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Topic: JIT compiler

	Chapter 8 Continued: Performance Features and Tools
		JIT compilers are supplied as standalone platform-dependent native libraries.
		When a method is called the first time the JIT compiler compiles the method block into native code for this method and stored that in the code block for that method.
		The JIT compiler does compile the whole method instead of interpreting it line by line which can also be a performance gain for when running an application with the JIT enabled.
	java.sun.com /developer/onlineTraining/Programming/JDCBook/perf2.html (2148 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.
		In a JIT environment, bytecode compilation is the first step, reducing source code to a portable and optimizable intermediate representation.
		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/Just-in-time_compilation (494 words)

	High Performance Compiler for Java
		JIT compilers turn Java bytecodes into native (object) code on-the-fly, as they are loaded into the virtual machine.
		For a JIT compiler, this recompilation is unnecessary since the layouts of instance data and instance method tables are determined at class load time, which is the same as JIT compile time.
		As can be seen, compiling to native code provides us with a speedup of between about 4 and 17 over interpreted code, and between about 3 and 13 over the JIT compiler.
	macarlo.com /ibmjavacompiler.htm (2092 words)

	[No title]
		The JIT compiler has a potential advantage over the traditional compilation technique in that it can identify the type of machine it is running on, and we make use of this information in both code generation and code scheduling.
		Also, the safe loop will allow the JIT 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.
		Since the JIT compiler is a critical component of the Jvm for achieving high performance, we will continue to improve the JIT compiler to stretch the limit of Java performance by balancing the compilation time requirement and the quality of code generation.
	www.research.ibm.com /journal/sj/391/suganuma.txt (9377 words)

	Introduction to IBM JVM for Linux JIT diagnostics
		The JIT compiled native machine code is placed into the JVM native data memory segment thus increasing native memory footprint of the JVM process, and the MMI wrapper is changed to point to the compiled code.
		These calls are placed in the JIT compiler code to assert that a required condition is true; when an assert call fails, it indicates that the JIT compiler code encountered a situation that was not anticipated.
		Often an assertion failure occurs during compilation of a failing method, whereas with the non-debug version of the JIT library, the failure may not surface until a particular instruction in the compiled method is actually executed much later.
	www-128.ibm.com /developerworks/eserver/library/es-JITDiag.html (4866 words)

	Apache Harmony - Jitrino Just-in-Time Compiler
		Jitrino compilers provide means to compile and optimize code distributed for Java* run-time environments and to adapt it to various hardware architectures.
		When the JIT compiler requests to allocate memory for an object, the memory is taken from the current arena with no system calls.
		The JIT compiler provides these functions to report locations of object references and interior pointers that are live at a given location in the JIT-compiled code.
	harmony.apache.org /subcomponents/drlvm/JIT.html (7527 words)

	Real-time Java, Part 2: Comparing compilation techniques
		So, although JIT compilation technology has been developed to the point where it can provide performance at a level comparable to or even better than static language performance, dynamic compilation is simply not the right fit for some applications.
		Compiled native methods are roughly 10 times larger than the bytecode: native code is itself less dense than the bytecodes, and the additional metadata about the code must be included so that the code can be bound into the JVM and properly executed when exceptions occur or stack traces are requested.
		Having the JIT compiler choose the methods to be compiled may or may not be an advantage, depending on how well the compiler's heuristics work in a given situation.
	www.ibm.com /developerworks/java/library/j-rtj2/index.html (5246 words)

	Working Of JIT Compiler For Java VM
		JIT compilers alter the role of the VM a little by directly compiling Java bytecode into native platform code, thereby relieving the VM of its need to manually call underlying native system services.
		The JIT compiler in turn generates native code that can be passed on to the native operating system for execution.
		When a JIT compiler is first loaded, the VM pulls a little trick with the V-table to make sure that methods are compiled into native code rather than executed.
	www.javacommerce.com /displaypage.jsp?name=jit_compiler.sql&id=18268 (551 words)

	Just-in-Time (JIT) Compiler (Site not responding. Last check: )
		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)

	Overview of the IBM Java Just-in-Time Compiler
		compiler has a potential advantage over the traditional compilation technique in that it can identify the type of machine it is running on, and we make use of this information in both code generation and code scheduling.
		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 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.
	www.research.ibm.com /journal/sj/391/suganuma.html (8038 words)

	Raymond Lewallen : Performance Monitoring - JIT compilations
		The reason for this is so that the IL code can be compiled to native code by the Just In Time (JIT) compiler on the fly, based on the machine the code is executing on.
		This allows the JIT to create native code that is optimal for the machine the code is running on.
		A JIT compilation phase is the phase when a method and its dependencies are being compiled.
	codebetter.com /blogs/raymond.lewallen/archive/2005/05/05/62809.aspx (984 words)

	RELEASE NOTES - Java Development Kit(TM) 1.1.8_005 for SCO(R) Operating Systems
		Thus, a JIT compiler is a run-time component, not a development component (as conventional language compilers are).
		By default, this JIT compiler compiles or inlines every method in the program, the first time the method is invoked (except for a few primordial methods which cannot be compiled until the JIT compiler itself is loaded).
		All JIT compilers come with a trade-off: the cost of the time it takes to stop execution of a method and do the compilation to machine code (once per method per program) versus the benefit of the time saved by subsequent invocations of that method running as machine code rather than being interpreted.
	www.sco.com /developers/java/jdk118/ReleaseNotes.html (7187 words)

	Compiling MSIL to Native Code
		JIT compilation converts MSIL to native code on demand at application run time, when the contents of an assembly are loaded and executed.
		When a method is called for the first time, the stub passes control to the JIT compiler, which converts the MSIL for that method into native code and modifies the stub to point directly to the generated native code.
		Because the JIT compiler converts an assembly's MSIL to native code when individual methods defined in that assembly are called, it necessarily involves a performance hit at run time.
	msdn.microsoft.com /en-us/library/ht8ecch6.aspx (715 words)

	Steven Pratschner's .Net CF WebLog : The Design of the .Net Compact Framework CLR, Part II: JIT Compiler Design ...
		The primary design difference, at least with respect to memory usage, between the.Net Compact Framework JIT compilers and those on the full.Net Framework is the ability to free jitted code and return memory to the operating system during times of memory pressure.
		As a program is executing, the jit compiler allocates memory in its heap to store the native code for each method as it is compiled.
		The need to jit compile the IL code for these assemblies when the application starts is eliminated by using the previously generated native code stored in the native image.
	blogs.msdn.com /stevenpr/archive/2005/12/12/502978.aspx (1238 words)

	Department of Computer Science
		CLASSPATH is the variable used by the java compiler and interpreter to know where to look for compiled classes.
		Contrary to the "javac" compiler, the JIT compiler actually compiles the class into native machine code and runs the machine code.
		We have installed the Sun-Solaris version of the JIT compiler in both csc and copihue.
	csc.uis.edu /lager/java.html (503 words)

	Mixed compilation model
		Because of the run-time overheads JIT compilation incurs and less efficient optimizations it employs, it is not recommended to use JIT for classes that are known at compile time.
		Note: If the optimizing JIT compiler fails to compile a method due to lack of memory or inability to restore the method’s structure suitable for optimizations, which may be caused e.g.
		The problem, however, is that the dynamic compiler is a scaled down version of the main, ahead-of-time JET compiler and, therefore, performs weaker optimizations in exchange for substantially lower resource demands during on-the-fly compilation.
	www.excelsior-usa.com /doc/jet370/jetw012.html (2973 words)

	JIT Compiler: Really fast POVRay FPU
		Actually, the just-in-time compilation of the function code is no really new idea: The PPC/MacOS version of POVRay already comes with a built-in JIT compiler which compiles POV VM code directly into PPC instructions without the help of external programs such as GCC.
		However, it is far easier to compile the POV VM code into a PPC RISC code with a number of general purpose FP registers than to translate into i387 FPU code (which has a register stack of size 8).
		The JIT compiler uses the same flags and directories as were used to build POVRay; this information is statically compiled into POVRay during build of the patched version.
	www.triplespark.net /render/povray/patches/jitc-patch (1381 words)

	Todo - Mono
		JIT compiler: tasks can be: adding more optimizations, reducing compile time, porting to different architectures.
		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.
		It is rumored that the MS C++ compiler produces better code than the C# compiler as it does do some IL-level loop unrolling for example.
	www.mono-project.com /Todo (1327 words)

	Oracle Database Java Application Performance
		The JIT compiler is a replacement of the compilers that were used in the earlier versions of Oracle Database.
		JIT stored compiled code avoids recompilation of Java programs across sessions or instances when it is known that semantically the Java code has not changed.
		This function compiles the method specified by name and Java type signatures defined by the class, which is identified by classname in the current schema.
	download.oracle.com /docs/cd/B28359_01/java.111/b31225/chnine.htm (1874 words)

	JIT Compilation and Performance
		In fact, I believe that JIT compiling is awesome and is capable of producing code that is more efficient and more optimized than a compiler that produces native CPU instructions.
		The JIT compiler knows precisely which CPU the user has installed in their computer causing the JIT compiler to produce native instructions that are specific to the user's machine.
		For these reasons and more, JIT compiled code is poised to be a clear performance winner when compared to unmanaged compilers and linkers.
	www.developer.com /net/print.php/1366921 (1122 words)

	GCJ: The GNU Compiler for Java - GNU Project - Free Software Foundation (FSF)
		It can compile Java source code to Java bytecode (class files) or directly to native machine code, and Java bytecode to native machine code.
		The merge changes gcj to use the Eclipse compiler as a front end, enabling all 1.5 language features.
		RMS approved the plan to use the Eclipse compiler as the new gcj front end.
	gcc.gnu.org /java (596 words)

	International Conference on Supercomputing workshops
		By compiling bytecodes into the host-machine instruction set and optimizing the code on the fly, the performance of Java applications is significantly improved, even matching the performance of statically compiled languages.
		Given that compilation takes place during the execution time of an application, JIT-compiler designers are faced with a major challenge of identifying cost effective optimizations and implementing them in an efficient manner.
		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.
	www.csrd.uiuc.edu /ics99/tut1p.html (1033 words)

	David Notario's WebLog : 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.
		Certainly, some compilers do it to remove dead code, but because IL doesnt have it, we need to recompute it.
	blogs.msdn.com /davidnotario/archive/2004/10/26/247792.aspx (1138 words)

	[No title] (Site not responding. Last check: )
		Build a compiler that compiles just before (or during) runtime to get benefits of both compilers and interpreters.
		The JIT can either compile the code all at once when it's first ready to "interpret", or it can compile classes or methods on an as-needed basis.
		In the Java world, there are pure interpreters, pure compilers, interpreter + JIT compiler, and probably other combinations as well.
	users.vnet.net /wwake/patterns/pat9808.shtml (469 words)

	The Ludicrous JIT Compiler
		Ludicrous is a just-in-time compiler for Ruby 1.8.
		When the stub method is called for the first time, the method will be compiled and the stub replaced with the compiled method.
		Method arity is likely to change when a method is compiled with Ludicrous, since arity is calculated differently for methods defined as C function pointers.
	rubystuff.org /ludicrous (500 words)

	JIT - Information about Just In Time (JIT) compiler in .NET
		The high level programming languages that need to be compiled require a runtime, so that the architecture on which the language runs is provided with details on how to execute its code.
		In.NET Framework, the intermediate language is complied "just in time" (JIT) into native code when the application or component is run instead of compiling the application at development time.
		The EconoJIT compiler compiles faster than the standard JIT compiler, but the code it produces is not as optimized as the code obtained from the standard JIT compiler.
	www.dotnet-guide.com /jit.html (361 words)

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