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Topic: Just In Time compilation

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  CONK! Encyclopedia: Just_in_time   (Site not responding. Last check: 2007-10-08)
Just In Time (JIT) is an inventory strategy implemented to improve the return on investment of a business by reducing in-process inventory and its associated costs.
The technique of Just In Time Programming is used as a programming method that allows to (re-)write parts of a running system.
The Just in Time philosophy was also applied other segments of the supply chain in several types of industries.
www.conk.com /search/encyclopedia.cgi?q=Just_in_time   (1459 words)

 Just-in-time compilation - Wikipedia, the free encyclopedia
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.
The goal is to combine many of the advantages of native and bytecode compilation: Much of the "heavy lifting" of parsing the original source code and performing basic optimization is handled at compile time, well prior to deployment -- compilation from bytecode to machine code is much faster than from source.
Compilers from bytecode to machine code are easier to write, because the portable bytecode compiler has already done much of the work.
en.wikipedia.org /wiki/JIT_compiler   (494 words)

 Compiler articles and news from Start Learning Now   (Site not responding. Last check: 2007-10-08)
Compilers also exist which translate from one high level language to another, or sometimes to an intermediate language that still needs further processing; these are sometimes known as cascaders.
Building a self-hosting compiler is a Bootstrappingbootstrapping problem -- the first such compiler for a language must be compiled either by a compiler written in a different language, or (as in Hart and Levin's Lisp compiler) compiled by running the compiler in an interpreter.
Compilers which are capable of producing both native and foreign binary output may be called either a cross-compiler or a native compiler depending on a specific use, although it would be more correct to classify them as a cross-compilers.
www.startlearningnow.com /Compiler.htm   (2030 words)

 Just-in-time   (Site not responding. Last check: 2007-10-08)
Although in theory a different compiler on another platform could be used on the same source code, in practice this tends to be very difficult to achieve due to differences in compilers.
There is an intermediate ground, known as p-code or bytecode, where the source code is compiled half-way at compile time and later, at run time, it is interpreted from there.
The basic idea behind a JIT is that the bytecode is smaller and easier to compile than the original source code, so that the time spent compiling it the "rest of the way" on any particular platform is quite small.
1-free-software.com /en/wikipedia/j/ju/just_in_time_1.html   (477 words)

 Overview of the IBM Java Just-in-Time Compiler
To reduce the compilation time, there is no independent single pass for the register allocation; that is, the register allocation runs synchronously with the code generation.
compiler, a class needs to be resolved at compile time as much as possible in order to obtain the addresses of methods and object fields and thus to generate better code.
compiler, we have implemented a different way of scheduling code within a basic block, running in C * n, where C is the size of the lookahead to be scheduled, in view of the compilation time constraint.
www.research.ibm.com /journal/sj/391/suganuma.html   (8038 words)

 Boosting Java Performance: Native Code & JIT Compilers
Here are timings for iterative and recursive versions of a calculator of numbers in the Fibonacci series, as well as an implementation of the Sieve of Eratosthenes, a calculator of prime numbers.
Timings are in seconds, with the C++ version compiled at the -O1 level of optimization:
Here are execution times for the same applications, this time with the addition of timings for javat-translated code.
www.disordered.org /Java-JIT.html   (2345 words)

 Development system with methods for just-in-time compilation of programs - Patent 6151703
The just-in-time compiler compiles each method of a Java program on a "just-in-time" basis--that is, it compiles each method as the method is actually used.
If the callee method is also compiled, the compiled code slot stores a pointer to a memory block which comprises the just-in-time compiled code for the method; this is an optimization which allows direct invocation of the callee method's compiled code from the caller's compiled code.
When a method is compiled, its call(s) to another (callee) method is compiled into a machine code call instruction to an address pointed to by the compiled code slot of the callee.
www.freepatentsonline.com /6151703.html   (8230 words)

 The Fastest Fourier Transform in the West   (Site not responding. Last check: 2007-10-08)
Runtime compilation, more commonly known as "just-in-time" compilation is a method of compiling programs to native code just before running it; hence the name "just-in-time".
Runtime compilation is able to maintain portability, and FFTW demonstrates this by its ability to adapt the computation to the particular hardware thereby performing faster algorithms.
Compiling programs "just-in-time" gives the ability to do so while still maintaining the characteristics of statically compiled programs and this is what appeals to developers.
www.iis.ee.ic.ac.uk /~frank/surp00/article2/is98   (1348 words)

 JIT - Just In Time
Abbreviation for "just in time." In education, just-in-time instruction is available at the time a learner needs it in order to perform a task, rather than only at the time a provider wants to make it available.
The JIT compiler translates the code when the program runs--in contrast to the all-at-once approach of a regular compiler.
Just In Time The materials management practices that minimize or eliminate the amount of product brought into inventory by setting up a delivery schedule that brings materials directly from the supplier to the production floor.
www.auditmypc.com /acronym/JIT.asp   (544 words)

 Just-in-Time Compilation
This term describes a compilation technique in which a source language (typically something like Java bytecode) is compiled to native machine code on demand.
Running times are reasonable close to those achieved by a native compiler (as good as a 25% penalty and as bad as a 200% penalty).
The resulting compiler is only compared to competitors' compilers; I would prefer to see a comparison between two compilers that only differed in the optimizations described.
www.cs.berkeley.edu /~jcondit/cs265/expert.html   (1594 words)

 just-in-time compiler - a Whatis.com definition - see also: JIT
Using the Java just-in-time compiler (really a second compiler) at the particular system platform compiles the bytecode into the particular system code (as though the program had been compiled initially on that platform).
The just-in-time compiler comes with the virtual machine and is used optionally.
It compiles the bytecode into platform-specific executable code that is immediately executed.
whatis.techtarget.com /definition/0,,sid9_gci212423,00.html   (323 words)

 Exforsys.com - VB.NET 2005 Training : The .NET Framework Architecture Part 2
As stated above, the Just in time compiler is a facility that is invoked by the CLR to convert the IL into machine code.
Since this is done just when the method needs to execute, it is called Just in time compilation.
When the JIT is invoked for the first time there is an overhead or performance penalty, since the assembly is converted into its Native code or image using the Native Image Generator (Ngen.exe).
www.exforsys.com /content/view/1456/350   (726 words)

 SE Using Java, 2nd Edition -- Chapter 39
Fortunately, existing JIT compilers compile very quickly, and even with medium size applets (3,000 lines of Java source code or 60K of bytecode), the startup time is not obviously longer with the JIT compiler than it is with the interpreter.
To minimize JIT compilation time, as many optimizations as possible should be made before the class file is generated.
Due to their longer download time, the associated graphics are usually cached blindly (for example, without checking for changes on the server) for a much longer period of time.
medialab.di.unipi.it /doc/UsingJava/39javafi.htm   (3510 words)

 Just-in-time compilation -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-08)
Bytecode is not the machine code for any particular computer, and may be portable among computer architectures.
The bytecode is then interpreted, or run on a (Click link for more info and facts about virtual machine) virtual machine.
Dynamic translation was pioneered by the commercial (Click link for more info and facts about Smalltalk) Smalltalk implementation currently known as VisualWorks, in the early (The decade from 1980 to 1989) 1980s.
www.absoluteastronomy.com /encyclopedia/J/Ju/Just-in-time_compilation.htm   (646 words)

 Efficient JavaVM Just-in-Time Compilation - Krall (ResearchIndex)   (Site not responding. Last check: 2007-10-08)
Abstract: Conventional compilers are designed for producing highly optimized code without paying much attention to compile time.
The design goals of Java just-in-time compilers are different: produce fast code at the smallest possible compile time.
...compiling each method with a fixed set of optimizations the first time it was invoked.
citeseer.ist.psu.edu /krall98efficient.html   (608 words)

 Slide Notes: Just-In-Time Compilation
Moreover, since you will need to call C procedures from within the compiled code, it may be best to bite the bullet and do it their way.
Designed for an earlier era of compilers that were bad at optimisation (although never, it turns out, bad at register allocation).
Even when the compiler is done, there will probably be a few instructions that are best done by the regular interpreter.
www.cs.usyd.edu.au /~scilect/tpop/handouts/JIT_Compilation.htm   (733 words)

 Dynamic translation : Just-in-time compilation   (Site not responding. Last check: 2007-10-08)
Dynamic translation, also known as Just-in-time compilation (JIT), is a virtual machine implementation approach, used to speed up execution of bytecode computer programs.
To execute a program unit such as a method or a function, the virtual machine compiles its bytecodes into (hardware) machine code.
The translated code is also placed in a cache, so that next time that unit's machine code can be executed immediately, without repeating the translation.
www.eurofreehost.com /ju/Just-in-time_compilation.html   (227 words)

 Just-in-Time (JIT) Compiler   (Site not responding. Last check: 2007-10-08)
The JIT compiler uses method-by-method translation; that is, it translates each method as it is loaded, rather than translating an entire class.
When the JVM runs in JIT compiler mode (with the JIT compiler), the JIT compiler translates Java bytecode to native RISC instructions and then the JVM then executes those instructions.
After the JIT compiler translates a method, the JVM uses the method's native code instead of Java bytecode.
nonstop.compaq.com /nsswdocs/nsj/nsj_1_6/proggd/compiler.htm   (253 words)

 LaTTe: A Fast and Efficient Java VM Just-in-Time Compiler   (Site not responding. Last check: 2007-10-08)
Through JIT compilation, a bytecode method is translated into a native method on the fly, so as to remove the interpretation overhead.
Since the JIT compilation itself is part of the total execution time of a Java program, it must be fast and the benefit from compilation must outweigh the JIT compilation overhead.
We are releasing this software subject to the conditions in the license agreement (which is similar to the BSD license) in the hope that a wider community may better understand our work and expand upon it for better performance and functionality.
latte.snu.ac.kr   (765 words)

 Verifying Data Flow Optimizations for Just-in-Time Compilation from Sun Microsystems White Papers at Builder UK
Annotations are often added to mobile code to reduce the optimization burden of just-in-time compilers.
However, these annotations are not checked for correctness and must be trusted - incorrect or malicious annotations could lead to the generation of incorrect or insecure code.
This paper presents a time- and space efficient method for verifying the results of the large class of data flow optimizations.
uk.builder.com /whitepapers/0,39026692,60096582p-39000959q,00.htm   (106 words)

 Absolutely Positively on Time: What Would It Take?   (Site not responding. Last check: 2007-10-08)
For example, while synchronous digital logic delivers precise timing determinacy, advances in computer architecture and software have made it difficult or impossible to estimate or predict software's execution time.
Network time synchronization methods such as IEEE 1588 provide time concurrence at nanosecond resolutions far finer than any processor or software architectures can exploit today.
With so many promising starts, the time is ripe to pull these techniques together and build 21st-century embedded computer science.
www.computer.org /portal/site/computer/menuitem.5d61c1d591162e4b0ef1bd108bcd45f3/index.jsp?&pName=computer_level1_article&TheCat=1001&path=computer/homepage/0705&file=embed.xml&xsl=article.xsl&   (1852 words)

 JUST IN TIME COMPILATION   (Site not responding. Last check: 2007-10-08)
See also Just in time for the business technique JIT is an acronym for just-in-time, a term used in the computer industry to describe a particular type of compiler system.
There is an intermediate ground, known as p-code or bytecode, where the source code is compiled "half way" and then interpreted from there.
Speed was poor however, so newer runtimes were introduced that compiled the bytecode as it was run.
www.websters-online-dictionary.org /definition/JUST+IN+TIME+COMPILATION   (424 words)

 Just-in-time compilation improvement on the Linpack 100x100 benchmark
This gives four combinations: each was run 16 times, and the results were averaged.
In some cases, the Mflop ratings varied by as much as a factor of two in these runs, so the averaging is essential.
The Java implementation in Sun Solaris 2.5 does not offer just-in-time compilation, but Solaris 2.6 does, and the effect is dramatic.
www.math.utah.edu /~beebe/java/linpack-table.html   (237 words)

 Native Image Generator (Ngen.exe) and JIT (Just In Time) Compilation - Data Mining and .NET Framework :: Community   (Site not responding. Last check: 2007-10-08)
The Common Language Runtime (CLR) uses a JIT (Just In Time) compiler to convert MSIL (Microsoft Intermediate Language) method calls to native code.
This compilaton is done the first time the method is invoked and since the compilation is done just when the method needs to execute, it is called Just In Time (JIT) compilation.
This means that their is an overhead or performance penalty associated with the first invocaton of a method in an assembly.
www.visual-basic-data-mining.net /Forum/PrintPost.aspx?PostID=293   (361 words)

 Project suggestion   (Site not responding. Last check: 2007-10-08)
JIT compilers were originally designed to achieve efficient execution of system-independent programs distributed over the Internet.
The functional language OCaml features both a byte-code compiler and a native-code compiler but not a just-in-time compiler.
The goal of this project is to extend OCaml's virtual machine with a just-in-time compiler that enable efficient execution of existing OCaml byte code programs.
www.akira.ruc.dk /~mir/Projects/jitocaml.html   (184 words)

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