > > Abstract: Trampolines are springboards for just-in-time (JIT) compilation. | | | I think this paper will help others who are porting > > Kaffe to rapidly learn this element of Kaffe's JIT compiler. |
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http://www.kaffe.org/pipermail/kaffe/2000-March/025349.html
(477 words)
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| | Just-in-Time (JIT) Compiler |
| | After the JIT compiler translates a method, the JVM uses the method's native code instead of Java bytecode. | | | performs just-in-time (JIT) compilation on each class, translating the class to native RISC code when it is loaded. | | | The JIT compiler uses method-by-method translation; that is, it translates each method as it is loaded, rather than translating an entire class. |
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http://nonstop.compaq.com/nsswdocs/nsj/nsj_1_6/proggd/compiler.htm
(253 words)
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| | The JIT Compiler Interface Specification |
| | This document specifies the JIT Compiler Interface for JDK 1.0.2. | | | The document itself is entitled "The Java Native Code API," and is intended for all programmers who are writing native code generators or other utilities that run inside the Java Virtual Machine. |
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http://java.sun.com/docs/jit_interface.html
(87 words)
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| | CACAO 0.93 - JIT Compiler |
| | The CACAO JIT compiler for Java project has relased version 0.93 with major feature enhancements. | | | Your use of this web site or any of its content or software indicates your agreement to be bound by these Terms of Participation. | | | GNU classpath has been removed; CACAO now uses upstream releases or CVS head versions." |
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http://today.java.net/pub/n/3655
(53 words)
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| | Jit Compiler question |
| | All of our stack traces say (compiled code) where the line number would be. | | | For example, the following might be the lines in your kjs script: | | | Change it to the following so that it starts with no jit option: |
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http://help.netscape.com/kb/corporate/19991022-2.html
(73 words)
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| | Java Program Does Not Run with Java JIT Compiler Enabled |
| | If the Java program runs automatically when you load the Web page after disabling Internet Explorer's Java JIT compiler, the problem may be caused by an incompatibility between the Java program and the Java JIT compiler. | | | To determine if the Java program is not running correctly, or at all, because of an incompatibility with Internet Explorer's internal Java JIT compiler, disable the internal Java JIT compiler, and then load the Web page that contains the Java program again. | | | Java Program Does Not Run with Java JIT Compiler Enabled |
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http://support.microsoft.com/support/kb/articles/q155/1/63.asp
(294 words)
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