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The client OS 155 may be different (such as Microsoft Windows, Linux, Mac OS) on each VM 150 depending on the needs of each user of the particular VM 150。 Furthermore, the VM 150 may be similar to a personal computer or also a mobile device, such as a notebook or smartphone。 Therefore, the hardware needed for the working of each VM 150 may also be different。 By hardware is meant the group of allocated resources (memory volume, hard disk size, number of processor kernels, number of processors, and so on) of the host machine 110。

In one aspect, to enable a simultaneous working of the VMs 150 the host machine 110 includes a hypervisor 130. The hypervisor 130 is designed to provide isolation of one VM 150 from another VM 150, control (regulation) of the computing resources of the host machine 110 and allocation of the given computing resources among the VMs 150. Regulation of the computing resources makes possible a working of VMs 150 without freezing or delays, since the VMs 150 utilize the identical computing resources of the host machine 110. For example, in the case of a simultaneous working of several VMs 150 with a data storage medium (such as a hard disk drive (HDD)), it is necessary to form a queue for access to the hypervisor 130. This is because, even though special sectors on the hard disk have been allocated to each VM 150, the data input/output operations occur using the identical element (such as a disk head).

Yet another example of the regulation of the workload is the working of the virtual machines 150 with the processor of the host machine 110. When the virtual machines are launched, each VM 150 may be assigned a percentage utilization of the capabilities of the physical process of the host machine 110, for example, 25% for one VM, and 50% for another VM. The hypervisor 130 is necessary to regulate the processor workload of each VM 150 when they are jointly working. For example, if the first VM loads the processor by 10%, then the second VM has the ability to load it up to 40%. The principle for regulating the processor resources of the host machine 110 among the VMs may be different and may depend on various criteria, for example, the prioritization of the VM or the initial settings of each VM.

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