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By using this site, you agree to the Terms of Use and Privacy Policy. But you are talking about Workstation virtualization not a bare metal Hypervisor which has a fraction of the overheads compared to virtualizing on Windows. Sun Microsystems acquired by Oracle Corp , A summary of the procedures is listed below:. You even forgot a big one: To avoid losing the current state when restoring a snapshot, you can create a new snapshot before the restore.

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Installing Debian Linux in a VirtualBox Virtual Machine

Process virtual machines arose originally as abstract platforms for an intermediate language used as the intermediate representation of a program by a compiler ; early examples date to around An early example was the O-code machine , a virtual machine that executes O-code object code emitted by the front end of the BCPL compiler. This abstraction allowed the compiler to be easily ported to a new architecture by implementing a new back end that took the existing O-code and compiled it to machine code for the underlying physical machine.

The Euler language used a similar design, with the intermediate language named P portable. This has been influential, and virtual machines in this sense have been often generally called p-code machines. In addition to being an intermediate language, Pascal p-code was also executed directly by an interpreter implementing the virtual machine, notably in UCSD Pascal ; this influenced later interpreters, notably the Java virtual machine JVM.

Process virtual machines were a popular approach to implementing early microcomputer software, including Tiny BASIC and adventure games, from one-off implementations such as Pyramid to a general-purpose engine like Infocom 's z-machine , which Graham Nelson argues is "possibly the most portable virtual machine ever created".

These techniques proved commercially successful in in the HotSpot Java virtual machine. In full virtualization, the virtual machine simulates enough hardware to allow an unmodified "guest" OS one designed for the same instruction set to be run in isolation. In hardware-assisted virtualization, the hardware provides architectural support that facilitates building a virtual machine monitor and allows guest OSes to be run in isolation.

In and , Intel and AMD provided additional hardware to support virtualization. In , first-generation and bit x86 hardware support was found to rarely offer performance advantages over software virtualization. In operating-system-level virtualization, a physical server is virtualized at the operating system level, enabling multiple isolated and secure virtualized servers to run on a single physical server.

The "guest" operating system environments share the same running instance of the operating system as the host system. Thus, the same operating system kernel is also used to implement the "guest" environments, and applications running in a given "guest" environment view it as a stand-alone system. From Wikipedia, the free encyclopedia.

Hardware virtualization and Comparison of platform virtualization software. Application virtualization , Runtime system , and Comparison of application virtualization software. This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. July Learn how and when to remove this template message.

Communications of the ACM. Archived from the original on Retrieved 23 September Some people use that capability to set up a separate virtual machine running Windows on a Mac, giving them access to the full range of applications available for both platforms.

Archived PDF from the original on Shaping an Industry and Its Technology. IBM's and Early Systems. The Language and its Implementation. Addison-Wesley Series in Computer Science. Peter; Schiffman, Allan M. Because it's my daily business I might point out the 4 following parts which made up the "performance" CPU load This should be comparable, meaning a task taking ms on bare metal will execute in ms process time and probably ms of clock time in an idle VM environment on the same hardware some details later.

And the home users perspective Andreas Goretzky 2 2. We like good answers to timeless questions. Welcome to Server Fault! But that is not the question. It depends on so many factors thatnobody can answer your question. It depends on which hypervisor you have, the server spec, storage and most importantly what else is going on withe the host at the time in question.

Actually it does not. Natually if you do a lot ot things, the physical machine is shared. But the overhead of the hyper-visor is pretty constant by now, given hardware virtialization. Anturally if you start loading multiple VM's the resulting available powe is shared, but it is - in total - still only slightly less than what the server has. Two pieces of software runing on two VM on the same server won't communicate faster than two softwares under the same OS on one bare metal server.

It's not always about consolidation and cost savings. A hypervisor is a product with many features, many of which have the potential to add business value independently of the reasons that most people virtualize. Consolidation and cost savings may be part of that business value, or they may not.

Snapshots, live migration, Storage vMotion, and hardware abstraction may all be part of the business IT strategy. You even forgot a big one: Here's what I've seen: The physical machine is better at instantiating classes which translates to allocating memory at the system level - this makes sense to me because physical machines do this through memory management hardware and VMs do this through software with partial hardware assist On the VM, the app spent a significant amount of time in its constructors where the memory is allocated and nothing else is done , on the physical machine, the constructors weren't even included in the top When you are in the middle of a method, the two are about equivalent - this is probably how most of the benchmarks are constructed that show the two "being the same" When you access a network controller, the physical beats out the VM a little - again, the physical doesn't have very much sitting in between the.

NET process and the hardware. VM adds adds other "stuff" that each transaction needs to travel through. Really, the same thing applied to disk access the SQL Server was on another machine - the difference is very small, but when you add them all up, it is noticeable. This could have been caused by the slower network access or by a slower disk access.

This is what I was looking for. But the feel of the VM is that disk access taxes the VM. Please cite the conclusions in your answers or this is little more than SPAM for the provided link. Ideally Virtual PC performance is at: And those numbers come from Sorry to disagree with TomTom. The main problem isn't that much the CPU load but the physical memory lack. Now, you'll start different apps within that virtual machine.

Just my 2 cents. Will there still be some noticable slowdown? How would Win7 x64 need 1,5 GB or any cpu time at all when idle? But you are talking about Workstation virtualization not a bare metal Hypervisor which has a fraction of the overheads compared to virtualizing on Windows. Ubuntu cloud might not quite be a bare metal hypervisor but it hardly uses the reosurces of Windows - it runs on Ubuntu Server which doesn't have a GUI for instance.

Secondly you're talking about running high loads on the host; of course that's going to have an impact on the guest VM. More like MB in my experience Take a look at this picture theliberated7dwarfs. Zubair 2, 9 32 YOu seem to run really crap virtualization technique. Naturally this means running only one virtual machine, or accepting that the performance is splitted - but the overhead of virtualization is really low.

It can also be about ease of maintenance - moving a VM to new hardwar easy, a physical machine may be more complicated. I would like to believe you but Microsoft of course have an interest in telling everyonr that their hypervisor is super fast.

Have you actually benchmarked it yourself? I am no idiot - I was running tests before. I have been moving a lot of stuff over to VM's and barely run anything physical these days. I did a lto of benchmarking myself. What does that mean?

Secondly, it extends the capabilities of your existing computer so that it can run multiple operating systems inside multiple virtual machines at the same time. So, for example, you can run Windows and Linux on your Mac, run Windows Server on your Linux server, run Linux on your Windows PC, and so on, all alongside your existing applications.

You can install and run as many virtual machines as you like -- the only practical limits are disk space and memory. VirtualBox is deceptively simple yet also very powerful. It can run everywhere from small embedded systems or desktop class machines all the way up to datacenter deployments and even Cloud environments. The following screenshot shows you how VirtualBox, installed on a Mac computer, is running Windows 8 in a virtual machine window:.

In this User Manual, we'll begin simply with a quick introduction to virtualization and how to get your first virtual machine running with the easy-to-use VirtualBox graphical user interface. Subsequent chapters will go into much more detail covering more powerful tools and features, but fortunately, it is not necessary to read the entire User Manual before you can use VirtualBox. Running multiple operating systems simultaneously. VirtualBox allows you to run more than one operating system at a time.

This way, you can run software written for one operating system on another for example, Windows software on Linux or a Mac without having to reboot to use it. Software vendors can use virtual machines to ship entire software configurations. For example, installing a complete mail server solution on a real machine can be a tedious task. With VirtualBox, such a complex setup then often called an "appliance" can be packed into a virtual machine.

Installing and running a mail server becomes as easy as importing such an appliance into VirtualBox. Testing and disaster recovery. Once installed, a virtual machine and its virtual hard disks can be considered a "container" that can be arbitrarily frozen, woken up, copied, backed up, and transported between hosts.

On top of that, with the use of another VirtualBox feature called "snapshots", one can save a particular state of a virtual machine and revert back to that state, if necessary.

This way, one can freely experiment with a computing environment. If something goes wrong e. Any number of snapshots can be created, allowing you to travel back and forward in virtual machine time.

You can delete snapshots while a VM is running to reclaim disk space. Virtualization can significantly reduce hardware and electricity costs. Most of the time, computers today only use a fraction of their potential power and run with low average system loads. A lot of hardware resources as well as electricity is thereby wasted.

So, instead of running many such physical computers that are only partially used, one can pack many virtual machines onto a few powerful hosts and balance the loads between them. When dealing with virtualization and also for understanding the following chapters of this documentation , it helps to acquaint oneself with a bit of crucial terminology, especially the following terms:.

This is the operating system of the physical computer on which VirtualBox was installed. Most of the time, this User Manual discusses all VirtualBox versions together.

There may be platform-specific differences which we will point out where appropriate. This is the operating system that is running inside the virtual machine.

So while your favorite operating system may run as a guest, we officially support and optimize for a select few which, however, include the most common ones.

This is the special environment that VirtualBox creates for your guest operating system while it is running. In other words, you run your guest operating system "in" a VM. Normally, a VM will be shown as a window on your computer's desktop, but depending on which of the various frontends of VirtualBox you use, it can be displayed in full screen mode or remotely on another computer.

In a more abstract way, internally, VirtualBox thinks of a VM as a set of parameters that determine its behavior. They include hardware settings how much memory the VM should have, what hard disks VirtualBox should virtualize through which container files, what CDs are mounted etc. In other words, a VM is also what you can see in its settings dialog. This refers to special software packages which are shipped with VirtualBox but designed to be installed inside a VM to improve performance of the guest OS and to add extra features.

VirtualBox is a so-called "hosted" hypervisor sometimes referred to as a "type 2" hypervisor. Whereas a "bare-metal" or "type 1" hypervisor would run directly on the hardware, VirtualBox requires an existing operating system to be installed. It can thus run alongside existing applications on that host.

To a very large degree, VirtualBox is functionally identical on all of the host platforms, and the same file and image formats are used. This allows you to run virtual machines created on one host on another host with a different host operating system; for example, you can create a virtual machine on Windows and then run it under Linux.

You can even import OVFs that were created with a different virtualization software. No hardware virtualization required. As opposed to many other virtualization solutions, you can therefore use VirtualBox even on older hardware where these features are not present.

The VirtualBox Guest Additions are software packages which can be installed inside of supported guest systems to improve their performance and to provide additional integration and communication with the host system. After installing the Guest Additions, a virtual machine will support automatic adjustment of video resolutions, seamless windows, accelerated 3D graphics and more.

In particular, Guest Additions provide for "shared folders", which let you access files from the host system from within a guest machine. Among others, VirtualBox supports:. VirtualBox can present up to 32 virtual CPUs to each virtual machine, irrespective of how many CPU cores are physically present on your host. VirtualBox implements a virtual USB controller and allows you to connect arbitrary USB devices to your virtual machines without having to install device-specific drivers on the host.

USB support is not limited to certain device categories. VirtualBox virtualizes a vast array of virtual devices, among them many devices that are typically provided by other virtualization platforms.

This eases cloning of PC images from real machines and importing of third-party virtual machines into VirtualBox. This eases cloning of PC images from real machines or third-party virtual machines into VirtualBox. For mobile systems running on battery, the guest can thus enable energy saving and notify the user of the remaining power e. VirtualBox virtual machines support screen resolutions many times that of a physical screen, allowing them to be spread over a large number of screens attached to the host system.

This unique feature allows you to connect a virtual machine directly to an iSCSI storage server without going through the host system. The VM accesses the iSCSI target directly without the extra overhead that is required for virtualizing hard disks in container files. VirtualBox can save arbitrary snapshots of the state of the virtual machine. You can go back in time and revert the virtual machine to any such snapshot and start an alternative VM configuration from there, effectively creating a whole snapshot tree.

You can create and delete snapshots while the virtual machine is running. VirtualBox provides a groups feature that enables the user to organize and control virtual machines collectively, as well as individually. In addition to basic groups, it is also possible for any VM to be in more than one group, and for groups to be nested in a hierarchy -- i. In general, the operations that can be performed on groups are the same as those that can be applied to individual VMs i.

Clean architecture; unprecedented modularity. VirtualBox has an extremely modular design with well-defined internal programming interfaces and a clean separation of client and server code. This makes it easy to control it from several interfaces at once: Due to its modular architecture, VirtualBox can also expose its full functionality and configurability through a comprehensive software development kit SDK , which allows for integrating every aspect of VirtualBox with other software systems.

As a result, it works with guest operating systems other than Windows even in text mode and does not require application support in the virtual machine either. Mac OS X hosts bit: Linux hosts bit and bit [ 3 ]. Among others, this includes:. It should be possible to use VirtualBox on most systems based on Linux kernel 2.

However, the formally tested and supported Linux distributions are those for which we offer a dedicated package.

Note that starting with VirtualBox 2. Note that the above list is informal. Oracle support for customers who have a support contract is limited to a subset of the listed host operating systems.

Also, any feature which is marked as experimental is not supported. Feedback and suggestions about such features are welcome. VirtualBox comes in many different packages, and installation depends on your host operating system. If you have installed software before, installation should be straightforward: Additional extension packs can be downloaded which extend the functionality of the VirtualBox base package.

Currently, Oracle provides the one extension pack, which can be found at http: The virtual USB 2. The virtual USB 3. VirtualBox extension packages have a. To install an extension, simply double-click on the package file and a Network Operations Manager window will appear, guiding you through the required steps. To view the extension packs that are currently installed, please start the VirtualBox Manager see the next section.

From the "File" menu, please select "Preferences". In the window that shows up, go to the "Extensions" category which shows you the extensions which are currently installed and allows you to remove a package or add a new one. Alternatively you can use VBoxManage on the command line: On a Windows host, in the standard "Programs" menu, click on the item in the "VirtualBox" group.

You may want to drag this item onto your Dock. On a Linux or Solaris host, depending on your desktop environment, a "VirtualBox" item may have been placed in either the "System" or "System Tools" group of your "Applications" menu. Alternatively, you can type VirtualBox in a terminal.

This window is called the "VirtualBox Manager". On the left, you can see a pane that will later list all your virtual machines. Since you have not created any, the list is empty. A row of buttons above it allows you to create new VMs and work on existing VMs, once you have some. The pane on the right displays the properties of the virtual machine currently selected, if any.

Again, since you don't have any machines yet, the pane displays a welcome message. To give you an idea what VirtualBox might look like later, after you have created many machines, here's another example:.

Click on the "New" button at the top of the VirtualBox Manager window. A wizard will pop up to guide you through setting up a new virtual machine VM:. On the following pages, the wizard will ask you for the bare minimum of information that is needed to create a VM, in particular:. For "Operating System Type", select the operating system that you want to install later.

The supported operating systems are grouped; if you want to install something very unusual that is not listed, select "Other". Depending on your selection, VirtualBox will enable or disable certain VM settings that your guest operating system may require.

It is therefore recommended to always set it to the correct value. On the next page, select the memory RAM that VirtualBox should allocate every time the virtual machine is started. The amount of memory given here will be taken away from your host machine and presented to the guest operating system, which will report this size as the virtual computer's installed RAM.

Choose this setting carefully! The memory you give to the VM will not be available to your host OS while the VM is running, so do not specify more than you can spare. If you run two VMs at the same time, even more memory will be allocated for the second VM which may not even be able to start if that memory is not available. On the other hand, you should specify as much as your guest OS and your applications will require to run properly. Of course, if you want to run graphics-intensive applications in your VM, you may require even more RAM.

But, in any case, make sure you always have at least to MB of RAM left on your host operating system. Otherwise you may cause your host OS to excessively swap out memory to your hard disk, effectively bringing your host system to a standstill. As with the other settings, you can change this setting later, after you have created the VM. Next, you must specify a virtual hard disk for your VM. This file represents an entire hard disk then, so you can even copy it to another host and use it with another VirtualBox installation.

To create a new, empty virtual hard disk, press the "New" button.

Secure Boot setting in Hyper-V Manager

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I have been playing with virtual machines latley, and wondered if I could run a virtual machine inside a virtual machine? Is it possible? Is it practical? In computing, a virtual machine (VM) is an emulation of a computer system. Virtual machines are based on computer architectures and provide functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination. There are different kinds of virtual machines, each with different functions. JVM specification. The Java virtual machine is an abstract (virtual) computer defined by a specification. The garbage-collection algorithm used and any internal optimization of the Java virtual machine instructions (their translation into machine code) are not specified.