In order to run VirtualBox on your machine, you need: Reasonably powerful x86 hardware. Any recent Intel or AMD processor should do. Prerequisites on Mac OS X 10.10.x (Yosemite) or later running on Intel hardware (PowerPC hardware is not supported nor is building an X11 variant). Xcode matching your Mac OS X version (http://developer.apple.com/tools/download/).
Oracle VDI bundles and supports a specific Oracle VM VirtualBox release. See Section 4.1.2, “System Requirements for Oracle VM VirtualBox”.
The VirtualBox provides the following features.
Shared Memory
Shared Memory (also known as memory ballooning) is a feature that enables more desktops to run on VirtualBox hosts. By specifying an amount of memory to be shared between desktops, the VirtualBox host's memory can be automatically redistributed between desktops as required. The Shared Memory feature can be activated on a per-pool basis on the Pool category, Settings tab by specifying a value greater than 0% (up to 75%).
The memory sharing percentage is the amount of memory that can be used for other desktops if a desktop does not require the full amount of memory for itself. For instance, if the desktop memory size is 1 GB and memory sharing is set to 40%, the desktop will initially have around 600 MB of real memory. The other 400 MB will be made available to the desktop on demand.
Oracle VDI constantly monitors desktops with memory sharing enabled to ensure they don't run out of memory. If a desktop's free memory drops below 64 MB more usable memory will be provided. If a desktop has excessive amounts of free memory, some memory will be gradually taken away until the memory sharing percentage is reached. The changes to desktop memory will not be apparent to the guest OS.
Memory Paging
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Memory Paging (also known as de-duplication of memory) is a feature that enables more desktops to run on VirtualBox hosts. If several desktops have identical content in memory, pages will be used to consume real memory on the hypervisor only once. The desktops will reference the page and do not need physical memory for identical pages any more.
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The Memory Paging feature can be activated on a per-pool basis on the Pool category, Settings tab.