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Topic: Virtual machine


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In the News (Thu 18 Apr 19)

  
  The Java Virtual Machine Specification
Virtual Machine Specification, Second Edition is now available.
In The Java Virtual Machine Specification, Second Edition, Sun's designers of the Java virtual machine provide comprehensive coverage of the Java virtual machine class file format and instruction set.
In addition, the book contains directions for compiling the virtual machine with numerous practical examples to clarify how it operates in practice.
java.sun.com /docs/books/vmspec   (166 words)

  
  What is virtual machine? - a definition from Whatis.com
The JVM is a virtual machine in that it executes code compiled specifically for it – known as bytecode – and abstracts use of resources for this bytecode.
A user interacting with a virtualized server can view the server as a physical machine, in the sense that the user would see access to machines resources like hard disks, RAM, processors and Ethernet connections.
The virtual machine idea is itself one of the most elegant in the history of technology and is a crucial step in the evolution of ideas about software.
searchservervirtualization.techtarget.com /sDefinition/0,,sid94_gci213305,00.html   (0 words)

  
  Virtual machine - Wikipedia, the free encyclopedia
Because versions of the virtual machine are written for various computer platforms, any application written for the virtual machine can be operated on any of the platforms, instead of having to produce separate versions of the application for each computer and operating system.
The term virtual machine is now also used to refer to the environment created by an emulator, where software is used to emulate an operating system for the end user.
Virtual machines can also perform the role of an emulator, allowing software applcations and operating systems written for another computer processor architecture to be run.
en.wikipedia.org /wiki/Virtual_machine   (1120 words)

  
 Parrot virtual machine - Wikipedia, the free encyclopedia
Parrot is a register-based virtual machine being developed using the C programming language and intended to run dynamic languages efficiently.
Current popular virtual machines such as the Java virtual machine and the Common Language Runtime have been designed for statically typed languages, while the languages targeted by Parrot are dynamically typed.
Virtual machines like the Java virtual machine and the current Perl 5 virtual machine are also stack based.
en.wikipedia.org /wiki/Parrot_virtual_machine   (629 words)

  
 virtual machine - a Whatis.com definition
The Java virtual machine specification defines an abstract rather than a real "machine" (or processor) and specifies an instruction set, a set of registers, a stack, a "garbage heap," and a method area.
A Java virtual machine can either interpret the bytecode one instruction at a time (mapping it to a real microprocessor instruction) or the bytecode can be compiled further for the real microprocessor using what is called a just-in-time compiler.
The virtual machine idea is itself one of the most elegant in the history of technology and is a crucial step in the evolution of ideas about software.
searchsmb.techtarget.com /sDefinition/0,,sid44_gci213305,00.html   (507 words)

  
 Java virtual machine - Wikipedia, the free encyclopedia
A Java Virtual Machine or JVM, originally developed by Sun Microsystems, is a virtual machine that executes Java bytecode.
A virtual machine architecture allows very fine-grained control over the actions that code within the machine is permitted to take.
The lean, mean, virtual machine - An introduction to the basic structure and functionality of the Java Virtual Machine
en.wikipedia.org /wiki/Java_virtual_machine   (795 words)

  
 The Soul of a Virtual Machine   (Site not responding. Last check: )
The virtual machine team is "pedal to the metal" developing and testing an update for Virtual Machine Additions.
This white paper explains the differences between Virtual PC and Virtual Server and discusses the scenarios in which it is appropriate to use one or the other.
The developer connects the virtual machine to a debugger though a named pipe (a virtual serial port) and debugs the issue in the development environment.
blogs.technet.com /megand/default.aspx   (2927 words)

  
 Java Virtual Machine Download Links - Download JVMs
The Microsoft Java Virtual Machine is no longer available from Microsoft directly due to legal wrangling with SUN, however it still can be downloaded...
Once the file is on your harddrive, execute it and thus load the Virtual Machine.
Once you have this installed and have re-booted your machine, then you need to go to the MS update site and install all the updates you do not currently have.
java-virtual-machine.net /download.html   (389 words)

  
 What is virtual machine? - A Word Definition From the Webopedia Computer Dictionary
For example, Java applets run in a Java virtual machine (VM) that has no access to the host operating system.
As virtualization — or at least talk of it — spreads through the enterprise, the word hypervisor is popping up everywhere.
To understand what a hypervisor is, you first have to have a basic understanding of system virtualization.
www.webopedia.com /TERM/v/virtual_machine.html   (0 words)

  
 The Symbolics Virtual Lisp Machine
The performance of the first version of the Virtual Lisp Machine running on a DEC Alpha AXP 500 is very competitive with the performance of Symbolics' most advanced custom hardware.
One of the features of Lisp Machines (one of the technologies that allowed its creation) is the use of microcode to implement complex instructions closely tuned to the language-level concepts of Lisp.
In the '70s, when the Lisp Machine was born, compiler technology was poor and microcoding simplified the compiler writer's task while maintaining performance.
pt.withy.org /publications/VLM.html   (1698 words)

  
 Java Virtual Machine Profiler Interface
The Java virtual machine is a multithreaded and garbage-collected execution environment that generates various events of interest for the profiler.
On the other hand, virtual machine implementations from different vendors may be different enough that it is impossible to expose all the interesting events through a general-purpose interface.
A straightforward solution is to require the virtual machine to record all profiling events in a trace file, whether or not these events are enabled by the profiler agent.
www.research.ibm.com /journal/sj/391/viswanathan.html   (6299 words)

  
 SQLite Virtual Machine Opcodes
There are substantial changes in the virtual machine for version 2.0 and the document has not been updated.
When the virtual machine halts, all memory that it allocated is released and all database cursors it may have had open are closed.
The only way for the virtual machine to interact with a database file is through a cursor.
www.sqlite.org /opcode.html   (8286 words)

  
 Virtual Machine
Virtual Machine (VM) is a system that enables multiple operating systems concurrently run on a single physical server, providing for much more effective utilization of the underlying hardware.
In a virtual machine, the central processor chips isolate an area of memory from the rest of the system and the operating systems and applications run in a “protected mode” environment.
The Unix virtual machine model and the OSI virtual machine model map some of the instructions directly, while some others are calls to the operating system functions directly.
www.networkdictionary.com /software/vm.php   (485 words)

  
 [No title]
A recent film ignited a new generation of armchair epistemologists when it proposed that we could be living inside an elaborate computer simulation.
Virtual machine software can fool an operating system into thinking it's running on its own hardware, when in reality it's simply mooching off unused CPU cycles and RAM.
Since VMs can use virtual partitions (a partition that lives inside a file of dynamic or fixed size), you don't have to worry about reclaiming any hard drive space lost to experimentation.
arstechnica.com /reviews/apps/vm.ars/1   (906 words)

  
 The Virtual Machine   (Site not responding. Last check: )
Since the early 60’s machines have generally had features, such as a privilege mode which, together with a memory map, allows an operating system to control applications and thus protect itself and protect one application from another.
A virtual machine might have several decks “at hand” which could be placed in the card reader or passed to other virtual machines.
This virtual isolation was used many ways, such as testing new releases of operating systems, debugging privileged code, and sometimes to provide the isolation required by special security needs, all of this while the real machine continued mission critical work within another virtual machine.
cap-lore.com /CP.html   (1794 words)

  
 Virtual ][
Virtual ][ is a program that emulates the vintage Apple ][ computer on your Macintosh.
Virtual ][ lets you play the old Apple games, because it supports all graphics modes, lets you control the game paddles with a USB game pad or mouse and emulates the internal speaker.
When you want to temporarily interrupt gameplay, Virtual ][ allows you to save the entire virtual machine, and continue later on from where you left off.
www.xs4all.nl /~gp/VirtualII   (387 words)

  
 Microsoft Virtual PC 2004   (Site not responding. Last check: )
Virtual PC is a powerful software virtualization solution that allows you to run multiple PC-based operating systems simultaneously on one workstation, providing a safety net to maintain compatibility with legacy applications while you migrate to a new operating system.
Haufe Mediengruppe uses Virtual PC to run multiple operating systems on a single desktop system, gaining a faster, more cost-efficient, and simplified means for editors to test software referenced in technology-related publications.
Connectix Virtual PC for Windows 5 is a powerful software virtualization solution that allows you to run multiple PC-based operating systems and applications on a single workstation, resulting in reduced hardware costs and improved productivity.
www.microsoft.com /windows/virtualpc/default.mspx   (324 words)

  
 Java virtual machine Info - Encyclopedia WikiWhat.com   (Site not responding. Last check: )
The Java virtual machine or JVM is a virtual machine that runs Java byte code, the code produced by a Java compiler or compilers from other languages which produce this code.
Programs written in Java are compiled into a standardized portable binary format, which typically comes in the form of files with the.class extension.
The specification for the JVM is published in book form and HTML and anybody is allowed to write an implementation of it.
wikiwhat.com /encyclopedia/j/ja/java_virtual_machine.html   (304 words)

  
 Computer Laboratory - Xen virtual machine monitor
Modern computers are sufficiently powerful to use virtualization to present the illusion of many smaller virtual machines (VMs), each running a separate operating system instance.
Firstly, virtual machines must be isolated from one another: it is not acceptable for the execution of one to adversely affect the performance of another.
Xen is a virtual machine monitor for x86 that supports execution of multiple guest operating systems with unprecedented levels of
www.cl.cam.ac.uk /Research/SRG/netos/xen   (346 words)

  
 Virtual Turing Machine
He also invented a concept of a type of computer, called a "Turing Machine." Theoretically, a Turing machine is just as powerful as any other computer.
Conceptually, a Turing Machine has a finite set of states, a finite alphabet (that has a blank symbol), and a finite set of instructions.
That means the machine will halt no matter what value it encounters once it's in state 's1'.
www.nmia.com /~soki/turing   (729 words)

  
 The lean, mean, virtual machine
A key component of Java is the Java Virtual Machine -- a virtual computer, typically implemented in software on top of a "real" hardware platform and operating system, that runs compiled Java programs.
The JVM is "virtual" because it is generally implemented in software on top of a "real" hardware platform and operating system.
The "virtual hardware" of the Java Virtual Machine can be divided into four basic parts: the registers, the stack, the garbage-collected heap, and the method area.
www.javaworld.com /javaworld/jw-06-1996/jw-06-vm.html   (929 words)

  
 Agent iSolutions - Products - Brahms Virtual Machine   (Site not responding. Last check: )
The virtual machine has a Java Application Programming Interface (JAPI) that allows for developers to develop their own virtual machine services, Java-based agents and Java-based agent activities that interact with the virtual machine and the agents managed by the virtual machine.
The JAPI can be used to register for virtual machine events and handle those events for different purposes and can be used to interface external systems with Brahms agents.
The virtual machine also includes an event service that displays all events generated by the virtual machine in a readable format in an event information file.
www.agentisolutions.com /products/vm.htm   (275 words)

  
 Virtual Turing Machine 2.02   (Site not responding. Last check: )
A Turing machine is theoretical computer consisting of a finite set of internal states, a finite alphabet that includes a blank symbol, and a finite set of instructions.
When the machine does not have an instruction for a given internal state and cell value, it will halt.
The Turing machine will start at the leftmost non-blank cell on the tape (if there are no non-blank cells in the tape, the VTM will start in the middle of the tape).
infohost.nmt.edu /~prcm/turing   (754 words)

  
 Reference.com/Encyclopedia/Virtual machine   (Site not responding. Last check: )
Notably, there is no execution mode where all privileged machine instructions always trap, which would allow per-instruction virtualization.
Perl (the virtual machine of Perl 5 is not separately accessible)
Parrot (a virtual machine which is currently developed for interpreted dynamic languages (Perl 6, Ruby,...).
www.reference.com /browse/wiki/Virtual_machine   (957 words)

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