Parallels Desktop for Mac 3.0, Box, ITA, UPG Uživatelská příručka stáhnout pdf (Strana 164)

164 Parallels Desktop for Mac User Guide

Advanced Options tab contains various options that affect the performance of the virtual

machine.

Emulation Flags:

 Acceleration level. At each acceleration level, certain performance optimization techniques

(specific to the guest OS) are enabled. We recommend selecting the High level. If you

notice incorrect guest operating system behavior while running with high acceleration, shut

down the OS and lower the acceleration level. Note that without acceleration at all

(Disabled level) any virtual machine runs slowly.

 Enable Intel VT-x Support option is available for changing if you have an Intel processor with

VT-x in your Mac. By default, VT-x support is enabled. See Intel Virtualization Technology

(VT-x) Support (page 14) to learn about VT-x support in Parallels Desktop. If you are

running a guest OS while VT-x support is enabled, it is indicated in the About Parallels

Desktop window (see the More Information (page 51) section).

Virtual Machine Performance:

 Virtual machine. Choose this option to significantly increase the speed of virtual machine

operations maybe at price of slowing down your Mac OS X applications.

 Mac OS X Applications. Choose this option to provide better performance of Mac OS X.

Undo disks

 The Undo disks option allows you to define the virtual machine disks as undo disks. The

current version of Parallels Desktop allows applying this option only to all disks of the

virtual machine at once.

It means that the initial state of the virtual machine disks will be saved at the machine's

startup, and while you work with the virtual machine, all changes are being written to a

temporary file. When you turn off the virtual machine, the changes will be applied to its

hard disks, or discarded, or you will be prompted to decide whether to apply or discard the

changes - it depends on the action you choose.

 If you selected the Undo disks option, choose one of the actions be performed on the virtual

machine closing: Discard Changes, Apply changes, Ask me what to do.

Note. 1. If you selected the Undo disks option for the virtual machine, you cannot create

snapshots for this virtual machine.

2. The option cannot be set for the virtual machines that use a Boot Camp partition.

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Parallels Desktop for Mac 3.0, Box, ITA, UPG Uživatelská příručka Strana 164